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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Atuchin V. V., Zaitsev A. I., Molokeev M. S., Aleksandrovsky A. S., Kuzubov A. A., Ignatova N. Y., Kesler V. G.
Заглавие : Electronic structure of α-SrB[[d]]4[[/d]]O[[d]]7[[/d]]: experiment and theory
Место публикации : J. Phys.: Condens. Matter. - 2013. - Vol. 25, no. 8. - Ст.085503. - DOI 10.1088/0953-8984/25/8/085503
Аннотация: The investigation of valence band structure and electronic parameters of constituent element core levels of α-SrB4O7 has been carried out with x-ray photoemission spectroscopy. Optical-quality crystal α-SrB4O7 has been grown by the Czochralski method. Detailed photoemission spectra of the element core levels have been recorded from the powder sample under excitation by nonmonochromatic Al Kα radiation (1486.6 eV). The band structure of α-SrB4O7 has been calculated by ab initio methods and compared to XPS measurements. It has been found that the band structure of α-SrB4O7 is weakly dependent on the Sr-related states.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Бедарев В. А., Пащенко М. И., Кобец М. И., Дергачев К. Г., Пащенко В. А., Блудов А. Н., Хацько Е. Н., Гнатченко С. Л., Безматерных, Леонард Николаевич, Темеров, Владислав Леонидович
Заглавие : Магниторезонансные свойства антиферромагнетика TbFe3(BO3)4 при низких температурах
Место публикации : Low Temperature Physics. - 2013. - Vol. 39, No. 2. - P.219-224; \b Физика низких температур
Аннотация: Исследованы магнитный резонанс и полевая зависимость намагниченности монокристалла TbFe3(BO3)4 при температурах от 2 до 13 К и частотах от 18 до 142 ГГц. В спектре ЭПР обнаружены две пары линий различной интенсивности. Указанные линии могут быть связаны с двумя типами центров —ионами Tb3+ , в окружении которых находятся ростовые примеси Bi и Mo. Определены начальные расщепления нижайших квазидублетов таких ионов Tb3+ кристаллическим полем и обменным полем, действующим на ионы редкой земли со стороны подрешеток железа. Проведена оценка количества указанных центров.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G.
Заглавие : Analysis of the sequence of insulator-metal phase transitions at high pressure in systems with spin crossovers
Место публикации : J. Experim. Theor. Phys. - 2013. - Vol. 116, Is. 1. - P.123-127. - DOI 10.1134/S1063776113010111
Примечания : Cited References: 18. - This study was supported in part by the Russian Foundation for Basic Research (project. no. 100200251), the Presidential Program of Support for Lead ing Scientific Schools in Russia (project no. NSh 1044.2012.2), the Presidium of the Russian Academy of Sciences (program no. 2.16), and the Siberian Branch of the Russian Academy of Sciences (program nos. 96 and 97), and the Siberian Federal University (project no. F11)
Аннотация: Possible variants of the Mott–Hubbard phase transitions at high pressure in systems with spin cross-overs are considered. Owing to the universal character of the dependence of the effective Hubbard parameterUeff(dn) on the average number of d electrons, which is determined by the presence of spin crossovers, cascadesof insulator–metal–insulator phase transitions in systems with d3, d6, and d8 configurations become possible.Moreover, the systems with d6 configuration can exhibit transitions from a metal in the absence of external pres-sure to an insulator at high pressure.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sidorov K. A., Ovchinnikov S. G., Tikhonov N. V.
Заглавие : Simple method for exact calculation of thermodynamic properties of the 1D Hubbard model with infinite repulsion
Место публикации : J. Experim. Theor. Phys. - 2013. - Vol. 116, Is. 2. - P.330-337. - DOI 10.1134/S1063776113020167
Аннотация: It is shown that the canonical partition function in the 1D Hubbard model with U = ∞ in the near-est neighbor approximation is determined by the product of canonical partition functions of spinons andholons. In this approximation, the concentration and temperature dependences of the free and internal ener gies, as well as of the chemical potential, entropy, and heat capacity, are calculated for electron concentrations of 0 ≤ n[[d]]e[[/d]] ˂ 1
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkov N. V., Mikhashenok N. V., Sablina K. A., Bayukov O. A., Gorev M. V., Balaev A. D., Pankrats A. I., Tugarinov V. I., Velikanov D. A., Molokeev M. S., Popkov S. I.
Заглавие : Magnetic phase diagram of the olivine-type Mn2GeO4 single crystal estimated from magnetic, resonance and thermodynamic properties
Место публикации : J. Phys.: Condens. Matter. - 2013. - Vol. 25, No. 13. - Ст.136003. - P. - DOI 10.1088/0953-8984/25/13/136003
Аннотация: Mn2GeO4 single crystals with the olivine structure grown by the modified flux method have been investigated. Pronounced magnetic phase transitions at T1 = 47.7 K, T2 = 17 K and T3 = 5.5 K, with T2 being dependent on an applied magnetic field, have been found. Based on the data of magnetic, resonance and temperature measurements, the entire phase diagram of Mn2GeO4 has been built. Mn2GeO4 is shown to be a material with a complex magnetic structure consisting of two magnetic subsystems.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bogdanov E. V., Pogoreltsev E. I., Mel'nikova S. V., Gorev M. V., Flerov I. N., Molokeev M. S., Kartashev A. V., Kocharova A. G., Laptash N. M.
Заглавие : Investigation into phase diagrams of the fluorine–oxygen system: ferroelastic–antiferroelectric (NH4)2WO2F4–(NH4)2MoO2F4
Место публикации : Phys. Sol. St.: Pleiades Publishing, 2013. - Vol. 55, Is. 2. - P.409-418. - DOI 10.1134/S1063783413020042
Аннотация: Thermal, physical, structural, optical, and dielectric investigations have been performed for oxy- fluoride solid solutions (NH4)2W1–xMoxO2F4 (x = 0, 0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 1). The character of the influence of the chemical and hydrostatic pressures on the stability of the parent (space group Cmcm) and dis& torted ferroelastic and antiferroelectric phases has been determined by analyzing the temperature–pressure, unit cell volume–composition, and temperature–composition phase diagrams. The specific features of the nature and mechanism of the phase transitions have been discussed using the available data on the structural, entropy, and dielectric parameters.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pogoreltsev E. I., Mel'nikova S. V., Kartashev A. V., Molokeev M. S., Gorev M. V., Flerov I. N., Laptash N. M.
Заглавие : Ferroelastic phase transitions in (NH4)2TaF7
Место публикации : Phys. Sol. St.: Pleiades Publishing, 2013. - Vol. 55, Is. 3. - P.611-618. - DOI 10.1134/S1063783413030232
Аннотация: The heat capacity, unit cell parameters, permittivity, optical properties, and thermal expansion of the (NH4)2TaF7 compound with a seven coordinated anion polyhedron have been measured. It has been found that the compound undergoes two successive phase transitions with the symmetry change: tetragonal (T1 = 174 K) orthorhombic (T2 = 156 K) tetragonal. The ferroelastic nature of structural transformations has been established, and their entropy and susceptibility to hydrostatic pressure have been determined.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bondarev V. S., Kartashev A. V., Gorev M. V., Flerov I. N., Pogoreltsev E. I., Molokeev M. S., Raevskaya S. I., Suzdalev D. V., Raevskii I. P.
Заглавие : Thermal and physical properties of sodium niobate ceramics over a wide temperature range
Место публикации : Phys. Solid State. - 2013. - Vol. 55, Is. 4. - P.821-828. - DOI 10.1134/S1063783413040045
Аннотация: The temperature dependences of the heat capacity C p (T) and thermal expansion coefficient α(T) of NaNbO3 ceramic samples have been investigated in the temperature range from 2 to 800 K. In addition to the anomalies associated with the known phase transitions at temperatures T 6 ≈ 265 K, T 5 ≈ 638 K, T 4 ≈ 760 K, and T 3 ≈ 793 K, anomalies in the behavior of C p (T) and α(T) have been observed near T 5″ ≈ 500 K and T 5′ ≈ 600 K. It has been found that all the observed structural transformations, according to the values of the entropy change, are not related to the ordering of structural elements. It has been shown that, with an increase in the temperature, the unit cell volume during the phase transitions near 265, 515, 604, and 638 K decreases. The specific features of the transition to the phase R3c have been examined. Two possible scenarios of the sequence of phase transformations in the temperature range between T 5 and T 6 have been analyzed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Misjul S. V., Molokeev M. S., Olekhnovich N. M., Pushkarev A. V., Radyush J. V., Raevskii I. P., Safonov I. N.
Заглавие : Synthesis and crystal structure of the ordered perovskite Pb2FeSbO6
Место публикации : J. Sib. Fed. Univ. Math. Phys. - 2013. - Vol. 6, Is. 2. - P.227-236. - ISSN 1997-1397; Журн. СФУ. Сер. "Математика и физика"
Аннотация: This paper describes the synthesis of perovskite-like compound Pb2 FeSbO6 which undergoes a phase transition between 210–220 K. According to X-ray studies of the powder sample the structure of the initial cubic and the low-temperature tetragonal phases of Pb2 FeSbO6 were determined. The results obtained have been discussed using the group-theoretical analysis.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanova N. B., Platunov M. S., Knyazev Yu. V., Kazak N. V., Bezmaternykh L. N., Eremin E. V., Vasiliev A. D.
Заглавие : Spin-glass magnetic ordering in CoMgGaO2BO3 ludwigite
Место публикации : Low Temp. Phys.: American Institute of Physics, 2012. - Vol. 38, No. 2. - P.172-174. - ISSN 1063-777X, DOI 10.1063/1.3679627
Примечания : Cited References: 13. - This work was supported by the Russian Foundation for Basic Research (project No. 09-02-00171-a), the Federal Agency for Science and Innovation (Rosnauka) (project No. MK-5632.2010.2), the Physics Division of the Russian Academy of Sciences, the program "Strongly Correlated Electrons" (project 2.3.1).
Аннотация: The single crystal needle shape samples of diamagnetically diluted cobalt ludwigite CoMgGaO2BO3 have been grown by the flux method. The results of x-ray diffraction and both dc and ac magnetic measurements are presented. The unit cell volume undergoes a noticable growth under dilution from 328.31 Å3 for the parent compound Co3O2BO3 to 345.46 Å3 for CoMgGaO2BO3. The temperature of magnetic transition is considerably lower for the latter compound (25 K against 43 Kfor Co3O2BO3). The dc magnetization temperature dependencies undergo the splitting of field cooled and zero-field cooled regimes and the ac magnetic susceptibility temperature dependencies are frequency dependent pointing out a possible spin-glass freezing in the magnetic system.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tkachev E. N., Buryakov T. I., Kuznetsov V. L., Mosenkov S. I., Mazov I. N., Popkov S. I., Shaikhutdinov K. A.
Заглавие : Current-conducting propertiesof paper consisting of muktiwall carbon nanotudes
Место публикации : J. Experim. Theor. Phys.: Pleiades Publishing, 2013. - Vol. 116, Is. 5. - P.860-865. - DOI 10.1134/S1063776113050257
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Abramova G. M., Petrakovskii G. A., Sokolov V. V., Velikanov D. A., Vorotynov A. M., Bovina A. F., Amirov A. A., Aliev A. M., Khanov L. N., Patrin G. S.
Заглавие : New magnetic materials Cu x Mn1 − x S with a metal-insulator transition
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 3. - P.531–536. - ISSN 1063-7834, DOI 10.1134/S106378341203002X
Примечания : Cited References: 9
Предметные рубрики: Alpha-MnS
Manganese
Аннотация: This paper reports on first results of the synthesis and study of the thermal, structural, electrical, resonance, and magnetic properties of new sulfide materials Mex Mn1 – S (Me = Cu, 0 ˂ x ˂ 0.2) synthesized based on manganese monosulfide. The materials have a NaCl cubic structure at 300 K and undergo a con centration metal–insulator transition with increasing degree of substitution and with varying temperature. The magnetic transition occurs in the region of the heat capacity anomaly. The Néel temperature is slightly dependent on the copper concentration. The samples with a high copper content exhibit metallic conduction at T ˂ 260 K and semiconductor conduction at T ˃ 260 K.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Abramova G. M., Petrakovskii G. A., Velikanov D. A., Vorotynov A. M., Molokeev M. S., Mita Y., Sokolov V. V., Patrin G. S.
Заглавие : Magnetic properties of single crystals of the CrxMn1–xS solid solutions (0 ≤ x ˂ 0.3)
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 2. - P.293–297. - ISSN 1063-7834, DOI 10.1134/S1063783412020023
Примечания : Cited References: 7
Предметные рубрики: Cr
Fe
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Прищепа, Оксана Олеговна, Шабанов, Александр Васильевич, Зырянов, Виктор Яковлевич
Заглавие : Многообразие ориентационных структур в каплях нематических жидких кристаллов и их оптические текстуры
Место публикации : J. Sib. Fed. Univ. Math. Phys. - 2010. - Vol. 3, Is. 3. - P.395-406. - ISSN 1997-1397; Журн. СФУ. Сер. "Математика и физика"
Примечания : Библиогр.: 24
Аннотация: Представлен краткий обзор ориентационных структур в каплях нематических жидких кристал-ов и различных факторов, определяющих специфику их формирования. Основные из этих факторов: соотношение констант упругости жидких кристаллов, размер и форма капель, внешние воздействия (например, электрическое поле) и поверхностное сцепление, определяющее ориентацию молекул нематика на межфазной границе. Подробно рассмотрены особенности структурообразования в капсулированых полимером жидких кристаллах для неоднородных граничных условий.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanova N. B., Platunov M. S., Knyazev Yu.V., Kazak N. V., Bezmaternykh L. N., Vasiliev A. D., Ovchinnikov S. G., Nizhankovskii V. I.
Заглавие : Effect of the diamagnetic dilution on the magnetic ordering and electrical conductivity in the Co3O2BO3 : Ga ludwigite
Место публикации : Phys. Solid State. - 2012. - Vol. 54, Is. 11. - P.2212–2221. - ISSN 1063-7834, DOI 10.1134/S1063783412110133
Примечания : Cited References: 30. - This study was supported by the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (grant no. NSh-1044.2012.2) and the Russian Foundation for Basic Research (project nos. 12-02-00175-a and 12-02-00470-a).
Аннотация: Single crystals of cobalt ludwigite Co3O2BO3 with diamagnetic substitution of Ga3+ ions for a part of the cobalt ions have been grown by the flux method. A detailed investigation of the crystal structure and magnetic properties of the compound has been carried out. A preferred character of the occupation of non-equivalent crystallographic positions by gallium has been revealed. It has been found that the effective magnetic moment and the magnetic ordering temperature are decreased compared to those in the original crystal of the Co3O2BO3 ludwigite. It has been noted that the pronounced magnetic anisotropy observed in the crystal lographic ab plane of the original material of the Co3O2BO3 composition disappears in the presence of gallium.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanova N. B., Kazak N. V., Knyazev Yu.V., Velikanov D. A., Bezmaternykh L. N., Ovchinnikov S. G., Vasiliev A. D., Platunov M. S., Bartolomé J., Patrin G. S.
Заглавие : Crystal structure and magnetic anisotropy of ludwigite Co2FeO2BO3
Место публикации : J. Experim. Theor. Phys. - 2011. - Vol. 113, Is. 6. - P.1015-1024. - DOI 10.1134/S1063776111140172
Примечания : Cited References: 14. - This work was supported by the Russian Founda tion for Basic Research (project no. 090200171a), the Russian Science Foundation (President project no. MK5632.2010.2), and the program of the Divi sion of Physical Sciences of the Russian Academy of Sciences “Strong Electronic Correlations.” REFE
Аннотация: Co3O2BO3 and Co2FeO2BO3 single crystals with a ludwigite structure are fabricated, and their crystal structure and magnetic properties are studied in detail. Substituted ludwigite Co2FeO2BO3 undergoes two-stage magnetic ordering at the temperatures characteristic of Fe3O2BO3 (T N1 ≈ 110 K, T N2 ≈ 70 K) rather than Co3O2BO3 (T N = 42 K). This effect is explained in terms of preferred occupation of nonequivalent crystallographic positions by iron, which was detected by X-ray diffraction. Both materials exhibit a pronounced uniaxial magnetic anisotropy. Crystallographic direction b is an easy magnetization axis. Upon iron substitution, the cobalt ludwigite acquires a very high magnetic hardness.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Voronov V. N., Petrakovskaya E. A.
Заглавие : EPR investigation of local paramagnetic centers in perovskite-like crystals
Место публикации : Phys. Solid State. - 2013. - Vol. 55, Is. 4. - P.730-736. - DOI 10.1134/S1063783413040367
Аннотация: In ScF3 single crystals (pure and doped) as well as in Rb2KScF6 and Rb2KDyF6 crystals with a perovskite-like structure, point nanodefects (vacancy in place of trivalent cations) have been found and studied. Electron paramagnetic resonance has been used to investigate local paramagnetic centers that are not detected using X-ray diffraction. The angular dependence of the spectra indicates a local distortion of the cubic symmetry of the crystals. An additional hyperfine structure in the observed spectra is due to the delocalization of electrons over six F− ions forming the first coordination polyhedron around the vacancy. The crystals studied are characterized by a high electron mobility and a high electron velocity, which depends on the impurity. The high mobility of electrons of the cation center can be indirectly responsible for the structural phase transition occurring in the ScF3 crystal under uniaxial pressure.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Aksenov S. V., Ulanov E. A.
Заглавие : Spin-flip induction of Fano resonance upon electron tunneling through atomic-scale spin structures
Место публикации : J. Experim. Theor. Phys.: Springer, 2013. - Vol. 116, Is. 5. - P.854-859. - DOI 10.1134/S1063776113050130
Аннотация: The inclusion of inelastic spin-dependent electron scatterings by the potential profiles of a single magnetic impurity and a spin dimer is shown to induce resonance features due to the Fano effect in the transport characteristics of such atomic-scale spin structures. The spin-flip processes leading to a configuration interaction of the system’s states play a fundamental role for the realization of Fano resonance and antiresonance. It has been established that applying an external magnetic field and a gate electric field allows the conductive properties of spin structures to be changed radically through the Fano resonance mechanism
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrova I. P., Sukhovsky A. A., Ivanov Y. N., Raevsky I. P.
Заглавие : Local structure of disordered PbSc1/2Nb1/2O3 in the region of the diffuse tetragonal phase-rhombohedral phase transition
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 2. - P.316-323. - ISSN 1063-7834, DOI 10.1134/S1063783412020047
Примечания : Cited References: 16. - This study was supported by the Council on Grants from the President of the Russian Federation for Support of the Leading Scientific Schools of the Russian Federation (grant no. NSh-4645.2010.2).
Предметные рубрики: Neutron-diffraction
Order
BaTiO3
PbNiO3
NMR
Аннотация: The local structure of the ferroelectric-relaxor PbSc1/2Nb1/2O3 in the temperature range from 550 to 220 K has been investigated using 45Sc nuclear magnetic resonance. It has been found that, in the paraelectric phase at temperatures below 550 K, the crystal consists of regions of an ordered elpasolite structure and inclusions of the disordered tetragonal perovskite phase with displacements along directions of the [001] type. The relative weight of the tetragonal structure in the region of the paraelectric phase is approximately equal to 0.28. Below the temperature of the phase transition from the disordered modification to the polar phase, the relative weight of the tetragonal phase decreases with decreasing temperature. The tetragonal structure is replaced by the trigonal polar structure. In a wide temperature range (∼50 K), there exists a heterophase structure that is characteristic of relaxors. Note that the correlation length of displacements in the tetragonal phase should be very small to explain the absence of indications of the existence of this phase in the diffraction data.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Zlotnikov A. O.
Заглавие : Coexistence of superconductivity and antiferromagnetism in heavy-fermion intermetallides
Место публикации : Theor. math. phys. - 2013. - Vol. 174, Is. 3. - P.421-437. - DOI 10.1007/s11232-013-0035-z
Аннотация: Using the two-time retarded Green’s function, we study the conditions for realizing the phase of the superconductivity and antiferromagnetism coexistence in the framework of the effective Hamiltonian for the periodic Anderson model. Such a phase was experimentally observed in rare-earth intermetallides with heavy fermions under an external pressure. In the chosen model, the Cooper instability is induced in the presence of long-range antiferromagnetic ordering as a result of the combined effect of a superexchange interaction in the subsystem of localized electrons and the hybridization between two groups of electrons. Applying an external pressure induces an increase in the energy of the localized level accompanied by an abrupt destruction of the long-range antiferromagnetic ordering in a certain region of the phase diagram. The superconductivity order parameter has a maximum value at the destruction point. We show that the decrease in the antiferromagnetic-sublattice magnetization with increasing pressure leads to a significant increase in the masses of Fermi quasiparticles, and the sign of the current carriers reverses at the critical point. The obtained results qualitatively agree well with the experimental data for the heavy-fermion intermetallide CeRhIn 5 .
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