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Magnetic phase diagram of the olivine-type Mn2GeO4 single crystal estimated from magnetic, resonance and thermodynamic properties / N. V. Volkov [et al.] // 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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Держатели документа:
Kirensky Inst Phys SB RAS, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Dept Phys, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Volkov, N. V.; Волков, Никита Валентинович; Mikhashenok, N. V.; Михашенок, Наталья Владимировна; Sablina, K. A.; Саблина, Клара Александровна; Bayukov, O. A.; Баюков, Олег Артемьевич; Gorev, M. V.; Горев, Михаил Васильевич; Balaev, A. D.; Балаев, Александр Дмитриевич; Pankrats, A. I.; Панкрац, Анатолий Иванович; Tugarinov, V. I.; Тугаринов, Василий Иванович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Popkov, S. I.; Попков, Сергей Иванович
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Механизм Кона-Латтинжера и фазовая диаграмма сверхпроводящего состояния в модели Шубина-Вонсовского / М. Ю. Каган [и др.] // Журн. эксперим. и теор. физ. - 2013. - Т. 144, Вып. 4. - С. 837-852
Аннотация: В рамках модели Шубина - Вонсовского для режима слабой связи WUV (W - ширина зоны, U - хаббардовское отталкивание на узле, V - кулоновское взаимодействие на соседних узлах) на основе механизма Кона - Латтинжера определены области реализации сверхпроводящих фаз с dxy-, p-, s- и dx2-y2-типами симметрии параметра порядка. Показано, что для эффективного взаимодействия в куперовском канале существенную роль играют не только одноузельные, но и межузельные кулоновские корреляции. Этот факт продемонстрирован на примере качественного изменения и усложнения фазовой диаграммы сверхпроводящего состояния. Вскрыт механизм индуцирования сверхпроводящей фазы при учете поляризационных вкладов во втором порядке теории возмущений по кулоновскому взаимодействию. Проведено сравнение полученных результатов по угловой зависимости сверхпроводящей щели в различных каналах с экспериментальными данными по фотоэмиссии с угловым разрешением (ARPES). Проанализировано влияние дальних перескоков на фазовую диаграмму и критическую температуру сверхпроводящего перехода в различных каналах. Определены условия возникновения сверхпроводимости Кона - Латтинжера с dx2-y2-типом симметрии и высокими значениями критической температуры Tc ~ 100 K вблизи половинного заполнения.

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Переводная версия The Kohn-Luttinger mechanism and phase diagram of the superconducting state in the Shubin-Vonsovsky model. - [Б. м. : б. и.]

Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Каган, Максим Юрьевич; Вальков, Валерий Владимирович; Val'kov, V.V.; Мицкан, Виталий Александрович; Mitskan, V.A.; Коровушкин, Максим Михайлович; Korovushkin, M.M.
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The magnetic P-T phase diagram of langasite Ba3TaFe 3Si2O14 at high hydrostatic pressures up to 38 GPa / A. G. Gavriliuk [et al.] // Applied Physics Letters. - 2013. - Vol. 103, Is. 16. - Ст. 162402. - P. , DOI 10.1063/1.4822422 . - ISSN 0003-6951
Аннотация: The langasite-type crystals with 3d ions are considered as a class of multiferroics in which ferroelectricity can be induced by the magnetic ordering. In this paper, the high-pressure magnetic states of the langasite-type powdered sample Ba3TaFe3Si2O14 have been investigated in a diamond anvil cell by the nuclear forward scattering of synchrotron radiation technique at different temperatures in hydrostatic conditions. In the pressure range of 0 < P < 19.5 GPa, an increase of the Neel temperature TN from 27 to 41 K was observed in the antiferromagnetic phase of the material. At pressures ?19.5 GPa, a transition to another magnetic phase with huge increase in the Neel temperature to ?120 K was found. We attribute this change to the structural transition at ?19.5 GPa which is evidenced by a drastic change of Raman spectra at this pressure. A tentative magnetic P-T phase diagram of Ba3TaFe 3Si2O14 is proposed. В© 2013 AIP Publishing LLC.

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Держатели документа:
Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA
Russian Acad Sci, Inst Crystallog, Moscow 119333, Russia
Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Carnegie Inst Sci, Geophys Lab, High Pressure Collaborat Access Team, Argonne, IL 60439 USA

Доп.точки доступа:
Gavriliuk, A. G.; Lyubutin, I. S.; Starchikov, S. S.; Mironovich, A. A.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Trojan, I. A.; Xiao, Yuming; Chow, P.; Sinogeikin, S. V.; Struzhkin, V. V.
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Calorimetric and 23Na MAS NMR study of the phase diagram of NANB1_xTAxO3 solid solutions / I. P. Aleksandrova [et al.] // Functional Materials. - 2010. - Vol. 17, Is. 1. - P. 18-23 . - ISSN 1027-5495
Аннотация: The heat capacity of NaNb1_xTaxO3 solid solutions was measured in the temperature range 100 to 770 K. The step-like change of phase transition temperature is observed in the T-x phase diagram at concentration x = 0.55. The obtained results are in a good agreement with the data of dielectric studies. The 23Na MAS NMR spectra were obtained at Larmor frequency 79.35 MHz using a Bruker AVANCE 300 spectrometer. The quadru-polar coupling constant, (CQ=e2qQ/h) and asymmetry parameter (n) were determined by computer fitting of the NMR line shape using the DMFit software. The found parameters show that solid solution structure is NaTa03-based at 0.7<X ?1 and NaNbO3-based at 0?x?0.5. The spectra in the intermediate region (0.5<x?0.7) can be described at a reasonable accuracy when assuming the coexistence of NaTaO3 and NaNbO3 structures. В© 2010 - STC "Institute for Single Crystals".

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Держатели документа:
L. V. Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, 660036 Krasnoyarsk, Russian Federation
Siberian Federal University, 660041 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Aleksandrova, I. P.; Александрова, Инга Петровна; Ivanov, Y. N.; Иванов, Юрий Николаевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Sukhovskii, A. A.; Суховский, Андрей Андреевич; Voronov, V. N.; Воронов, Владимир Николаевич
}
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The Kohn-Luttinger mechanism and phase diagram of the superconducting state in the Shubin-Vonsovsky model / M. Y. Kagan [et al.] // Journal of Experimental and Theoretical Physics. - 2013. - Vol. 117, Is. 4. - P. 728-741, DOI 10.1134/S1063776113120030 . - ISSN 1063-7761
Аннотация: Using the Shubin-Vonsovsky model in the weak-coupling regime W > U > V (W is the bandwidth, U is the Hubbard onsite repulsion, and V is the Coulomb interaction at neighboring sites) based on the Kohn-Luttinger mechanism, we determined the regions of the existence of the superconducting phases with the d xy, p, s, and $d-{x. - y. } $ symmetry types of the order parameter. It is shown that the effective interaction in the Cooper channel considerably depends not only on single-site but also on intersite Coulomb correlations. This is demonstrated by the example of the qualitative change and complication of the phase diagram of the superconducting state. The superconducting (SC) phase induction mechanism is determined taking into account polarization contributions in the second-order perturbation theory in the Coulomb interaction. The results obtained for the angular dependence of the superconducting gap in different channels are compared with angule-resolved photoemission spectroscopy (ARPES) results. The influence of long-range hops in the phase diagram and critical superconducting transition temperature in different channels is analyzed. The conditions for the appearance of the Kohn-Luttinger superconductivity with the $d-{x. - y. } $ symmetry and high critical temperatures T c ? 100 K near the half-filling are determined. В© 2013 Pleiades Publishing, Inc.

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Публикация на русском языке Механизм Кона-Латтинжера и фазовая диаграмма сверхпроводящего состояния в модели Шубина-Вонсовского // Журнал экспериментальной и теоретической физики. - 2013. - Т. 144, Вып. 4(10). - С. 837-852

Держатели документа:
Russian Acad Sci, Kapitza Inst Phys Problems, Moscow 119334, Russia
Russian Acad Sci, Siberian Branch, Kirenskii Phys Inst, Krasnoyarsk 660036, Russia
Reshetnev Siberian Aerosp Univ, Krasnoyarsk 660014, Russia

Доп.точки доступа:
Kagan, M. Y.; Val'kov, V. V.; Вальков, Валерий Владимирович; Mitskan, V. A.; Мицкан, Виталий Александрович; Korovushkin, M. M.; Коровушкин, Максим Михайлович
}
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P-T phase diagram of iron arsenide superconductor NdFeAsO0.88F0.12 / A. G. Gavriliuk [et al.] // Europhys. Lett. - 2012. - Vol. 100, Is. 4. - Ст. 46005, DOI 10.1209/0295-5075/100/46005. - Cited References: 26. - This work is supported by DOE (grant No. DE-FG02-02ER45955), by the Russian Foundation for Basic Research (grants 11-02-00291-a, 11-02-00636-a, 12-02-90410_Ukr-a, 12-02-31534-a), by the RAS Program "Strongly correlated electronic systems", by the Russian Ministry of Science (grants 01.164.12.HB11, 16.518.11.7021), Presidium of RAS programs "Quantum physics of condensed matter" project 20.7 and "Matter at high density of energy" project 2.16, FCP Scientific and Research-and-Educational Personnel of Innovative Russia for 2009-2013 (GK 2011-1.3.1-121-018 and GK 16.740.12.0731). Work at UT Austin is supported by Energy Frontier Research in Extreme Environments (EFree) and the Carnegie/DOE Alliance Center (CDAC). SGO and MMK were partially supported by the Leading scientific schools of Russia (NSh 1044-2012.2). MMK acknowledges support from the Dynasty Foundation and ICFPM. . - ISSN 0295-5075

РУБ Physics, Multidisciplinary
Рубрики:
TRANSITION
METAL
Аннотация: NdFeAsO0.88F0.12 belongs to the recently discovered family of high-T-C iron-based superconductors. We have studied the influence of high pressure on transport properties of this material at low temperatures using the four-probe electrical conductivity technique in a diamond cell. Contrary to La-based compounds, we did not observe a maximum in T-C under pressure. Under compression, T-C drops rapidly as a linear function of pressure with the slope k = -2.8 +/- 0.1 K/GPa. Under decompression, the behavior is completely reversible. The extrapolated value of T-C at zero pressure is about T-C(0) = 51.7 +/- 0.4 K. At pressures higher than similar to 18.4 GPa, the superconducting state disappears at all measured temperatures, although electrical resistance changes slope dramatically and shows a concave behavior. These observations may be related to the Kondo effect or to a weak localization of two-dimensional carriers at high pressures and low temperatures below similar to 45 K, indicating a competition mechanism with the superconducting phase. On the bases of our experimental data, we propose a tentative P-T phase diagram of NdFeAsO0.88F0.12. Copyright (C) EPLA, 2012

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Держатели документа:
[Gavriliuk, Alexander G.
Struzhkin, Viktor V.
Yu, Yong] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA
[Gavriliuk, Alexander G.] Russian Acad Sci, Inst Crystallog, Moscow 119333, Russia
[Gavriliuk, Alexander G.
Mironovich, Anna A.] Russian Acad Sci, Inst Nucl Res, Moscow 142190, Russia
[Ovchinnikov, Sergey G.
Korshunov, Maxim M.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Ovchinnikov, Sergey G.
Korshunov, Maxim M.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Yu, Yong
Lin, Jung-Fu] Univ Texas Austin, Jackson Sch Geosci, Dept Geol Sci, Austin, TX 78712 USA
[Jin, Changqing] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

Доп.точки доступа:
Gavriliuk, A. G.; Struzhkin, V. V.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Yu, Y.; Korshunov, M. M.; Коршунов, Максим Михайлович; Mironovich, A. A.; Lin, J. F.; Jin, C. Q.
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Heat capacity and structure of Rb2KMeO3F3 (Me: Mo, W) elpasolites / A. V. Kartashev [et al.] // Solid State Sci. - 2012. - Vol. 14, Is. 1. - P. 166-170, DOI 10.1016/j.solidstatesciences.2011.11.019. - Cited References: 12. - This study was supported by the Siberian Branch of the Russian Academy of Sciences (Grant no. 34) and the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation (NSh-4645.2010.2). . - ISSN 1293-2558

РУБ Chemistry + Physics
Рубрики:
T PHASE-DIAGRAM
Rb2KMoO3F3
TRANSITION
Кл.слова (ненормированные):
Oxyfluorides -- Crystal structure -- Phase transition -- Calorimetry
Аннотация: X-ray and heat capacity measurements were performed on Rb2KMoO3F3 and Rb2KWO3F3 single crystals. A significant difference in the thermal parameters of atoms in 4a and 8c sites of Fm-3m structure was found, which depended on the central atom. Calorimetric measurements have revealed the heat capacity anomalies at 195 and 67 K, respectively, in Rb2KMoO3F3 and Rb2KWO3F3. The standard molar enthalpy and entropy were determined. Entropy changes associated with phase transitions in oxyfluorides under study and related Rb2KTiOF5 are discussed. 2011 Elsevier Masson SAS. All rights reserved.

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Держатели документа:
[Gorev, Michail V.] Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Kartashev, Andrey V.
Gorev, Michail V.
Flerov, Igor N.] Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660074, Russia
[Isaenko, Lyudmila I.
Zhurkov, Sergey A.] Russian Acad Sci, Inst Geol & Mineral, Novosibirsk 630090, Russia

Доп.точки доступа:
Kartashev, A. V.; Карташев, Андрей Васильевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Isaenko, L. I.; Zhurkov, S. A.; Fokina, V. D.; Фокина, Валентина Дмитриевна; Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Siberian Branch of the Russian Academy of Sciences [34]; Russian Federation for the Support of Leading Scientific Schools of the Russian Federation [NSh-4645.2010.2]
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Val'kova, T. A.
Modifying the spin diagram technique for describing quantum magnets with strong fluctuations / T. A. Val'kova, V. V. Val'kov // Bull. Russ. Acad. Sci.: Phys. - 2012. - Vol. 76, Is. 7. - P. 768-770, DOI 10.3103/S1062873812070374. - Cited References: 7. - This work was supported by the Quantum Physics of Condensed Matter Program for Basic Research of the Presidium of the Russian Academy of Sciences; and by the federal target program Scientists and Science Teachers of an Innovative Russia, 2009–2013. . - ISSN 1062-8738
Кл.слова (ненормированные):
Elementary excitations -- First-order -- Mass operator -- Quantum magnets -- Self-consistent field method -- Spin operators -- Magnets -- Spin fluctuations
Аннотация: Using the diagram technique for spin operators, the exact representations for quantum magnets are obtained that express the Green's functions via the components of mass operator ∑αβ, end factors L and Q, and the Larkin-and Dyson-irreducible part T- irr.The elementary excitation spectrum and mean magnetization are calculated accurate to the first-order contributions on the parameter r0 -3 by the self-consistent field method.

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Публикация на русском языке Валькова, Татьяна Александровна. Модификация спиновой диаграммной техники для описания квантовых магнетиков с сильными флуктуациями [Текст] / Т. А. Валькова, В. В. Вальков // Изв. РАН. Сер. физич. - 2012. - Т. 76 № 7. - С. 858-860

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; International Interdisciplinary Symposium “Ordering in Minerals and Alloys” (14th ; 8 -13 Sept. 2011 ; Rostov-on-Don)
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The Kohn-Luttinger effect and anomalous pairing in new superconducting systems and graphene / M. Y. Kagan [et al.] // J. Exp. Theor. Phys. - 2014. - Vol. 118, Is. 6. - P. 995-1011, DOI 10.1134/S1063776114060132. - Cited References: 114. - This study was supported by the Program of the Physics Department of the Russian Academy of Sciences (project no. P.3.1) and the Russian Foundation for Basic Research (project nos. 14-02-00058 and 14-02-31237). The work of two coauthors (M. M. K. and V.A.M) was supported financially by grant no. MK-526.2013.2 of the President of the Russian Federation and the Dynasty Foundation. . - ISSN 1063-7761. - ISSN 1090-6509

РУБ Physics, Multidisciplinary
Рубрики:
P-WAVE SUPERCONDUCTIVITY
   EXTENDED HUBBARD-MODEL
   NARROW ENERGY-BANDS
   2D KONDO-LATTICE
   FERMI GAS
   REPULSIVE INTERACTIONS
   ELECTRON CORRELATIONS
   COOPER INSTABILITY
   PHASE-DIAGRAM
   SPECTRUM
Аннотация: We present a review of theoretical investigations into the Kohn-Luttinger nonphonon superconductivity mechanism in various 3D and 2D repulsive electron systems described by the Fermi-gas, Hubbard, and Shubin-Vonsovsky models. Phase diagrams of the superconducting state are considered, including regions of anomalous s-, p-, and d-wave pairing. The possibility of a strong increase in the superconducting transition temperature T c even for a low electron density is demonstrated by analyzing the spin-polarized case or the two-band situation. The Kohn-Luttinger theory explains or predicts superconductivity in various materials such as heterostructures and semimetals, superlattices and dichalcogenides, high-T c superconductors and heavy-fermion systems, layered organic superconductors, and ultracold Fermi gases in magnetic traps. This theory also describes the anomalous electron transport and peculiar polaron effects in the normal state of these systems. The theory can be useful for explaining the origin of superconductivity and orbital currents (chiral anomaly) in systems with the Dirac spectrum of electrons, including superfluid 3He-A, doped graphene, and topological superconductors.

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Публикация на русском языке Эффект Кона-Латтинжера и аномальное спаривание в новых сверхпроводящих системах и графене [Текст] / М. Ю. Каган [и др.] // Журн. эксперим. и теор. физ. : Наука, 2014. - Т. 118 Вып. 6. - С. 1127-1146

Держатели документа:
Russian Acad Sci, Kapitza Inst Phys Problems, Moscow 119334, Russia
Natl Res Univ, Higher Sch Econ, Moscow State Inst Elect & Math, Moscow 109028, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia

Доп.точки доступа:
Kagan, M. Y.; Val'kov, V. V.; Вальков, Валерий Владимирович; Mitskan, V. A.; Мицкан, Виталий Александрович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Physics Department of the Russian Academy of Sciences [P.3.1]; Russian Foundation for Basic Research [14-02-00058, 14-02-31237]; Russian Federation [MK-526.2013.2]; Dynasty Foundation
}
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10.

    Ferroelastic phase transitions in fluorides with cryolite and elpasolite structures / I. N. Flerov [et al.] // Crystallogr. Rep. - 2004. - Vol. 49, Is. 1. - P. 100-107, DOI 10.1134/1.1643969. - Cited References: 43 . - ISSN 1063-7745
Рубрики:
NUCLEAR MAGNETIC-RESONANCE
   THERMODYNAMIC PROPERTIES
   RB2KMIIIF6 ELPASOLITES
   NEUTRON-DIFFRACTION
   CRYSTALS
   PEROVSKITES
   DIAGRAM
   SC
   RB2KGAXSC1-XF6
   SCATTERING
Аннотация: The ferroelastic phase transitions are investigated in several series of fluoride crystals belonging to the elpasolite and cryolite families (space group Fm (3) over barm) with the general formula A(2)BB'F-6. The influence of the size and shape of cations and anions on the entropy and the mechanism of structural distortions is discussed. (C) 2004 MAIK "Nauka/Interperiodica".

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Публикация на русском языке Сегнетоэластические фазовые переходы во фторидах со структурой криолита и эльпасолита [Текст] / И. Н. Флеров [и др.] // Кристаллография. - 2004. - Т. 49 Вып. 1. - С. 107-114

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
Inst Chim Mat Condensee Bordeaux, F-33608 Pessac, France
ИФ СО РАН

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Tressaud, A.; Fokina, V. D.; Фокина, Валентина Дмитриевна
}
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