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Kohn-Luttinger effect and anomalous pairing in repulsive Fermi-systems at low density : Review Article / M. Yu. Kagan [et al.] // Физ. низких температур. - 2012. - Т. 38, Вып. 9. - С. 1102-1108. - Библиогр.: 59 назв. - We acknowledge helpful discussions with A. V. Chubukov, A. S. Alexandrov, V. V. Kabanov, K. I. Kugel, Yu. V. Kopaev, N. M. Plakida, and N. V. Prokof'ev. M. Yu. K's work was supported by RFBR Grant No 11-02-00741-a. . - ISSN 0132-6414
Кл.слова (ненормированные):
3D and 2D Hubbard model -- Fermi-gas model -- Superconductivity
Аннотация: In the large variety of models such as 3D and 2D Fermi-gas model with hard-core repulsion, 3D and 2D Hubbard model, and Shubin-Vonsovsky model we demonstrate the possibility of triplet p-wave pairing at low electron density. We show that the critical temperature of the p-wave pairing can be strongly increased in a spinpolarized case or in a two-band situation already at low density and reach experimentally observable values of (1-5) K. We also discuss briefly d-wave pairing and high-T c superconductivity with T c ∼ 100 K which arises in the extended Hubbard model and in the generalized t-J model close to half-filling.

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Переводная версия Kohn-Luttinger effect and anomalous pairing in repulsive Fermi-systems at low density [Текст] : Review Article / M. Y. Kagan [et al.] // Low Temp. Phys. : American Institute of Physics, 2012. - Vol. 38 Is. 9.- P.874-879

Держатели документа:
Kapitza Institute for Physical Problems, Kosygin Str. 2, Moscow 19334, Russian Federation
Max-Planck-Institut Fur Festkorperforschung, Stuttgart D-70569, Germany
Department of Physics and Astronomy, Hofstra University, Hempstead, NY 11549, United States
Kirenskii Institute of Physics, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Kagan, M.Yu.; Efremov, D. V.; Mar'Enko, M. S.; Val'kov, V. V.; Вальков, Валерий Владимирович
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Kohn-Luttinger effect and anomalous pairing in repulsive Fermi-systems at low density : Review Article / M. Y. Kagan [et al.] // Low Temp. Phys. - 2012. - Vol. 38, Is. 9. - P. 874-879, DOI 10.1063/1.4752091. - Cited References: 59. - We acknowledge helpful discussions with A. V. Chubukov, A. S. Alexandrov, V. V. Kabanov, K. I. Kugel, Yu. V. Kopaev, N. M. Plakida, and N. V. Prokof'ev. M. Yu. K's work was supported by RFBR Grant No 11-02-00741-a. . - ISSN 1063-777X

РУБ Physics, Applied
Рубрики:
T-J MODEL
   SUPERFLUID TRANSITION-TEMPERATURE
   2-BAND HUBBARD-MODEL
   LOW ELECTRON-DENSITY
   FRACTIONAL-STATISTICS
   PHASE-SEPARATION
   SUPERCONDUCTIVITY
   GAS
   ENHANCEMENT
   MECHANISM
Кл.слова (ненормированные):
d-wave superconductivity -- electron density -- electron spin polarisation -- high-temperature superconductors -- Hubbard model -- superconducting transition temperature -- t-J model -- two-dimensional electron gas
Аннотация: We demonstrate the possibility of triplet p-wave pairing at low electron density a large number of models such as 3D and 2D Fermi-gas models with hard-core repulsion, 3D and 2D Hubbard models, and the Shubin-Vonsovsky model. The critical temperature for p-wave pairing can be considerably higher in the spin-polarized case or even in a two-band situation at low density and can reach experimentally observable values of 1–5 K. We also discuss briefly the d-wave pairing and high-Tc superconductivity with Tc ∼ 100 K which arise in the extended Hubbard model and in the generalized t-Jmodel when close to half-filling.

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Публикация "на русском языке" Kohn-Luttinger effect and anomalous pairing in repulsive Fermi-systems at low density [Текст] : Review Article / M. Yu. Kagan [et al.] // Физ. низких температур : Физико-технический институт низких температур им. Б.И. Веркина НАН Украины, 2012. - Т. 38 Вып. 9.- С.1102-1108

Держатели документа:
[Kagan, M. Yu.] Kapitza Inst Phys Problems, Moscow 19334, Russia
[Efremov, D. V.] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
[Mar'enko, M. S.] Hofstra Univ, Dept Phys & Astron, Hempstead, NY 11549 USA
[Val'kov, V. V.] Kirenskii Inst Phys, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Kagan, M. Y.; Каган, Максим Юрьевич; Efremov, D. V.; Mar'enko, M. S.; Val'kov, V. V.; Вальков, Валерий Владимирович
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Actual composition and structure of manganese ferrite nanoparticles dispersed in the borate glass matrix / I. G. Vasilyeva [et al.] // Doklady Chemistry. - 2005. - Vol. 401, Is. 1-3. - P. 47-50, DOI 10.1007/s10631-005-0029-y . - ISSN 0012-5008
Кл.слова (ненормированные):
boric acid -- ferrite -- glass -- manganese derivative -- analytic method -- article -- chemical composition -- chemical structure -- nanoparticle -- stoichiometry -- structure analysis -- transmission electron microscopy -- X ray analysis

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Публикация на русском языке Реальный состав и структура наночастиц феррита марганца, диспергированных в матрице боратных стекол [Текст] / И. Г. Васильева [и др.] // Доклады Академии наук. - 2005. - Т. 401 № 3. - С. 349-352

Держатели документа:
Nikolaev Inst. of Inorg. Chemistry, Siberian Division, Russian Academy of Sciences, pr. akademika Lavrent'eva 3, Novosibirsk, 630090, Russian Federation
Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, pr. akademika Lavrent'eva 5, Novosibirsk, 630090, Russian Federation
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
All-Russia Research Center, Vavilov State Optical Institute, ul. Babushkina 36/1, St. Petersburg, 192371, Russian Federation

Доп.точки доступа:
Vasilyeva, I. G.; Dovlitova, L. S.; Zaikovskii, V. I.; Malakhov, V. V.; Edel'man, I. S.; Эдельман, Ирина Самсоновна; Stepanov, A. S.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
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Spin-glass state in CuGa2O4 / G. A. Petrakovskii [et al.] // Phys. Rev. B. - 2001. - Vol. 63, Is. 18. - Ст. 184425, DOI 10.1103/PhysRevB.63.184425. - Cited References: 28 . - ISSN 0163-1829

РУБ Physics, Condensed Matter
Рубрики:
TRANSITION
Кл.слова (ненормированные):
copper -- gallium -- glass -- oxygen -- acceleration -- article -- magnetism -- measurement -- molecular dynamics -- phase transition
Аннотация: Magnetic susceptibility, magnetization, specific-heat, and positive muon spin relaxation (?SR) measurements have been used to characterize the magnetic ground state of the spinel compound CuGa2O4. We observe a spin-glass transition of the S = 1/2 Cu2+ spins below Tf = 2.5 K characterized by a cusp in the susceptibility curve which is suppressed when a magnetic field is applied. We show that the magnetization of CuGa2O4 depends on the magnetic history of the sample. Well below Tf, the muon signal resembles the dynamical Kubo-Toyabe expression reflecting that the spin freezing process in CuGa2O4 results in a Gaussian distribution of the magnetic moments. By means of Monte Carlo simulations, we obtain the relevant exchange integrals between the Cu2+ spins in this compound.

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Держатели документа:
Institute of Physics, Academy of Sciences, Siberian Branch, 660036 Krasnoyarsk, Russian Federation
Laboratory for Neutron Scattering, Paul Scherrer Institute, ETH Zurich, CH-5232 Villigen PSI, Switzerland
Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
Instituto de Ciencia de Materiales de Aragon, CSIC-Universidad de Zaragoza, Ciudad Universitaria, 50009 Zaragoza, Spain
Kamerlingh Onnes Laboratorium, Leiden University, Netherlands

Доп.точки доступа:
Petrakovskii, G. A.; Петраковский, Герман Антонович; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Aplesnin, S. S.; Аплеснин, Сергей Степанович; Roessli, B.; Semadeni, F.; Amato, A.; Baines, C.; Bartolome, J.; Evangelisti, M.
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    Gd3Ga5O12:Nd3+ crystals for a continuous-wave diode-pumped laser operating in 4F3/2 4I11/2 and 4F3/2 4I13/2 channels / A. A. Kaminskii [et al.] // Crystallogr. Rep. - 2002. - Vol. 47, Is. 2. - P. 308-312, DOI 10.1134/1.1466508. - Cited References: 15 . - ISSN 1063-7745
Рубрики:
GALLIUM GARNET
   EMISSION
Кл.слова (ненормированные):
gadolinium -- gallium -- neodymium -- article -- concentration response -- crystal -- pump -- spectroscopy -- X ray -- x ray topography
Аннотация: Garnet crystals of the composition Gd3Ga5O12:Nd3+ (concentration series CNd = 1-10 at. %) were grown from flux. In terms of spectroscopy, these crystals, unlike those grown from melts, form a medium with a single activator center. For the first time, continuous-wave lasing was excited by diode pumping with the use of Gd3Ga5O12:Nd3+ crystals at the wavelengths ?3 = 1.3315 and ?4 = 1.3370 ?m of the 4F3/2 > 4I13/2 channel and also the simultaneous generation at two wavelengths, ?1 = 1.0621 and ?2 = 1.0600 ?m, of the 4F3/2 > 4I11/2 channel. В© 2002 MAIK "Nauka/Interperiodica".

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Другая переводная версия Crystals Gd3Ga5O12:Nd3+ for a continuous-wave diode-pumped laser operating in 4F3/24I11/2 and 4F3/24I13/2 channels [Текст] / A. A. Kaminskij [и др.] // Kristallogr. - 2002. - Vol. 47 Is. 2.- P.344-349 ; Crystallogr. Rep.

Публикация на русском языке Раствор-расплавные кристаллы Gd3Ga5O12:Nd3+ для непрерывных лазеров (4F3/2→4I11/2 и 4F3/2→4I13/2 каналы) с диодно-лазерной накачкой [Текст] / А. А. Каминский [и др.] // Кристаллография. - 2002. - Т. 47 Вып. 2. - С. 344-348

Держатели документа:
Shubnikov Inst. of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow 117333, Russian Federation

Доп.точки доступа:
Kaminskii, A. A.; Butashin, A. V.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Temerov, V. L.; Темеров, Владислав Леонидович; Kravtsov, N. V.; Firsov, V. V.; Seo, D. T.; Hommerich, U.; Temple, D.; Braud, A.
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Raman scattering study of the upper phase transition in CsScF4 / A. N. Vtyurin [et al.] // Journal of Raman Spectroscopy. - 2000. - Vol. 31, Is. 3. - P. 151-155, DOI 10.1002/(SICI)1097-4555(200003)31:3151::AID-JRS5103.0.CO;2-T . - ISSN 0377-0486
Кл.слова (ненормированные):
article -- crystal -- heating -- high temperature -- melting point -- neutron scattering -- phase transition -- photon -- Raman spectrometry -- temperature dependence
Аннотация: Effects of the phase transition between the high-temperature tetragonal phases of the CsScF4 crystal were studied by Raman scattering. The appearance of new lines including a soft mode was observed below the phase transition point, in complete accordance with the new crystal symmetry. The behavior of the soft mode, which corresponds to in-phase rotations of ScF6 rigid groups around the z-axis (and out-of-phase within perovskite-like layers), resembles that observed earlier in RbAlF4, which suggests a similar mechanism of this transition in both crystals. Copyright (C) 2000 John Wiley and Sons, Ltd.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk 660036, Russian Federation
Laboratoire Physique de l'Etat Condens, UPRES A CNRS No. 6087, Universit du Maine, 72085 Le Mans Cdex g, France

Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Bulou, A.; Krylov, A. S.; Крылов, Александр Сергеевич; Shmygol, I. V.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
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Dielectric properties of a mixed-valence Pb3Mn7O15 manganese oxide / N. V. Volkov [et al.] // J. Phys.: Condens. Matter. - 2010. - Vol. 22, Is. 37. - Ст. 375901, DOI 10.1088/0953-8984/22/37/375901. - Cited References: 14. - This study was supported by the Russian Foundation for Basic Research 'Siberia', project No. 09-02-98003, and the Siberian Branch of the Russian Academy of Sciences, integration project No. 101. . - ISSN 0953-8984

РУБ Physics, Condensed Matter

Кл.слова (ненормированные):
cation -- lead -- manganese derivative -- oxide -- article -- chemical model -- chemistry -- crystallization -- electric conductivity -- electronics -- methodology -- temperature -- Cations -- Crystallization -- Electric Conductivity -- Electronics -- Lead -- Manganese Compounds -- Models, Chemical -- Oxides -- Temperature -- AC electric field -- Analysis of resistivity -- Carrier hopping -- Charge ordering -- Complex dielectric constant -- Crystal site -- Debye models -- Dielectric constants -- Dielectric spectra -- Frequency windows -- Lattice sites -- Low frequency -- Manganese ions -- Mixed valence -- Mixed valence state -- Relaxation behaviors -- Temperature range -- Electric fields -- Manganese -- Manganese oxide -- Permittivity -- Single crystals -- Crystal symmetry
Аннотация: We investigated the low-frequency dielectric properties of a Pb3Mn7O15 single crystal with manganese ions in the mixed-valence state (Mn3+/Mn4+). Dielectric relaxation was found in the frequency window from 20 to 100 kHz in the temperature range 110-180 K. The dielectric spectra of the crystal were analyzed using a Debye model. Estimations made within the model and analysis of resistivity data suggest that the relaxation behavior of the dielectric constant is related to polaronic charge carrier hopping. Around 250 K, charge ordering occurs in the crystal when the Mn3+ and Mn4+ ions are arranged in a specific order among the crystal sites. With a decrease in temperature, an ac electric field can induce a charge hop between the equivalent lattice sites available, related to crystal symmetry. This hopping is equivalent to the reorientation of an electric dipole that yields Debye-type behavior of the complex dielectric constant. The observed anisotropy in the behavior of the dielectric properties and resistivity can be attributed to a pronounced two-dimensional character of the crystal structure.

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Держатели документа:
[Volkov, N. V.
Eremin, E. V.
Sablina, K. A.
Sapronova, N. V.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
L V Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russia.
L V Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Volkov, N. V.; Волков, Никита Валентинович; Eremin, E. V.; Еремин, Евгений Владимирович; Sablina, K. A.; Саблина, Клара Александровна; Sapronova, N. V.
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Magnetic anisotropy quantitative estimation for the rhombohedral antiferromagnetic crystals containing S-state ions - art. no. 224405 (Retracted Article. see vol 72, art. no. 189901, 2005) / V. V. Men'shikov [et al.] // Phys. Rev. B. - 2005. - Vol. 71, Is. 22. - Ст. 224405, DOI 10.1103/PhysRevB.71.224405. - Cited References: 33 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
ELECTRON-PARAMAGNETIC-RES
   EXCHANGE-COUPLED PAIRS
   RESONANCE MEASUREMENTS
   GARNETS
   MN-2
Аннотация: The method to investigate "single-ion" exchange anisotropy (as predicted by the pair model) is treated by exploration of several isostructural diamagnetic crystals containing magnetic impurities. The electron paramagnetic resonance (EPR) spectra were observed for ferric borate isostructural crystals MBO(3): Fe(3+) (M = Ga, In, Lu, Sc). The experimental dependences of the spin-Hamiltonian axial parameters of the second-order D(S) and fourth-order (a-F)(cS) versus total pair spin S are presented. The contributions arising from the distortion of the parent crystal lattice MBO3 under magnetic dilution are estimated. The microscopic derived expressions for the "single-ion" contribution to the anisotropy are also presented. The present experimental data enable estimation of the "single- ion" exchange contribution for FeBO(3), MnCO(3), and alpha-Fe(2)O(3) crystals at T= 0 K. The quantitative estimations for EPR are in satisfactory agreement among themselves and with the experimental data.

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Держатели документа:
LV Kirenskii Inst Phys, SB RAS, Krasnoyarsk 660036, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics SB RAS, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Men'shikov, V. V.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Rudenko, V. V.; Руденко, Валерий Васильевич; Sudakov, A. N.; Tugarinov, V. I.; Тугаринов, Василий Иванович; Vorotynov, A. M.; Воротынов, Александр Михайлович
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Conductivity, weak ferromagnetism, and charge instability in an alpha-MnS single crystal / S. S. Aplesnin [et al.] // Phys. Rev. B. - 2005. - Vol. 71, Is. 12. - Ст. 125204 ; Phys. Rev. B Condens. Matter Mater. Phys. - 2005. - Vol. 71, Is. 12. - Ст. 125204, DOI 10.1103/PhysRevB.71.125204. - Cited References: 11 . - ISSN 1098-0121. - Вариант Sopus

РУБ Physics, Condensed Matter
Рубрики:
MANGANITES
Кл.слова (ненормированные):
ferromagnetic material -- manganese derivative -- absorption spectroscopy -- article -- calculation -- conductance -- crystal -- electron spin resonance -- hybridization -- magnetic field -- magnetism -- measurement -- molecular interaction -- temperature dependence -- temperature measurement -- ferromagnetic material -- manganese derivative -- absorption spectroscopy -- article -- calculation -- conductance -- crystal -- electron spin resonance -- hybridization -- magnetic field -- magnetism -- measurement -- molecular interaction -- temperature dependence -- temperature measurement
Аннотация: The temperature dependence of resistivity, magnetization, and electron-spin resonance of the α-MnS single crystal were measured in temperature range of 5 K < T< 550 K. Magnetization hysteresis in an applied magnetic field up to 0.7 T at T=5, 77, and 300 K, irreversible temperature behavior of magnetization, and resistivity were found. The obtained data were explained in terms of a degenerate tight binding model using random phase. approximation. The contribution of holes in t(2g) and e(g) bands of manganese ions to the conductivity, optical absorbtion spectra, and charge instability in α-MnS were studied. Charge susceptibility maxima resulted from the competition of the on-site Coulomb interaction between the holes in different orbitals and small hybridization of subbands were calculated at T = 160, 250, and 475 K.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Ryabinkina, L. I.; Рябинкина, Людмила Ивановна; Abramova, G. M.; Абрамова, Галина Михайловна; Romanova, O. B.; Романова, Оксана Борисовна; Vorotynov, A. M.; Воротынов, Александр Михайлович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Kiselev, N. I.; Balaev, A. D.; Балаев, Александр Дмитриевич

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10.

Ignatchenko, V. A.
Exchange narrowing of magnetic resonance linewidths in inhomogeneous ferromagnets / V. A. Ignatchenko, V. A. Felk // Phys. Rev. B. - 2005. - Vol. 71, Is. 9. - Ст. 94417, DOI 10.1103/PhysRevB.71.094417. - Cited References: 32 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
AMORPHOUS FERROMAGNETS
   RANDOM ANISOTROPY
   NANOCRYSTALLINE
   CRYSTALS
   ALLOYS
Кл.слова (ненормированные):
ferromagnetic material -- anisotropy -- article -- calculation -- correlation analysis -- crystal structure -- magnetism -- mathematical analysis -- nanotechnology -- nuclear magnetic resonance
Аннотация: The theory of exchange narrowing of ferromagnetic and spin-wave resonance linewidths in ferromagnets with the randomly inhomogeneous magnetic anisotropy is developed. The calculation is carried out by the method of averaged Green functions in the framework of the coherent potential approximation (CPA). One- and three-dimensional inhomogeneities with an arbitrary correlation wave number k(c) are considered (r(c)=k(c)(-1) is the correlation radius of the inhomogeneities). The method of the approximate solution of the CPA equation is proposed which has the quick convergence. Effects of exchange narrowing of the magnetic resonance lines and shifts of these lines are calculated in the whole region of the values of the correlation wave number k(c). The approximate analytical expressions for the linewidth of the FMR in the limiting cases of the small and large k(c) are obtained. Large narrowing of the FMR and spin-wave linewidths with the decrease of the correlation, radius of inhomogeneities is the substantiation. of the main advantage of nanocrystalline and amorphous materials over usual polycrystals when they are used at high frequency devices.

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Держатели документа:
RAS, SB, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
L. V. Kirensky Institute of Physics SB RAS, 660036, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Felk, V. A.; Игнатченко, Вальтер Алексеевич
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