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Unusual disorder effects in superconducting LaFeAs1-delta O0.9F0.1 as revealed by As-75 NMR spectroscopy / F. . Hammerath [et al.] // Phys. Rev. B. - 2010. - Vol. 81, Is. 14. - Ст. 140504, DOI 10.1103/PhysRevB.81.140504. - Cited References: 52. - This work has been supported by the DFG, through FOR 538, SPP 1458 and Contract No. Be1749/12. G. L. acknowledges support from the A. v. Humboldt-Stiftung. M. M. K. acknowledges support from RFBR under Grant No. 09-02-00127, RAS program on "Low temperature quantum phenomena" and President of Russia MK-1683.2010.2. S. L. D. thanks H. Kontani, K. Kuroki, K. Kikoin, and M. Kulic for useful discussions. . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
GAPS
   BA0.6K0.4FE2AS2
   RELAXATION
   SCATTERING
Аннотация: We report As-75 nuclear magnetic resonance measurements of the spin-lattice relaxation in the superconducting (SC) state of LaFeAsO0.9F0.1 and As-deficient LaFeAs1-delta O0.9F0.1. The temperature behavior of 1/T-1 below T-c changes drastically from a T-3 dependence for LaFeAsO0.9F0.1 to a T-5 dependence for the As-deficient sample. These results, together with the previously reported unexpected increase in Tc and the slope of the upper critical field near Tc for the As-deficient sample, are discussed in terms of nonuniversal SC gaps in Fe pnictides and the effect of As deficiency as an exotic case where nonmagnetic "smart" impurities even stabilize an s(+/-)-wave superconductor or within a scenario of a disorder-driven change to s(++) superconductivity.

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Держатели документа:
Inst Solid State Res, D-01171 Dresden, Germany
Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Institute for Solid State Research, IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany
Max-Planck-Institut fur Physik Komplexer Systeme, D-01187 Dresden, Germany
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Department of Physics, University of Florida, Gainesville, FL 32611, United States

Доп.точки доступа:
Hammerath, F.; Drechsler, S. L.; Grafe, H. J.; Lang, G.; Fuchs, G.; Behr, G.; Eremin, I.; Korshunov, M. M.; Коршунов, Максим Михайлович; Buchner, B.
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    Two-Magnon Relaxation Processes in Nanocrystalline Thin Magnetic Films / A. V. Izotov [et al.] // Russ. Phys. J. - 2019. - Vol. 61, Is. 12. - P. 2313-2320, DOI 10.1007/s11182-019-01673-4. - Cited References: 25. - This research was done with support of the Russian Ministry of Education and Science, task No. 3.1031.2017/PCh. . - ISSN 1064-8887. - ISSN 1573-9228
Рубрики:
FERROMAGNETIC-RESONANCE LINEWIDTH
   MICROMAGNETIC CALCULATION
   SCATTERING
Кл.слова (ненормированные):
micromagnetic simulation -- nanocrystallites -- random magnetic anisotropy -- ferromagnetic resonance -- microwave frequencies -- two-magnon relaxation process
Аннотация: Numerical analysis of the micromagnetic model was used to reveal the ‘resonance’ feature of relaxation processes in nanocrystalline thin magnetic films. This feature manifests itself in the form of sharp broadening of the ferromagnetic resonance (FMR) line at a certain frequency f1 depending on magnetic characteristics of the film, and is observed only in films the thickness of which exceeds some threshold value dmin. Sharp broadening of the FMR line is accompanied by significant shift of the resonance field, whereas the shift value changes the sign at frequency ~ f1. It was shown analytically that the nature of observed effects is associated with the two-magnon process of spin waves scattering on quasi-periodic magnetic microstructure – magnetization ‘ripple’. Obtained expressions for the threshold value of film thickness dmin and frequency of maximum broadening of FMR line f1 agree well with the results of numerical computation of micromagnetic model.

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Публикация на русском языке Особенности двухмагнонных процессов релаксации в нанокристаллических тонких магнитных пленках [Текст] / А. В. Изотов [и др.] // Изв. вузов. Физика. - 2018. - Т. 61 № 12. - С. 153-159

Держатели документа:
Siberian Fed Univ, Krasnoyarsk, Russia.
Russian Acad Sci, Kirensky Inst Phys, Fed Res Ctr KSC, Siberian Branch, Krasnoyarsk, Russia.

Доп.точки доступа:
Izotov, A. V.; Изотов, Андрей Викторович; Belyaev, B. A.; Беляев, Борис Афанасьевич; Solovev, P. N.; Соловьев, Платон Николаевич; Boev, N. M.; Боев, Никита Михайлович; Russian Ministry of Education and Science [3.1031.2017/PCh]
}
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Transport properties of HTSC plus Ba(Pb, Met)O-3 composites as functions of the electrical and magnetic characteristics of nonsuperconducting components / M. I. Petrov [et al.] // Phys. Solid State. - 2000. - Vol. 42, Is. 5. - P. 810-815, DOI 10.1134/1.1131294. - Cited References: 27 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   CURRENT-VOLTAGE CHARACTERISTICS
   NORMAL-METAL LAYER
   WEAK LINKS
   JUNCTIONS
   SCATTERING
   BAPB1-XBIXO3
   TRANSITION
   IMPURITIES
   BREAKING
Аннотация: Composites simulating a network of weak metallic links and consisting of a classic 1-2-3 HTSC and a BaPbO3 metal oxide with incorporated Sn, Ni, and Fe impurities have been prepared. Experimental resistivity, magnetic, and Mossbauer studies of the BaPb(0.9)Met(0.1)O(3) nonsuperconducting components are presented. The transport properties of the HTSC + BaPb(0.9)Met(0.1)O(3) composites have been investigated. The superconducting properties of the composites are observed to be suppressed, both when the carrier mean free path in nonsuperconducting components with tin impurities decreases, and as a result of an additional interaction of the magnetic moments of (Fe, Ni) impurities with the spins of supercurrent carriers. The experimental temperature dependences of the composite critical current are analyzed in terms of the de Gennes theory for the superconductor-normal metal-superconductor structures. (C) 2000 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Petrov, M. I.; Петров, Михаил Иванович; Balaev, D. A.; Балаев, Дмитрий Александрович; Ospishchev, S. V.; Оспищев С. В.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
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The effect of paramagnetic impurities in normal metal on the critical current in a network of S-N-S Josephson junctions in bulk Y3/4Lu1/4Ba2Cu3O7+BaPb(1-x)Fe(x)O(3)composites / D. A. Balaev [et al.] // Supercond. Sci. Technol. - 2003. - Vol. 16, Is. 1. - P. 60-64, DOI 10.1088/0953-2048/16/1/311. - Cited References: 41 . - ISSN 0953-2048

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
CURRENT-VOLTAGE CHARACTERISTICS
   WEAK LINKS
   RESISTIVE PROPERTIES
   MAGNETIC-IMPURITIES
   EXCHANGE FIELD
   SNS JUNCTIONS
   F-S
   COMPOSITES
   SUPERCONDUCTOR
   SCATTERING
Кл.слова (ненормированные):
Critical currents -- Interfaces (materials) -- Josephson junction devices -- Paramagnetism -- Transport properties -- Non-superconducting ingredient -- Paramagnetic impurities -- Superconductor normal metal superconductor -- Oxide superconductors
Аннотация: Bulk Y3/4Lu1/4Ba2Cu3O7 + BaPb1-xFexO3 composites representing a model of a network of superconductor-normal metal-superconductor (SNS) Josephson junctions with paramagnetic impurities (Fe) in the N layers have been prepared. The transport properties of the composites have been studied. An exponential decay of the critical current with increasing Fe content in the non-superconducting ingredient of the composite has been observed. Such a behaviour is accounted for in terms of the de Gennes proximity effect theory.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Ospishchev, S. V.; Petrov, M. I.; Петров, Михаил Иванович; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
}
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Temperature evolution of the hysteresis in the current-voltage characteristic of a polycrystalline high-temperature superconductor with 1-2-3 structure / M. I. Petrov [et al.] // Phys. Solid State. - 2002. - Vol. 44, Is. 7. - P. 1229-1234, DOI 10.1134/1.1494614. - Cited References: 38 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
WEAK LINKS
   ANDREEV REFLECTIONS
   SIMPLIFIED MODEL
   EXCESS CURRENT
   SNS JUNCTIONS
   SCATTERING
   COMPOSITES
   TRANSPORT
Аннотация: The temperature evolution of the current-voltage (I-U) characteristic of a contact of the break-junction type with direct conduction is investigated on a polycrystalline HTSC of the Y-Ba-Cu-O system. The experimental I-U characteristics possessing a hysteresis are correctly described in the framework of the Kummel-Nicolsky theory for an S-N-S contact (S stands for a superconductor; N, for a normal metal) in which the Andreev reflection of quasiparticles from the N-S interface is considered. It is shown that the shape of the I-U curve, as well as the existence of a hysteresis, is determined by the ratio of the number of "long" and "short" intergranular boundaries in the polycrystal under investigation. The coincidence of the calculated and experimental I-U curves made it possible to estimate the effective length of "natural" intergranular boundaries in polycrystalline HTSC materials. The estimate is obtained from the experimental temperature dependence of the critical current in the sample under investigation. (C) 2002 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia

Доп.точки доступа:
Петров, Михаил Иванович; Petrov, M. I.; Balaev, D. A.; Балаев, Дмитрий Александрович; Gokhfel'd, D. M.; Гохфельд, Денис Михайлович; Шайхутдинов, Кирилл Александрович; Shaikhutdinov, K. A.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
}
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Soft-mode condensation in Raman spectra of the Rb2KScF6 elpasolite / A. N. Vtyurin [et al.] // Phys. Solid State. - 2001. - Vol. 43, Is. 11. - P. 2154-2157, DOI 10.1134/1.1417197. - Cited References: 11 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
STRUCTURAL PHASE-TRANSITION
SCATTERING
Аннотация: This paper reports on the first observation of soft-mode condensation in the Raman spectra of the Rb2KScF6 elpasolite crystal below the transition points from the cubic to tetragonal and, subsequently, monoclinic phase. (C) 2001 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, Kirenskii Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
Univ Maine, F-72085 Le Mans, France
ИФ СО РАН
Kirenskii Inst. of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Universite du Maine, Le Mans, Cedex 9, 72085, France

Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Bulou, A.; Krylov, A. S.; Крылов, Александр Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич
}
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Sobol, A. A.
Raman spectroscopy of SrB4O7 single crystals in the temperature range 300–1273 K / A. A. Sobol, V. E. Shukshin, A. I. Zaitsev // Opt. Spectrosc. - 2016. - Vol. 121, Is. 1. - P. 25-31, DOI 10.1134/S0030400X16070201. - Cited References: 20. - This work was supported by the Russian Foundation for Basic Research, project no. 13-02-00707a. . - ISSN 0030-400X

РУБ Optics + Spectroscopy
Рубрики:
STRONTIUM TETRABORATE
   PHASE-TRANSITIONS
   SCATTERING
   SPECTRA
Аннотация: The polarized Raman spectra of SrB4O7 (SBO) single crystals are studied in detail in the temperature range of 300–1273 K. The TO, LO, and IO phonon lines of A1, A2, B1, and B2 symmetries of rhombic SBO at 300 K are identified. The behavior of the Raman spectra of SBO crystals is studied upon heating up to their melting. The relation of Raman spectra with the structure of boron–oxygen fragments, as well as the transformation of spectra in the process of melting of SBO crystals, is discussed. © 2016, Pleiades Publishing, Ltd.

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Публикация на русском языке Соболь А. А. Спектроскопия комбинационного рассеяния света в монокристаллах SrB4O7 в интервале температур 300–1273 K [Текст] / А. А. Соболь, В. Е. Шукшин, А. И. Зайцев // Оптика и спектроскопия : Наука, 2016. - Т. 121 № 1. - С. 28-35

Держатели документа:
Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow, Russian Federation
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Shukshin, V. E.; Zaitsev, A. I.; Зайцев, Александр Иванович
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Shneyder, E. I.
Phonon and magnetic pairing mechanisms in high-temperature superconductors in the strong correlation limit / E. I. Shneyder, S. G. Ovchinnikov // JETP Letters. - 2006. - Vol. 83, Is. 9. - P. 394-398, DOI 10.1134/S0021364006090062. - Cited References: 22 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
BAND HUBBARD-MODEL
   ELECTRON
   SCATTERING
   SPECTRUM
Аннотация: The t-t'-t"-J* model of electrons interacting with three phonon modes (breathing, apical breathing, and buckling) is considered. The wave-vector dependence of the matrix elements of the electron-phonon interaction leads to opposite contributions to the pairing potential with the d(x2-y2) symmetry: the buckling mode facilitates electron pairing, while the breathing mode suppresses it. As a result, the critical temperature of La2-xSrxCuO4 that is associated with the magnetic mechanism is lowered when phonons are taken into account.

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Держатели документа:
Russian Acad Sci, Kirenskii Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660062, Russia
ИФ СО РАН

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Шнейдер, Елена Игоревна
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Selective excitation of E-1(LO) and A(1)(LO) phonons with large wave vectors in the Raman spectra of hexagonal InN / V. Y. Davydov [et al.] // Phys. Rev. B. - 2009. - Vol. 80, Is. 8. - Ст. 81204, DOI 10.1103/PhysRevB.80.081204. - Cited References: 15. - We are thankful to B. N. Mavrin and A. N. Vtyurin for the arrangement NIR measurements and S. A. Permogorov for the critical reading of the manuscript. This work was supported by RFBR (Grant No. 09-02-01280), NSC-RFBR (Grant No. 08-02-92003-HHC), and the Program of RAS "New materials and structures." . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
SCATTERING
RESONANCE
Кл.слова (ненормированные):
III-V semiconductors -- indium compounds -- phonon dispersion relations -- Raman spectra -- wide band gap semiconductors
Аннотация: It is shown that dispersions of E-1(LO) and A(1)(LO) modes of InN can be restored in a wide interval of wave vectors by studying impurity-induced first-order Raman scattering as a function of exciting light energy. It is also shown that due to the resonance character of scattering the observed phonon energies correspond to the wave vectors strictly defined by exciting photon energies. The frequencies of E-1(LO) and A(1)(LO) phonons at the Gamma point obtained by extrapolation to zero wave vectors were found to be 604 and 592 cm(-1), respectively.

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Держатели документа:
[Davydov, V. Yu.
Klochikhin, A. A.
Smirnov, A. N.
Strashkova, I. Yu.] AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia
[Klochikhin, A. A.] Inst Nucl Phys, St Petersburg 350000, Russia
[Krylov, A. S.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Lu, Hai
Schaff, William J.] Cornell Univ, Dept Elect & Comp Engn, Ithaca, NY 14853 USA
[Lee, H. -M.
Hong, Y. -L.
Gwo, S.] Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan
ИФ СО РАН
Ioffe Physical-Technical Institute, 194021 St. Petersburg, Russian Federation
Nuclear Physics Institute, 350000 St. Petersburg, Russian Federation
Kirensky Institute of Physics, 60036 Krasnoyarsk, Russian Federation
Department of Electrical and Computer Engineering, Cornell University, Ithaca, NY 14853, United States
Department of Physics, National Tsing-Hua University, Hsinchu 30013, Taiwan

Доп.точки доступа:
Davydov, V. Yu.; Klochikhin, A. A.; Smirnov, A. N.; Strashkova, I. Y.; Krylov, A. S.; Крылов, Александр Сергеевич; Lu, H.; Schaff, W. J.; Lee, H. M.; Hong, Y. L.; Gwo, S.; RFBR [09-02-01280]; NSC-RFBR [08-02-92003-HHC]
}
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10.

Sadreev, A. F.
Feshbach projection formalism for transmission through a time-periodic potential / A. F. Sadreev // Phys. Rev. E. - 2012. - Vol. 86, Is. 5. - Ст. 56211, DOI 10.1103/PhysRevE.86.056211. - Cited References: 33 . - ISSN 1539-3755

РУБ Physics, Fluids & Plasmas + Physics, Mathematical
Рубрики:
NUCLEAR REACTIONS
   UNIFIED THEORY
   QUANTUM
   FIELD
   SCATTERING
   SYSTEM
   STATES
Аннотация: The Feshbach projection formalism is applied to consider quantum transmission through a tight-binding wire subject to a time-periodic potential. The wire is coupled with two leads via the coupling constant v(C). The periodicity of the potential implies an additional temporal dimension that reduces the problem to stationary transmission through an effectively two-dimensional lattice system. The non-Hermitian effective Hamiltonian is formulated. Thist allows us to trace the redistribution of resonance positions and resonance widths with the growth of v(C) from the weak-coupling to the strong-coupling regime.

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Доп.точки доступа:
Садреев, Алмаз Фаттахович
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