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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G.
Заглавие : Effect of spin crossovers on the Mott-Hubbard transition at high pressures
Коллективы :
Место публикации : J. Exp. Theor. Phys.: Maik Nauka/Interperiodica/Springer, 2008. - Vol. 107, Is. 1. - P140-146. - ISSN 1063-7761, DOI 10.1134/S1063776108070145
Примечания : Cited References: 19. - The author is grateful to D. Homsky, G. Sawatzky, and M. Haverkort for fruitful discussions of results. This study was supported by the Russdian Foundation for Basic Research ( project no. 07-02-00226) and the Presidium of the Russian Academy of Sciences ( Program "Quantum Macrophysics"). This study was initiated during the author's work at the Kavli Institute for Theoretical Physics (University of California, Santa Barbara, USA) and supported by the NSF ( grant no. PHY05-51164).
Предметные рубрики: NARROW ENERGY BANDS
ELECTRONIC-STRUCTURE
MAGNETIC COLLAPSE
METAL COMPOUNDS
FEBO3
SPECTRA
GAPS
Ключевые слова (''Своб.индексиров.''): high pressures--mott hubbard transitions--spin crossovers--spin dynamics
Аннотация: The effect of spin crossovers in d (n) terms on the effective Hubbardparameter (U(eff)) determining the gap between the lower and upper Hubbard bands is analyzed using a many-electron approach to describe the electron structure of Mott insulators. A new mechanism of the insulator-metal transition is established for d(5) ions, which is related to a decrease in U(eff) caused by spin crossover. For other ions, the U (eff) value is either independent of pressure (d(2), d(4), d(7)) or it exhibits nonmonotonic growth (d(3), d(6), d(8)).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parker D., Dolgov O. V., Korshunov M. M., Golubov A. A., Mazin I. I.
Заглавие : Extended s(+/-) scenario for the nuclear spin-lattice relaxation rate in superconducting pnictides
Разночтения заглавия :авие SCOPUS: Extended sВ± scenario for the nuclear spin-lattice relaxation rate in superconducting pnictides
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2008. - Vol. 78, Is. 13. - Ст.134524. - ISSN 1098-0121, DOI 10.1103/PhysRevB.78.134524
Примечания : Cited References: 35
Предметные рубрики: IMPURITIES
SCATTERING
GAPS
Аннотация: Recently, several measurements of the nuclear spin-lattice relaxation rate T(1)(-1) in the superconducting Fe pnictides have been reported. These measurements generally show no coherence peak below T(c) and indicate a low-temperature power-law behavior, the characteristics commonly taken as evidence of unconventional superconductivity with lines of nodes crossing the Fermi surface. In this work we show that (i) the lack of a coherence peak is fully consistent with the previously proposed nodeless extended s(+/-)-wave symmetry of the order parameter (whether in the clean or dirty limit) and (ii) the low-temperature power-law behavior can be also explained in the framework of the same model but requires going beyond the Born limit.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Hammerath F., Drechsler S. L., Grafe H. J., Lang G., Fuchs G., Behr G., Eremin I., Korshunov M. M., Buchner B.
Заглавие : Unusual disorder effects in superconducting LaFeAs1-delta O0.9F0.1 as revealed by As-75 NMR spectroscopy
Коллективы :
Разночтения заглавия :авие SCOPUS: Unusual disorder effects in superconducting LaFeAs1-δ O0.9 F0.1 as revealed by 75As NMR spectroscopy
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2010. - Vol. 81, Is. 14. - Ст.140504. - ISSN 1098-0121, DOI 10.1103/PhysRevB.81.140504
Примечания : 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.
Предметные 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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