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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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chubukov A. V., Eremin I., Korshunov M. M.
Заглавие : Theory of Raman response of a superconductor with extended s-wave symmetry: Application to the iron pnictides
Коллективы : NSF [DMR 0604406]; Asian-Pacific Center for Theoretical Physics; Volkswagen Foundation [I/82203]; RMHE Program "Development of scientific potential" [N1 2.1.1/298.5]; RFBR [09-02-00127]
Разночтения заглавия :авие SCOPUS: Theory of Raman response of a superconductor with extended s -wave symmetry: Application to the iron pnictides
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2009. - Vol. 79, Is. 22. - Ст.220501. - ISSN 1098-0121, DOI 10.1103/PhysRevB.79.220501
Примечания : Cited References: 48. - We acknowledge useful conversations with G. Blumberg, W. Brenig, H.-Y. Choi, D. V. Efremov, A. Sacuto, M. Vavilov, and A. Vorontsov. A. V. C. acknowledges support from NSF (Contract No. NSF-DMR 0604406). I. E. acknowledges partial support from the Asian-Pacific Center for Theoretical Physics, the Volkswagen Foundation (Contract No. I/82203), and the RMHE Program "Development of scientific potential" (Contract No. N1 2.1.1/298.5). M. M. K. acknowledges support from RFBR (Grant No. 09-02-00127) and RAS program on "Low temperature quantum phenomena."
Предметные рубрики: LAYERED SUPERCONDUCTOR
SCATTERING
BA0.6K0.4FE2AS2
Аннотация: We argue that Raman study of Fe-pnictides is a way to unambiguously distinguish between various superconducting gaps proposed for these materials. We show that A(1g) Raman intensity develops a true resonance peak below 2 Delta if the pairing gap has A(1g) symmetry in the folded Brillouin zone (Delta(k=0)=Delta, Delta(pi, pi)=-Delta). No such peak develops for a pure s-wave gap, a d-wave gap, and an extended s-wave gap with Delta(k) =Delta cosk(x)/2cosk(y)/2. We show that the peak remains quite strong for the values of interpocket impurity scattering used to fit NMR data.
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