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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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Chubukov, A. V.
Theory of Raman response of a superconductor with extended s-wave symmetry: Application to the iron pnictides / A. V. Chubukov, I. . Eremin, M. M. Korshunov // Phys. Rev. B. - 2009. - Vol. 79, Is. 22. - Ст. 220501, DOI 10.1103/PhysRevB.79.220501. - 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." . - ISSN 1098-0121

РУБ Physics, Condensed Matter
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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Держатели документа:
[Chubukov, Andrey V.] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
[Eremin, Ilya
Korshunov, Maxim M.] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
[Eremin, Ilya] Tech Univ Carolo Wilhelmina Braunschweig, Inst Math & Theoret Phys, D-38106 Braunschweig, Germany
[Korshunov, Maxim M.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, United States
Max-Planck-Institut fur Physik Komplexer Systeme, D-01187 Dresden, Germany
Institute fur Mathematische und Theoretische Physik, TU Braunschweig, D-38106 Braunschweig, Germany
L. V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Physics Department, Kazan State University, 420008 Kazan, Russian Federation

Доп.точки доступа:
Eremin, I.; Korshunov, M. M.; Коршунов, Максим Михайлович; 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]
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