Pauli-limited upper critical field in dirty d-wave superconductors

Vorontsov  AB; Vekhter  I; Graf  MJ

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Pauli-limited upper critical field in dirty d-wave superconductors

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We calculate the Pauli-limited upper critical field and the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) instability for dirty d-wave superconductors within the quasiclassical theory using the self-consistent (t) over cap- matrix approximation for impurities. We find that the phase diagram depends sensitively on the scattering rate and phase shift of nonmagnetic impurities. The transition into the superconducting state is always second order for weak (Born) scattering, while in the unitarity (strong) scattering limit a first-order transition into both uniform and spatially modulated superconducting states is stabilized. Contrary to general belief, we find that the FFLO phase is robust against disorder and survives impurity scattering equivalent to a T-c suppression of roughly 40. Our results bear on the search of FFLO states in heavy-fermion and layered organic superconductors.

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《Physical review, B. Condensed matter and materials physics》 |2008年第18期|180505-1-180505-4-0|共4页
作者
Vorontsov AB; Vekhter I; Graf MJ;
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作者单位

[Vorontsov, AB;

Vekhter, I] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA;

[Graf, MJ] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA;

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正文语种英语
中图分类固体物理学;
关键词
LARKIN-OVCHINNIKOV STATE; HEAVY-FERMION SUPERCONDUCTORS; INHOMOGENEOUS STATE; EXCHANGE FIELD; BIS(ETHYLENE-DITHIO)TETRATHIAFULVALENE; IMPURITIES; TRANSPORT;

Pauli-limited upper critical field in dirty d-wave superconductors

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