Using controlled disorder to distinguish s± and s++ gap structure in Fe-based superconductors

被引：84

作者：

Wang, Y. ^{[1
]}

Kreisel, A. ^{[1
]}

Hirschfeld, P. J. ^{[1
]}

Mishra, V. ^{[2
]}

机构：

[1] Univ Florida, Dept Phys, Gainesville, FL 32611 USA

[2] Argonne Natl Lab, Div Mat Sci, Lemont, IL 60439 USA

来源：

PHYSICAL REVIEW B | 2013年 / 87卷 / 09期

关键词：

S-WAVE SUPERCONDUCTORS; DENSITY-OF-STATES; IMPURITY SCATTERING; PENETRATION DEPTH;

D O I：

10.1103/PhysRevB.87.094504

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We reconsider the effect of disorder on the properties of a superconductor characterized by a sign-changing order parameter appropriate for Fe-based materials. Within a simple two-band model, we calculate simultaneously T-c, the change in residual resistivity Delta(rho 0), and the zero-energy density of states, and show how these results change for various types of gap structure and assumptions regarding the impurity scattering. The rate of T-c suppression is shown to vary dramatically according to details of the impurity model considered. We search therefore for a practical, experimentally oriented signature of a gap of the s(perpendicular to) type, and propose that observation of a particular evolution of the penetration depth, nuclear magnetic resonance relaxation rate, or thermal conductivity temperature dependence with disorder would suffice. DOI: 10.1103/PhysRevB.87.094504

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页数：6

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