Superconducting Gap Structure of LaFePO Studied by Thermal Conductivity

Details Superconducting Gap Structure of LaFePO Studied by Thermal Conductivity Superconducting Gap Structure of LaFePO Studied by Thermal Conductivity

2009-06-03

arxiv.org/abs/0906.0622v1

Phys. Rev. B 80, 220509(R) (2009)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.80.220509

The superconducting gap structure of LaFePO ($T_c=7.4 $K) is studied by thermal conductivity ($\kappa$) at low temperatures in fields $H$ parallel and perpendicular to the c axis. A clear two-step field dependence of $\kappa(H)$ with a characteristic field $H_s(\sim 350$ Oe) much lower than the upper critical field $H_{c2}$ is observed. In spite of large anisotropy of $H_{c2}$, $\kappa(H)$ in both $H$-directions is nearly identical below $H_s$. Above $H_s$, $\kappa(H)$ grows gradually with $H$ with a convex curvature, followed by a steep increase with strong upward curvature near $H_{c2}$. These results indicate the multigap superconductivity with active two-dimensional (2D) and passive 3D bands having contrasting gap values. Together with the recent penetration depth results, we suggest that the 2D bands consist of nodal and nodeless ones, consistent with the extended s-wave symmetry.

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