Nodeless superconductivity in Ca3Ir4Sn13: evidence from quasiparticle heat transport

Details Nodeless superconductivity in Ca3Ir4Sn13: evidence from quasiparticle heat transport Nodeless superconductivity in Ca3Ir4Sn13: evidence from quasiparticle heat transport

2012-02-23

arxiv.org/abs/1202.5164v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

We report thermal conductivity measurements down to 50 mK on Ca$_3$Ir$_4$Sn$_{13}$ single crystals, in which superconductivity with $T_c \approx 7$ K was claimed to coexist with ferromagnetic spin-fluctuations. In zero magnetic field, no residual linear term $\kappa_0/T$ is found. In low magnetic fields, $\kappa_0(H)/T$ shows a slow field dependence. These results demonstrate that the superconducting gap of Ca$_3$Ir$_4$Sn$_{13}$ is nodeless, thus rule out an exotic nodal gap caused by ferromagnetic spin-fluctuations. The relatively fast increase of $\kappa_0(H)/T$ near the upper critical field $H_{c2}$ may result from gap anisotropy, or multiple isotropic gaps with different magnitudes.

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