Single-gap s-wave superconductivity in Cu$_x$TiSe$_2$

S. Y. Li; Louis Taillefer; G. Wu; X. H. Chen

paper

Single-gap s-wave superconductivity in Cu $_{x}$ TiSe $_{2}$

arXiv:cond-mat/0701669

Abstract

The in-plane thermal conductivity $κ$ of the layered superconductor Cu $_{x}$ TiSe $_{2}$ was measured down to temperatures as low as $T_{c}$ /40, at $x$ = 0.06 near where the CDW order vanishes. The absence of a residual linear term at $T \to 0$ is strong evidence for conventional s-wave superconductivity in this system. This is further supported by the slow magnetic field dependence, also consistent with a single gap, of uniform magnitude across the Fermi surface. Comparison with the closely related material NbSe $_{2}$ , where the superconducting gap is three times larger on the Nb 4 $d$ band than on the Se 4 $p$ band, suggests that in Cu $_{0.06}$ TiSe $_{2}$ the Se 4 $p$ band is below the Fermi level and the Ti 3 $d$ band is alone responsible for the superconductivity.

4 pages, 4 figures

Single-gap s-wave superconductivity in Cux​TiSe2​

Abstract

Single-gap s-wave superconductivity in Cu $_{x}$ TiSe $_{2}$