Thermal conductivity of superconducting Sr2RuO4 in oriented magnetic fields

M. A. Tanatar, S. Nagai, Zhiqiang Mao, Y. Maeno, T. Ishiguro

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Abstract

We report in-plane thermal conductivity along [100] direction, k100, of high quality single crystals (Tc = 1.44 K) of unconventional superconductor Sr2RuO4. Measurements were performed as a function of temperature T and magnetic fields H of various orientations. Linear decrease of k100/T in T in zero field is found below 1 K, in contrast to nearly constant value in the normal state. Field dependence of k100/T at 0.3 K in H perpendicular to the plane is qualitatively similar to that for a line-node superconducting state in the low temperature limit. The dependence gives μ0Hc1≈8 mT and μ0Hc2≈60 mT. In the in-plane fields, the field dependence at low temperatures shows a notable difference from the perpendicular field case. The temperature and field domain of this anomalous behavior is consistent with the existence of another superconducting phase, as proposed recently.

Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume63
Issue number6
DOIs
StatePublished - Jan 19 2001

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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