We report in-plane thermal conductivity along  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 language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Jan 19 2001|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics