Universal Heat Transport in Sr2RuO4

Details Universal Heat Transport in Sr2RuO4 Universal Heat Transport in Sr2RuO4

2002-01-02

arxiv.org/abs/cond-mat/0201010v3

Physical Review Letters vol. 88, 227004 (2002)

Physics

Condensed Matter

Superconductivity

4 pages, 1 table, 2 figures

Scientific paper

10.1103/PhysRevLett.88.227004

We present the temperature dependence of the thermal conductivity kappa(T) of the unconventional superconductor Sr_2RuO_4 down to low temperatures (100 mK). In T -> 0 K limit we found a finite residual term in kappa/T, providing clear evidence for the superconducting state with an unconventional pairing. The residual term remains unchanged for samples with different T_c, demonstrating the universal character of heat transport in this spin-triplet superconductor. The low-temperature behavior of kappa suggests the strong impurity scattering with a phase shift close to pi/2. A criterion for the observation of universality is experimentally deduced.

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