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Universal Heat Transport in Sr2RuO4

M. Suzuki·M. A. Tanatar·N. Kikugawa·Z. Q. Mao·Y. Maeno·T. Ishiguro
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Abstract

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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M. Suzuki, M. A. Tanatar, N. Kikugawa, Z. Q. Mao, Y. Maeno, T. Ishiguro. 2002-08-04. Universal Heat Transport in Sr2RuO4. https://doi.org/10.1103/physrevlett.88.227004

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