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Universal Heat Transport in Sr2RuO4

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arxiv cond-mat/0201010 v3 pith:XN4LOGLF submitted 2002-01-02 cond-mat.supr-con

Universal Heat Transport in Sr2RuO4

M. Suzuki , M.A. Tanatar , N. Kikugawa , Z.Q. Mao , Y. Maeno , T. Ishiguro This is my paper
classification cond-mat.supr-con
keywords kappaheatresidualsuperconductortermtransportunconventionaluniversal
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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