Temperature dependence of the penetration depth in Sr2RuO4: evidence for nodes in the gap function
Temperature dependence of the penetration depth in Sr2RuO4: evidence for nodes in the gap function
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DOI：
10.1103/physrevlett.85.4775
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发表时间：
2000-11
影响因子：
8.6
通讯作者：
I. Bonalde;B. Yanoff;M. Salamon;D. Harlingen;E. M. E. Chia-E.-M.-E.-Chia-2256013176;Zhiqiang Mao;Y. Maeno
中科院分区：
文献类型：
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作者：
I. Bonalde;B. Yanoff;M. Salamon;D. Harlingen;E. M. E. Chia-E.-M.-E.-Chia-2256013176;Zhiqiang Mao;Y. Maeno
We report measurements of the magnetic penetration depth in single crystals of Sr2RuO4 down to 0.04 K using a tunnel-diode based, self-inductive technique. We observe a power law temperature dependence below 0.8 K, with no sign of a second phase transition nor of a crossover predicted for a multiband superconductor. A power law dependence suggests that the gap function has nodes, inconsistent with candidate p-wave states. We argue that nonlocal effects, rather than impurity scattering, can explain the observed T2 dependence instead of the T-linear behavior expected for line nodes.
