Anomalous Temperature Dependence of Lower Critical Field in Ultraclean URu2Si2
Anomalous Temperature Dependence of Lower Critical Field in Ultraclean URu2Si2
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超净 URu2Si2 中下临界场的反常温度依赖性
DOI：
10.1143/jpsj.79.084705
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
and Y. Matsuda
中科院分区：
文献类型：
--
作者：
R. Okazaki;M. Shimozawa;H;Shishido;M. Konczykowski;Y. Haga;T. D. Matsuda;Y. Onuki;Y. Yanase;T. Shibauchi;and Y. Matsuda
To investigate a mysterious superconducting state of URu2Si2embedded in the so-called hidden order state, the lower critical fieldHc1is precisely determined down to 55 mK forH∥aandH∥c. For this purpose, the positional dependence of the local magnetic induction is measured on ultraclean single crystals (Tc= 1.4 K) with residual resistivity ratio exceeding 700. We find that the temperature dependence ofHc1significantly differs from that of any other superconductors. The wholeHc1(T) forH∥aare well explained by the two superconducting gap structures with line and point nodes, which have been suggested by the recent thermal conductivity and specific heat measurements. On the other hand, forH∥c, a change of slope with a distinct kink inHc1(T), which cannot be accounted for by two gaps, is observed. This behavior forH∥csharply contrasts with the cusp behavior ofHc1(T) associated with a transition into another superconducting phase found in UPt3and U1-xThxBe13. The observed anomalous low-field diamagnetic response is possibly related to a peculiar vortex dynamics associated with chiral domains due to the multicomponent superconducting order parameter with broken time reversal symmetry.
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