First-order superconducting transition of Sr2RuO4.
First-order superconducting transition of Sr2RuO4.
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DOI：
10.1103/physrevlett.110.077003
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发表时间：
2012-12
影响因子：
8.6
通讯作者：
S. Yonezawa;T. Kajikawa;Y. Maeno
中科院分区：
文献类型：
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作者：
S. Yonezawa;T. Kajikawa;Y. Maeno
通过磁热效应，我们研究了Sr(2)RuO(4)的超导正态（S-N）跃迁的性质，Sr(2)RuO(4)是最有希望成为自旋三重态超导体的候选者。我们提供的热力学证据表明，这种氧化物的S-N跃迁是一阶的，低于大约0.8 K，并且只有在非常接近导电平面的磁场方向上，这与普通ii型超导体表现出二阶S-N跃迁形成鲜明对比。在0.2 K时，整个跃迁的熵释放是正常状态熵的10%。我们的研究结果促使我们引入一种利用磁场打破超导性的新机制。
By means of the magnetocaloric effect, we examine the nature of the superconducting-normal (S-N) transition of Sr(2)RuO(4), a most promising candidate for a spin-triplet superconductor. We provide thermodynamic evidence that the S-N transition of this oxide is of first order below approximately 0.8 K and only for magnetic field directions very close to the conducting plane, in clear contrast to the ordinary type-II superconductors exhibiting second-order S-N transitions. The entropy release across the transition at 0.2 K is 10% of the normal-state entropy. Our result urges an introduction of a new mechanism to break superconductivity by magnetic field.