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arXiv 1406.4640cond-mat.supr-concond-mat.str-el
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Sr2RuO4中一级超导转变的Specific-heat证据

Specific-heat evidence of the first-order superconducting transition in Sr2RuO4

Shingo Yonezawa, Tomohiro Kajikawa, Yoshiteru Maeno

摘要:

我们研究了超纯Sr_2RuO_4单晶的比热,Sr_2RuO_4是自旋三重态超导体的主要候选者。我们第一次获得比热证据的一级超导转变低于0.8 K,即发散状峰和明确的滞后比热在上临界场。一阶过渡发生在所有的面内场方向。一阶过渡的比热特征被发现是高度敏感的样品质量,特别是,滞后变得完全不存在的样品质量稍低。这些热力学观测结果为理解一级跃迁的非常规对断裂效应提供了重要的基础。

英文摘要:

We investigate the specific heat of ultra-pure single crystals of Sr2RuO4, a leading candidate of a spin-triplet superconductor. We for the first time obtained specific-heat evidence of the first-order superconducting transition below 0.8 K, namely divergent-like peaks and clear hysteresis in the specific heat at the upper critical field. The first-order transition occurs for all in-plane field directions. The specific-heat features for the first-order transition are found to be highly sensitive to sample quality; in particular, the hysteresis becomes totally absent in a sample with slightly lower quality. These thermodynamic observations provide crucial bases to understand the unconventional pair-breaking effect responsible for the first-order transition.

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