Evidence for unconventional superconductivity of Sr2RuO4 from specific-heat measurements
Evidence for unconventional superconductivity of Sr2RuO4 from specific-heat measurements
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DOI：
10.1143/jpsj.67.560
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发表时间：
1998-02
影响因子：
1.7
通讯作者：
S. Nishizaki;Y. Maeno;S. Farner;S. Ikeda;T. Fujita
中科院分区：
文献类型：
--
作者：
S. Nishizaki;Y. Maeno;S. Farner;S. Ikeda;T. Fujita
测量了非铜酸盐层状钙钛矿超导体Sr2RuO4单晶的比热.在1.2K以下，不同Tc的晶体表现出较大的剩余电子系数γ 0，并随Tc的增加而系统地减小。这种行为是一致的超导间隙中的节点的存在下，由于对杂质和缺陷的破坏与Tc的变化。然而，为了定量地解释观测到的大γ 0，我们需要引入额外的机制。
We measured the specific heat of single crystals of non-cuprate layered perovskite superconductor Sr 2 RuO 4 . The crystals with different T c up to 1.2 K exhibit a large residual electronic coefficient γ 0 , which decreases systematically with increasing T c . This behavior is consistent with the presence of nodes in the superconducting gap and with the variations of T c due to pair breaking by impurities and defects. To quantitatively account for the observed large γ 0 , however, we need to introduce additional mechanism.