Upper critical fields of the 3-K superconducting phase of Sr2RuO4
Upper critical fields of the 3-K superconducting phase of Sr2RuO4
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Sr2RuO4 3-K超导相的上临界场
DOI：
10.1143/jpsj.68.1651
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发表时间：
1999
影响因子：
1.7
通讯作者：
Y. Maeno
中科院分区：
文献类型：
--
作者：
Takashi Ando;T. Akima;Y. Mori;Y. Maeno
本文研究了Sr 2 RuO 4的正常态和超导态的超导性质，用金属钌的拉曼散射提高了转变温度Tc。与纯Sr 2 RuO 4（Tc = 1.5K）中金属导电的空间交叉相反，3-K相至少在300 K之前保持金属层间导电.我们将这种行为归因于通过Ru层的层间金属路径，由面内电流路径连接。对于超导性质，各向异性上临界场Hc 2（T）的相图表明，Hc 2// a B在低温区受到强烈抑制。磁场作用下的离面电阻率ρ c测量表明，纯Sr 2 RuO 4的有限剩余电阻率恢复到Hc 2（T）以上。这一结果证实了在3-K超导体中Tc = 1.5-K区域的增强超导电性的空间共存。此外，我们还观察到了海斯特...
We have investigated the normal-state and superconducting properties of the 3-K superconducting phase of Sr 2 RuO 4 with the enhanced transition temperature T c by lamellae of ruthenium metal. In contrast to the dimensional crossover in the metallic conduction in pure Sr 2 RuO 4 with T c = 1.5 K, the 3-K phase retains metallic interlayer conduction at least up to 300 K. We attribute this behavior to the interlayer metallic paths through the Ru lamellae, connected by in-plane current paths. For the superconducting properties, the phase diagram of the anisotropic upper critical fields H c2 ( T ) indicates that H c2// a b is strongly suppressed in the low-temperature region. The measurements of the out-of-plane resistivity ρ c under magnetic fields show that the finite residual resistivity recovers above H c2 ( T ) of pure Sr 2 RuO 4 . This result confirms the spatial coexistence of the enhanced superconductivity with the T c = 1.5-K region in the 3-K superconductor. In addition, we have also observed hyster...