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arXiv 1702.08829cond-mat.supr-con
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高压研究中Sr0.1Bi2Se 3中常规超导性的证据

Evidence for conventional superconductivity in Sr0.1Bi2Se3 from high pressure studies

K. Manikandan, Shruti, P. Neha, V. Maurya, G. Kalai Selvan, B. Wang, Y. Uwatoko, K. Ishigaki, R. Jha, V. P. S. Awana, S. Arumugam, S. Patnaik

摘要:

SrxBi_2Se_3是最近报道的由拓扑绝缘体Bi_2Se_3衍生的超导体。它示出了在环境压力下的3.25 K的最大电阻Tc。我们报告的磁性(高达1 GPa)和输运性质(upro 8 GPa)的压力下的单晶Sr 0.1Bi 2Se 3超导体。磁性测量表明,Tc从~2.6 K(0 GPa)下降到~1.9 K(0.81 GPa)。在正常状态电阻率的金属特性没有太大变化的情况下,在输运性质中也观察到类似的行为。在高压下没有观察到重入超导相(Physical Review B 93,144514(2016))。用费米液体模型解释了Tc附近的正常态电阻率。在100 K以上,表明存在具有两个平行电流通道的极化子跳跃导电机制。能带结构计算表明费米能级的态密度随压力的增加而减小。与传统BCS低Tc超导体中的转变温度抑制相一致,SrxBi_2Se_3中的压力效应很好地解释为压力引起的能带展宽。

英文摘要:

SrxBi2Se3 is recently reported to be a superconductor derived from topological insulator Bi2Se3. It shows a maximum resistive Tc of 3.25 K at ambient pressure. We report magnetic (upto 1 GPa) and transport properties (upro 8 Gpa) under pressure for single crystalline Sr0.1Bi2Se3 superconductor. Magnetic measurements show that Tc decreases from ~2.6 K (0 GPa) to ~1.9 K (0.81 GPa). Similar behavior is observed in transport properties as well without much change in the metallic characteristics in normal state resistivity. No reentrant superconducting phase (Physical Review B 93, 144514 (2016)) is observed at high pressure. Normal state resistivity near Tc is explained by Fermi liquid model. Above 100 K, a polaronic hopping conduction mechanism with two parallel channels for current flow is indicated. Band structure calculations indicate decreasing density of states at Fermi level with pressure. In consonance with transition temperature suppression in conventional BCS low Tc superconductors, the pressure effect in SrxBi2Se3 is well accounted by pressure induced band broadening.

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