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Uniaxial strain effects on the superconducting transition in Re-doped Hg-1223 cuprate superconductors

机译：单轴应变对掺Re Hg-1223铜酸盐超导体中超导转变的影响

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摘要

The effects of uniaxial strain and hydrostatic pressure on Hg_(0.83)Re_(0.18)Ba_2Ca_(2.4)Cu_(3.6)O_(14)[Hg_(0.83)(Re_(0.18))-1223] were investigated by ac magnetic measurements under stress corresponding to a pressure of 20 GPa at maximum. According to a previous thermal study based on the Ehrenfest relation, in-plane contraction should increase the superconducting transition temperature T_c,hereas out-of-plane contraction should decrease T_c. This suggests that the increase in T_c under hydrostatic-pressure contraction must be smaller than that under in-plane contraction. However, the present uniaxial-strain experiments revealed enhancement of T_c under both in-plane and out-of-plane contraction, and the largest enhancement was observed under hydrostatic-pressure contraction. According to a band calculation, all contraction styles induce hole doping from the HgO blocks to the CuO_2 blocks, and hydrostatic-pressure contraction yields the largest hole doping among three contractions. This behavior explains well a series of changes in T_c in the stress region of below 8 GPa. More specifically, under hydrostatic-pressure contraction, T_c exhibited an increase, a decrease, and another increase with increasing pressure, and this multistep change is similar to that observed in Bi-2223-type cuprate superconductors, suggesting that it is necessary to distinguish the effect of strain on the middle CuO_2 plane in the three-CuO_2-plane package from that on the outer planes.
机译：在交流磁场下，研究了单轴应变和静压力对Hg_（0.83）Re_（0.18）Ba_2Ca_（2.4）Cu_（3.6）O_（14）[Hg_（0.83）（Re_（0.18））-1223]的影响。最大压力对应于20 GPa的压力。根据先前基于埃伦菲斯特（Ehrenfest）关系的热学研究，面内收缩应增加超导转变温度T_c，而面外收缩应降低T_c。这表明静水压力收缩下的T_c的增加必须小于平面内收缩下的T_c的增加。然而，目前的单轴应变实验揭示了在平面内和平面外收缩下T_c的增强，并且在静水压力收缩下观察到最大的增强。根据能带计算，所有收缩方式都会引起从HgO嵌段到CuO_2嵌段的空穴掺杂，并且静水压力收缩产生三个收缩中最大的空穴掺杂。此行为很好地解释了在低于8 GPa的应力区域中T_c的一系列变化。更具体地说，在静水压力收缩下，T_c随压力增加呈现出增加，减少和另一增加，并且这种多步变化类似于在Bi-2223型铜酸盐超导体中观察到的变化，这表明有必要区分三层CuO_2平面封装中外层上的应变对中间CuO_2平面的影响。

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  • 来源
    《Physical review》 |2017年第6期|064503.1-064503.10|共10页
  • 作者

    Masaki Mito; Kazuma Ogata; Hiroki Goto; Kazuki Tsuruta; Kazuma Nakamura; Hiroyuki Deguchi; Tomoya Horide; Kaname Matsumoto; Takayuki Tajiri; Hiroshi Hara; Toshinori Ozaki; Hiroyuki Takeya; Yoshihiko Takano;

  • 作者单位

    Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan;

    Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan;

    Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan;

    Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan;

    Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan;

    Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan;

    Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan;

    Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan;

    Faculty of Science, Fukuoka University, Fukuoka 814-0180, Japan;

    National Institute for Materials Science, Tsukuba 305-0047, Japan;

    National Institute for Materials Science, Tsukuba 305-0047, Japan,School of Science and Technology. Kwansei Gakuin Universitv. Hyoeo 669-1337, Japan;

    National Institute for Materials Science, Tsukuba 305-0047, Japan;

    National Institute for Materials Science, Tsukuba 305-0047, Japan;

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