Jie Xin, Jian-Bo Zhang, Gen-Da Gu, Alexander G. Gavriliuk, Igor Lyubutin, Viktor V. Struzhkin and Xiao-Jia Chen
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引用次数: 0
摘要
我们利用 X 射线衍射技术研究了晶格压缩对 Bi2Sr2CaCu2 超导体晶体结构的影响,该超导体的掺杂和过掺成分接近最佳值。我们的研究表明,在高压下(高达 30 GPa),掺杂水平不会影响这种超导体的晶体结构。与此同时,在与 Tc 开始降低的压力相对应的压力下,结构比例出现异常。这一事实表明,观察到的异常现象与超导性之间存在密切联系。我们还研究了掺杂和压力对 Tc(P) 以及 Bi2Sr2CaCu2 超导体的拉曼活性晶格模式的影响。我们发现,根据 Bi2Sr2CaCu2 样品的掺杂水平,从临界压力 Pc 开始,Tc 在 9 到 16 GPa 的范围内受到压力的普遍抑制。同时,我们在 10 到 20 GPa 附近观察到声子异常,这表明在 BiO 层中可能存在压力诱导的电荷再分布。这些新发现的反常现象可能与电子结构的变化有关,而电子结构的变化会与超导性产生竞争。
Structural and phonon anomalies in the superconducting with varying doping level at high pressures
We examined the effect of the lattice compression on the crystal structure of the Bi2Sr2CaCu2 superconductor with nearly optimally doped and overdoped composition using X-ray diffraction technique. Our studies show that at high pressures (up to 30 GPa ) the doping level does not affect the crystal structure of this superconductor. Along with this, structural anomalies in ratio appear at a pressure that corresponds to that at which Tc begins to decrease. This fact indicates a close connection between the observed anomalies and superconductivity. We also studied the effect of doping and pressure on the Tc(P) and on the Raman active lattice modes of the Bi2Sr2CaCu2 superconductors. We find universal suppression of the Tc by the pressure starting from the critical pressure Pc in the range from 9 to 16 GPa, depending on the doping level of the Bi2Sr2CaCu2 samples. Concomitantly, we observe phonon anomalies around 10 to 20 GPa, which indicate possible pressure-induced charge redistribution in BiO layers. These newly detected anomalies may be related to the changes in the electronic structure which compete with the superconductivity.
期刊介绍:
General physics – physics of elementary particles and fields – nuclear physics – atomic, molecular and optical physics – classical areas of phenomenology – physics of gases, plasmas and electrical discharges – condensed matter – cross-disciplinary physics and related areas of science and technology.
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