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arXiv 1107.1341cond-mat.supr-con
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压力对YBa2Cu3Ox磁穿透深度影响的μ子自旋转动研究

Muon spin rotation investigation of the pressure effect on the magnetic penetration depth in YBa2Cu3Ox

A. Maisuradze, A. Shengelaya, A. Amato, E. Pomjakushina, H. Keller

摘要:

用μ子自旋旋转(muSR)方法研究了不同氧浓度x = 6.45,6.6,6.8和6.98的YBa_2Cu_3Ox多晶样品中磁穿透深度与压力的关系.超流密度(ps)与超导转变温度Tc的关系偏离通常的Uemura线。(dTc/dP)/(dp_s/dP)比Uemura关系式小2倍。在欠掺杂样品中,零温超导能隙和BCS比均随外流体静压的增加而增加,说明耦合强度随压力的增加而增加。文中还讨论了压力效应和氧同位素效应与磁穿透深度的关系。为了可靠地分析压力池中具有强磁矩的样品的muSR谱,开发并应用了一种特殊的模型。

英文摘要:

The pressure dependence of the magnetic penetration depth in polycrystalline samples of YBa2Cu3Ox with different oxygen concentrations x = 6.45, 6.6, 6.8, and 6.98 was studied by muon spin rotation (muSR). The pressure dependence of the superfluid density (p_s) as a function of the superconducting transition temperature Tc is found to deviate from the usual Uemura line. The ratio (dTc/dP)/(dp_s/dP) is factor of 2 smaller than that of the Uemura relation. In underdoped samples, the zero temperature superconducting gap and the BCS ratio both increase with increasing external hydrostatic pressure, implying an increase of the coupling strength with pressure. The relation between the pressure effect and the oxygen isotope effect on the magnetic penetration depth is also discussed. In order to analyze reliably the muSR spectra of samples with strong magnetic moments in a pressure cell, a special model was developed and applied.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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