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Muon spin rotation investigation of the pressure effect on the magnetic penetration depth in YBa_2Cu_3O_x

机译:Muon自旋旋转研究YBa_2Cu_3O_x中压力对磁穿透深度的影响

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摘要

The pressure dependence of the magnetic penetration depth λ in polycrystalline samples of YBa_2Cu_3O_x with different oxygen concentrations x = 6.45, 6.6, 6.8, and 6.98 was studied by muon spin rotation (μSR). The pressure dependence of the superfluid density p_s ∝ I/λ~2 as a function of the superconducting transition temperature T_c is found to deviate from the usual Uemura line. The ratio (∂T_c/∂P)/(∂p_s/∂P) is smaller by a factor of approx=2 than that of the Uemura relation. In underdoped samples, the zero-temperature superconducting gap △_0 and the BCS ratio △_0/k_BT_c 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 λ is also discussed. In order to analyze reliably the μSR spectra of samples with strong magnetic moments in a pressure cell, a special model was developed and applied.
机译:通过μ自旋旋转(μSR)研究了不同氧浓度x = 6.45、6.6、6.8和6.98的YBa_2Cu_3O_x多晶样品中磁穿透深度λ的压力依赖性。发现超流体密度p_s∝ I /λ〜2的压力依赖性与超导转变温度T_c的关系与通常的上村线有所不同。比值(∂T_c/∂P)/(∂p_s/∂P)比Uemura关系小约2倍。在掺杂不足的样品中,零温度超导间隙△_0和BCS比△_0 / k_BT_c都随着外部静水压力的增加而增加,这意味着耦合强度随压力的增加而增加。还讨论了压力效应和氧同位素效应对λ的关系。为了可靠地分析压力盒中具有强磁矩的样品的μSR光谱,开发并应用了一种特殊模型。

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  • 来源
    《Physical review》 |2011年第18期|p.184523.1-184523.10|共10页
  • 作者单位

    Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland,Physik-Institut der Universitat Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland;

    Department of Physics, Tbilisi State University, Chavchavadze av. 3, GE-0128 Tbilisi, Georgia;

    Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland;

    Laboratory for Developments and Methods, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland;

    Physik-Institut der Universitat Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    cuprate superconductors (high-Tc and insulating parent compounds); pressure effects;

    机译:铜酸盐超导体(高Tc和绝缘母体化合物);压力效应;

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