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首页> 外文期刊>Solid State Communications >A low temperature internal friction study of Y_(0.85)Ca_(0.15)Ba_2Cu_3 O_(7-δ) with different oxygen content
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A low temperature internal friction study of Y_(0.85)Ca_(0.15)Ba_2Cu_3 O_(7-δ) with different oxygen content

机译：不同氧含量的Y_（0.85）Ca_（0.15）Ba_2Cu_3 O_（7-δ）的低温内摩擦研究

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摘要

The ceramic sample of Y_(0.85)Ca_(0.15)Ba_2Cu_3 O_(7-δ) was prepared by standard solid-state reaction method, and samples with different oxygen concentration were obtained by quenching from high temperature. The internal friction was measured using the vibrating reed method from liquid-nitrogen temperature to room temperature at kilohertz frequency. An internal friction peak was observed around 250 K in Y_(0.85)Ca_(0.15)Ba_2Cu_3 O_(7-δ) quenched from 1023 K. The peak is related to the one observed around 220 K (labeled as P3 peak) in undoped YBa_2Cu_3O_(7-δ) (Y123). This result shows the dependence of P3 peak on carriers density and P3 peak has a strong correlation to the abnormal behavior of Y123 in the underdoped range. The variation of two low temperature thermal activated relaxation peaks (P1 and P2) on oxygen content were also investigated. And consistent explanations were given based on all recent researches.
机译：采用标准固相反应法制备了Y_（0.85）Ca_（0.15）Ba_2Cu_3 O_（7-δ）陶瓷样品，并通过高温淬火得到了不同氧浓度的样品。使用振动簧片法从液氮温度到室温以千赫兹频率测量内部摩擦。从1023 K开始淬火的Y_（0.85）Ca_（0.15）Ba_2Cu_3 O_（7-δ）中观察到250 K附近的内部摩擦峰。该峰与未掺杂的YBa_2Cu_3O_中在220 K附近观察到的一个内部摩擦峰（标记为P3峰）有关。 （7-δ）（Y123）。该结果表明P3峰对载流子密度的依赖性，并且P3峰与Y123在掺杂不足范围内的异常行为有很强的相关性。还研究了两个低温热活化弛豫峰（P1和P2）随氧含量的变化。并根据所有最新研究给出了一致的解释。

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