Specific heat of YBa2Cu3O7: Origin of the "linear" term and volume fraction of superconductivity.
Specific heat of YBa2Cu3O7: Origin of the "linear" term and volume fraction of superconductivity.
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DOI：
10.1103/physrevlett.65.357
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发表时间：
1990-07
影响因子：
8.6
通讯作者：
Phillips;Fisher;Gordon;Kim;Stacy;Crawford;McCarron
中科院分区：
文献类型：
--
作者：
Phillips;Fisher;Gordon;Kim;Stacy;Crawford;McCarron
比热中线性‘’项的系数{Gamma}(0)，以及在{italT}{sub{italc}}，{Delta}{italC}处的不连续与测量的Cu{sup2+}磁矩浓度的关联表明，对破裂机制的运行限制了向超导态的转变，并产生了对{Gamma}(0)的贡献。没有证据表明存在对{Gamma}(0)的内在贡献。样品的{DELTA}{ITAL C}({ITAL T}{SUB{ITAL C}})的值提供了超导电性体积分数的量度，并为将参数的测量值修正为完全超导态的特征提供了基础。给出了与耦合强度有关的几个量的估计值。
Correlations of the coefficient of the linear'' term in the specific heat, {gamma}(0), and the discontinuity at {ital T}{sub {ital c}}, {Delta}{ital C}({ital T}{sub {ital c}}), with a measured concentration of Cu{sup 2+} magnetic moments suggest the operation of a pair-breaking mechanism that limits the transition to the superconducting state and produces a contribution to {gamma}(0). There is no evidence for the existence of an intrinsic contribution to {gamma}(0). The value of {Delta}{ital C}({ital T}{sub {ital c}}) for a sample provides a measure of the volume fraction of superconductivity and a basis for correcting measured values of parameters to those characteristic of the fully superconducting state. Estimates of several quantities relevant to the strength of coupling are given.