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Effect of oxygen deficiency on the magnetic field-dependent entropy in YBa2 Cu3 O7a?’e???

机译:缺氧对YBa2 Cu3 O7a?e ???磁场依赖熵的影响

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Roulin $mathit{et}$ $mathit{al}$ (1988), in one of their experimental papers, have presented a study of field-dependent entropy of high-purity YBa2 Cu3 O7a?’e??? (YBCO) as a function of oxygen deficiency. In order to explain their experimental results, we have used phenomenological GL-theory of anisotropic HTSCs in the London limit in line with of our earlier paper (Pattanaik $mathit{et}$ $mathit{al}$, Physica B405, 3234 (2010)). Moreover, to account for the applicability of the theory at high field, we have incorporated the effect of vortex overlapping in the London theory done by Nanda (1995). Here, we have presented the variation of change in entropy (e??¥S) with magnetic field for different oxygen deficiencies e??? = 0, 0.04, and 0.06. On comparison, we found that our results are in good agreement with the experimental data of Roulin $mathit{et}$ $mathit{al}$ (1988). The variation of penetration depth (e???) and anisotropic ratio of effective masses (e???) with concentration is also presented.
机译:Roulin $ mathit {et} $ $ mathit {al} $(1988)在他们的一项实验论文中提出了对高纯度YBa2 Cu3 O7a的场依熵的研究。 (YBCO)作为缺氧的函数。为了解释他们的实验结果,我们在伦敦范围内采用了各向异性HTSC的现象学GL理论,以符合我们之前的论文(Pattanaik $ mathit {et} $ $ mathit {al} $,Physica B405,3234(2010 ))。此外,为了说明该理论在高场的适用性,我们将涡旋重叠的影响纳入了Nanda(1995)所做的伦敦理论中。在这里,我们给出了不同氧缺乏量e的熵(e ?? ¥ S)随磁场的变化。 = 0、0.04和0.06。相比之下,我们发现我们的结果与Roulin $ mathit {et} $ $ mathit {al} $(1988)的实验数据非常吻合。还给出了渗透深度(e△)和有效质量的各向异性比(e△)随浓度的变化。

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