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首页> 外文期刊>Physica, C. Superconductivity and its applications >Structural relaxation, metal-to-insulator transition and pseudo-gap in oxygen deficient HoBa2Cu3O7-delta single crystals
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Structural relaxation, metal-to-insulator transition and pseudo-gap in oxygen deficient HoBa2Cu3O7-delta single crystals

机译:缺氧的HoBa2Cu3O7-delta单晶的结构弛豫,金属到绝缘体的跃迁和拟间隙

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The effect of annealing at room temperatures on the conductivity in the basis plane of oxygen deficient HoBa2Cu3O7-delta single crystals, tempered from a temperature of 650 degrees C is investigated. We determine that during the annealing process an extension of the area of the linear dependence of the resistivity rho(ab)(T) occurs. A shift downwards of the temperature interval corresponding to the metal-to-insulator transition and a considerable transformation of the form of the resistivity transfers to the superconducting state was observed. The absolute value of the temperature that the pseudo-gap regime commences is reduced by about 20 K. The results are attributed to labile oxygen ordering without changing the concentration of oxygen in the sample. The estimation of the cluster sizes is characterized by the differences in oxygen content. We perform a comparative analysis between the experimental data with the predictions of the high temperature superconductivity cluster theory.
机译:研究了室温退火对从650摄氏度温度回火的缺氧HoBa2Cu3O7-δ单晶的基面电导率的影响。我们确定,在退火过程中,电阻率rho(ab)(T)与线性关系的面积发生了扩展。观察到温度间隔向下移动,这对应于金属到绝缘体的转变,并且电阻率形式的相当大的转变转变为超导状态。准能隙开始的温度的绝对值降低了约20K。结果归因于不稳定的氧排序,而没有改变样品中的氧浓度。团簇尺寸的估计的特征在于氧含量的差异。我们将实验数据与高温超导簇理论的预测结果进行比较分析。

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