Low-temperature specific heat of overdoped Bi2201 single crystals

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• 作者：Ikuta ; Hiroshi ; Matsuura ; Masaaki ; Biwa ; Tetsushi
• 关键词：Specific heat ; d-wave symmetry ; Pair-breaking ; Impurity effect
• 刊名：Physica C
• 出版年：2003
• 期刊代码：80_09214534
• 类别：ms
• 出版时间：May, 2003
• 卷：388-389
• 期：Complete
• 页码：361-362
• 文件大小：79.2 K

摘要

Low-temperature specific heat of heavily overdoped Bi₂Sr₂CuO₆ single crystals was studied. The specific heat under zero magnetic field included a linear-T term, suggesting the presence of a large pair-breaking effect, which we attribute to impurities because their influence on d-wave superconductors increases when the energy gap decreases with carrier overdoping. The field dependence of the electronic specific heat followed well the prediction for an impure d-wave superconductor.