Specific-heat anomaly of overdoped Bi1.8Pb0.3Sr1.9CuOy

被引：5

作者：

Mayama, H ^{[1
]}

Okajima, Y ^{[1
]}

Yamaya, K ^{[1
]}

机构：

[1] Hokkaido Univ, Dept Appl Phys, Sapporo, Hokkaido 060, Japan

来源：

PHYSICAL REVIEW B | 1998年 / 57卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.57.14470

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The temperature dependence of the specific heat of Bi1.8Pb0.3SR1.9CuOy samples in the overdoped region has been measured between 1.5 and 8 K. Specific-heat anomalies were observed at T-c in two superconducting samples, while no anomalies were observed in a nonsuperconducting one. The values of Delta C/gamma T-c were quite small in comparison to the BCS value, and the electronic specific heat in the superconducting state near T-c exhibited a weak temperature dependence. These findings are consistent with the impurity effects predicted by the model of d-wave superconductors proposed by Sun and Maki. Furthermore, we found that the Sommerfeld constant y increases with increasing doped carrier from the superconducting region to the normal metal region,in contrast to the case of La2-xSrxCuO4.

引用

页码：14470 / 14475

页数：6

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