THE ELECTRONIC SPECIFIC-HEAT OF OVER AND UNDERDOPED Y0.9CAO0.1BA2CU3O6+X

被引：14

作者：

LORAM, JW ^{[1
]}

MIRZA, KA ^{[1
]}

WADE, JM ^{[1
]}

TALLON, JL ^{[1
]}

机构：

[1] IND RES LTD, LOWER HUTT, NEW ZEALAND

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 1994年 / 235卷

关键词：

D O I：

10.1016/0921-4534(94)92089-3

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The electronic specific heat coefficient gamma(T) of Y0.9Ca0.1Ba2Cu3O6+x has been determined between 1.8K and 300K as a function of x. Ca substitution for Y increases the planar hole concentration, overdoping the fully oxygenated material and lowering x(opt) for optimum T-c to 0.78 for 10% Ca doping. A dramatic collapse of the specific heat jump for x<0.86 provides dear evidence for the opening of a normal state pseudogap in the underdoped material. From the shift to lower x by similar to 0.1 relative to corresponding values for YBa2Cu3O6+x we conclude that both x(opt) and the onset of a pseudogap are determined by the planar hole concentration and not decoupling of the planes or chain disorder due to oxygen vacancies.

引用

页码：1735 / 1736

页数：2

共 4 条

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LORAM, JW ;

MIRZA, KA ;

COOPER, JR ;

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PHYSICAL REVIEW LETTERS, 1993, 71 (11) :1740-1743

[4]

TALLON J, COMMUNICATION

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