Superconducting and normal state energy gaps in Y0.8Ca0.2Ba2Cu3O7-delta from the electronic specific heat.

被引：93

作者：

Loram, JW ^{[1
]}

Mirza, KA ^{[1
]}

Cooper, JR ^{[1
]}

Tallon, JL ^{[1
]}

机构：

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

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 1997年 / 282卷

关键词：

D O I：

10.1016/S0921-4534(97)00799-5

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

From the electronic specific heat of Y0.8Ca0.2Ba2Cu3O7-delta we determine the delta-dependences of the condensation energy U(0) and the superconducting and normal state energy gaps Delta(0) and Gamma. The data supports d-symmetry for both gaps. Although Delta(0) increases with delta across the entire series, a rapid increase in Gamma similar to 940(delta-0.2) (K) results in a peak in U(0) at delta similar to 0.25 and the suppression of U(0) and T-c in underdoped samples. We conclude that the normal state gap results from competing singlet correlations and not precursor superconducting pairing.

引用

页码：1405 / 1406

页数：2

共 3 条

[1] ELECTRONIC SPECIFIC-HEAT OF YBA2CU3O6+X FROM 1.8 TO 300-K [J].

LORAM, JW ;

MIRZA, KA ;

COOPER, JR ;

LIANG, WY ;

WADE, JM .

JOURNAL OF SUPERCONDUCTIVITY, 1994, 7 (01) :243-249

[2] THE ELECTRONIC SPECIFIC-HEAT OF CUPRATE SUPERCONDUCTORS [J].

LORAM, JW ;

MIRZA, KA ;

WADE, JM ;

COOPER, JR ;

LIANG, WY .

PHYSICA C, 1994, 235 :134-137

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

LORAM, JW ;

MIRZA, KA ;

WADE, JM ;

TALLON, JL .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 1994, 235 :1735-1736

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