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物理学报. 1994, 43(10): 1704-1711.
doi: 10.7498/aps.43.1704.
Gd1-xCaxBa2Cu3O7-y高温超导体压力效应的研究
- 收稿日期: 1993-09-20
- 刊出日期: 1994-05-05
摘要: 研究了Ｇｄ1-xＣａxＢａ2Ｃｕ3Ｏ7-y（０．０≤Ｘ≤０．２０）高温超导体在常压和高压下的超导电性在１－３００Ｋ温度范围内，利用Ｂｒｉｄｇｍａｎ对顶砧获得压力达９．０ＧＰａ，测量了（Ｘ＝０．１０，０．１５，０．２０）样品的ｄＴc／ｄｐ分别为７．６８，７．８和４．４６Ｋ／ＧＰａ。发现Ｔc的压力导数随着ｃａ2+含量的增加而下降，分析了氧含量对Ｔc和ｄＴc／ｄＰ的影响．利用常压下晶格参数精修值和阳离子与氧离子间距随压力的改变，说明ＣｕＯ2面在超导电性上的作用，用ＣｕＯ2面之间耦合解释Ｔc（Ｐ）曲线的非线性关系。
English Abstract
HIGH-PRESSURE STUDIES OF THE Gd1-xCaxBa2Cu3O7-y HIGH-Tc SUPERCONDUCTORS
- Received Date:
20 September 1993
- Published Online:
05 May 1994
Abstract: We have investigated the superconductivity of Ca2+-dopped Gd1-xCaxBa2Cu3O7-y compounds under both ambient and high pressure. Using a Bridgman-anvil cell, the high pressure up to 9.0GPa, in temperature range of 1-300K, have been obtained. The superconducting transition temperature Tc (onset) initially increases with pressure at a rate of dTc/dP=7.68, 7.8 and 4.46K/GPa for x=0.10, 0.15, 0.20 samples at 0GPac has been investigated. By using the data of the structural parameters of samples at ambient pressure and the changes of the distances between cation and oxygen with the pressure, the role of the CuO2 plane on superconductivity is demonstrated. The coupling between the CuO2 planes may be used to explain the nonlinear dependence of Tc(P).
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