Strong dependence of the linear-temperature term of heat capacity on Ba- and Sr-doping in the La2CuO4 system
Strong dependence of the linear-temperature term of heat capacity on Ba- and Sr-doping in the La2CuO4 system
复制标题
La2CuO4 系统中热容量的线性温度项对 Ba 和 Sr 掺杂的强烈依赖性
DOI：
10.1016/0304-8853(88)90499-4
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发表时间：
1988
影响因子：
2.7
通讯作者：
H. Nakajima
中科院分区：
文献类型：
--
作者：
K. Kumagai;Y. Nakamura;I. Watanabe;Y. Nakamichi;H. Nakajima
La2−xMxCuO4(M = Ba, Sr) 中热容的线性温度项 γT 在反铁磁有序状态下不存在。 x> 0.02 的有限 γ 是固有的，并且归因于自旋自由度。在超导（SC）区域x>0.06，γ表现出很强的x依赖性。 Ba 掺杂时 γ 非常小，x= 0.10，Sr 掺杂时 0.10 <χ< 0.20。在 Ba 掺杂系统中，SC 转变温度随成分发生了意想不到的剧烈变化。
The linear-temperature term,γT, of heat capacity in La2−xMxCuO4(M = Ba, Sr) is absent in the antiferromagnetically ordered state. The finite γ forx> 0.02 is intrinsic and is attributed to the spin degrees of freedom. In the superconducting (SC) regionx> 0.06, γ shows a strongx-dependence. γ is vanishingly small atx= 0.10 for Ba-doping and 0.10 <χ< 0.20 for Sr-doping. An unexpected violent change of the SC transition temperatures with composition is obtained in the Ba-doped system.