Superconductivity in the tetragonal lattice of underdoped La2−χSrχCuO4
Superconductivity in the tetragonal lattice of underdoped La2−χSrχCuO4
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欠掺杂 La2−χSrχCuO4 四方晶格中的超导性
DOI：
10.1016/s0921-4534(00)01411-8
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发表时间：
2000
影响因子：
1.7
通讯作者：
S. Iwata
中科院分区：
文献类型：
--
作者：
T. Fujita;J. Hori;T. Goko;N. Kikugawa;S. Iwata
研究了各向异性压力下la2−χ Sr χ cuo4在四方相和正交相中的超导转变。正交畸变严重地降低了超导转变温度，特别是在欠掺杂区域。通过外推压力诱导四方相中的温度，我们成功地得到了环境压力下四方晶格的温度-χ相图，这表明温度的变化是由于一阶超导体-绝缘体在χ= 0.05左右的转变而不连续的。
The superconducting transition in La 2− χ Sr χ CuO 4 under anisotropic pressure was investigated in the tetragonal phase as well as in the orthorhombic phase. Orthorhombic distortion was found to heavily depress the superconducting transition temperature T c especially in the underdoped region. By extrapolation of T c in the pressure-induced tetragonal phase, we successfully obtained a T c-χ phase diagram for the tetragonal lattice at ambient pressure, which suggests a discontinuous change in T c due to the first order superconductor-insulator transition around χ= 0.05.