High-pressure study of structural phase transitions and superconductivity in La1.48Nd0.4Sr0.12CuO4 -: art. no. 104513
High-pressure study of structural phase transitions and superconductivity in La1.48Nd0.4Sr0.12CuO4 -: art. no. 104513
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DOI：
10.1103/physrevb.71.104513
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发表时间：
2005-03-01
影响因子：
3.7
通讯作者：
Huang, Q
中科院分区：
文献类型：
--
作者：
Crawford, MK;Harlow, RL;Huang, Q
我们测定了金刚石砧细胞中La(1.48)Nd(0.4)Sr(0.12)CuO(4)在接近静水压力下的晶体结构和超导转变温度，分别为5.0 GPa和19.0 GPa。采用同步加速器x射线粉末衍射测量，建立了压力-温度结构相图。在压力下，超导转变温度从T(c)大约3 K迅速上升到5 GPa时的最大值22 K，这个压力略大于在超导状态下稳定未变形的I4/mmm结构所需的压力。进一步增加压力至19 GPa，导致T(c)下降至12 K。这些结果与以前对类似材料的高压测量结果进行了讨论。
We have determined the crystal structures and superconducting transition temperatures of La(1.48)Nd(0.4)Sr(0.12)CuO(4) under nearly hydrostatic pressures in diamond anvil cells to 5.0 GPa and 19.0 GPa, respectively. Synchrotron x-ray powder diffraction measurements were used to establish the pressure-temperature structural phase diagram. Under pressure the superconducting transition temperature increases rapidly from T(c)approximate to 3 K to a maximum value of 22 K at 5 GPa, a pressure slightly greater than that required to stabilize the undistorted I4/mmm structure in the superconducting state. Increasing the pressure further to 19 GPa leads to a decrease in T(c) to similar to 12 K. These results are discussed in relation to earlier high pressure measurements for similar materials.