la1.48nd0.4sr0.12cuo4结构相变和超导性的高压研究

IF 16.8 1区生物学 Nature Structural &Molecular Biology Pub Date : 2004-12-27 DOI:10.1103/PhysRevB.71.104513

M. Crawford, R. Harlow, S. Deemyad, V. Tissen, J. Schilling, E. Mccarron, S. Tozer, D. Cox, N. Ichikawa, S. Uchida, Q. Huang

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引用次数: 24

摘要

我们在金刚石砧胞中测定了La1.48Nd0.4Sr0.12CuO4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Tc = 3k迅速上升到5gpa时的最大值22k，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, Tc降低至~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。

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HIGH-PRESSURE STUDY OF STRUCTURAL PHASE TRANSITIONS AND SUPERCONDUCTIVITY IN LA1.48ND0.4SR0.12CUO4

We have determined the crystal structures and superconducting transition temperatures of La1.48Nd0.4Sr0.12CuO4 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 Tc = 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 Tc to ~12 K. These results are discussed in relation to earlier high pressure measurements for similar materials.

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来源期刊

Nature Structural &Molecular Biology 生物-生化与分子生物学

自引率

1.80%

发文量

160

期刊介绍： Nature Structural & Molecular Biology is a monthly journal that focuses on the functional and mechanistic understanding of how molecular components in a biological process work together. It serves as an integrated forum for structural and molecular studies. The journal places a strong emphasis on the functional and mechanistic understanding of how molecular components in a biological process work together. Some specific areas of interest include the structure and function of proteins, nucleic acids, and other macromolecules, DNA replication, repair and recombination, transcription, regulation of transcription and translation, protein folding, processing and degradation, signal transduction, and intracellular signaling.