Tetragonal-to-Orthorhombic Structural Phase Transition at 90 K in the Superconductor Fe1.01Se
Tetragonal-to-Orthorhombic Structural Phase Transition at 90 K in the Superconductor Fe1.01Se
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DOI：
10.1103/physrevlett.103.057002
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发表时间：
2009-07-31
影响因子：
8.6
通讯作者：
Cava, R. J.
中科院分区：
文献类型：
--
作者：
McQueen, T. M.;Williams, A. J.;Cava, R. J.
在这封信中，我们表明，超导Fe 1.01 Se经历了一个结构转变，在90 K从四方晶系的正交相，但非超导Fe 1.03 Se没有。在低温下的高分辨率电子显微镜进一步揭示了一个意想不到的额外调制的超导相的晶体结构，涉及的Fe原子的位移，和非超导组合物显示出不同的，复杂的纳米尺度的结构调制。最后，我们表明，磁性是不是在超导相的相变的驱动力。
In this Letter we show that superconducting Fe1.01Se undergoes a structural transition at 90 K from a tetragonal to an orthorhombic phase but that nonsuperconducting Fe1.03Se does not. High resolution electron microscopy at low temperatures further reveals an unexpected additional modulation of the crystal structure of the superconducting phase that involves displacements of the Fe atoms, and that the nonsuperconducting composition shows a different, complex nanometer-scale structural modulation. Finally, we show that magnetism is not the driving force for the phase transition in the superconducting phase.