Pressure-induced effects on the structure of the FeSe superconductor
Pressure-induced effects on the structure of the FeSe superconductor
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DOI：
10.1016/j.ssc.2009.02.011
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发表时间：
2009-05-01
影响因子：
2.1
通讯作者：
Carpenter, Elisabeth
中科院分区：
文献类型：
--
作者：
Millican, Jasmine N.;Phelan, Daniel;Carpenter, Elisabeth
用固相反应法制备了室温下具有四重PbO型结构（P（4）/nmm）的FeSe多晶样品。我们已经研究了压力引起的结构变化，在不同的静水压力高达0.6 GPa的正交相（T = 50 K）和tetraxide（T = 190 K）相，使用高分辨率中子粉末衍射。我们报告说，该结构是相当可压缩的体积模量接近31 GPa至33 GPa和压力响应是各向异性的，具有较大的压缩性沿着c轴。SeFe（4）棱锥和FeSe（4）四面体的键角也被确定为压力的函数。爱思唯尔有限公司出版
A polycrystalline sample of FeSe, which adopts the tetragonal PbO-type structure (P(4)/nmm) at room temperature, has been prepared using solid state reaction. We have investigated pressure-induced structural changes in tetragonal FeSe at varying hydrostatic pressures up to 0.6 GPa in the orthorhombic (T = 50 K) and tetragonal (T = 190 K) phases using high resolution neutron powder diffraction. We report that the structure is quite compressible with a Bulk modulus approximate to 31 GPa to 33 GPa and that the pressure response is anisotropic with a larger compressibility along the c-axis. Key bond angles of the SeFe(4) pyramids and FeSe(4) tetrahedra are also determined as a function of pressure. Published by Elsevier Ltd