Pressure-Induced Modification of Crystal Structure in NdFeAsO_<1-y> (1-y=0.85), Accompanied by Remarkable Suppression of T_c(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

概要

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The atomic positions of the title oxypnictide compound under pressure were determined by Rietveld analysis of synchrotron X-ray diffraction data. Hydrostatic pressure has effects on the crystal structure in two points: (i) nearly isotropic compression of each of the Fe-As and Nd-O layers at the rate of 0.2%/GPa and (ii) outstanding shrinkage of the interlayer spacing (defined as the distance between adjacent As and Nd planes in this paper) at the rate of -0.7%/GPa. Remarkable suppression of T_c by hydrostatic pressure would originate from the change in the electronic structure caused by the modification of the crystal structure. The possible origins will be discussed.
社団法人日本物理学会の論文
2009-01-15