Structural trends from a consistent set of single-crystal data of RFeAsO (R= La, Ce, Pr, Nd, Sm, Gd, and Tb)

Article

关键词: PHASE-DIAGRAM;    SUPERCONDUCTIVITY;    PRESSURE;    GROWTH;    METAL;   

DOI  :  10.1103/PhysRevB.82.134514

来源: SCIE

【 摘 要 】

A crystal-growth technique for single crystals of RFeAsO (R=La, Ce, Pr, Nd, Sm, Gd, and Tb) using NaI/KI as flux is presented. Crystals with a size up to 300 mu m were isolated for single-crystal x-ray diffraction measurements. Lattice parameters were determined by LeBail fits of x-ray powder data against LaB6 standard. A consistent set of structural data is obtained and interpreted in a hard-sphere model. Effective radii for the rare-earth metal atoms in RFeAsO are deduced. The relation of the intraplane and interplane distances of the arsenic atoms is identified as limiter of the phase formation, and its influence on T-c is discussed.

【 授权许可】

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