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Evidence of structural phase transition in superconducting SmFeAsO_(1-x)F_x from 19^F NMR

We report the resistivity, magnetization and 19^F NMR results in polycrystalline sample of SmFeAsO_(0.86)F_(0.14). The resistivity and the magnetization data show a sharp drop at 48 K indicating the superconducting transition. The nuclear spin-lattice rate (1/T_1) and spin-spin relaxation rate (1/T_2) clearly show the existence of a structural phase transition near 163 K in the sample which also undergo superconducting transition. This finding creates interest to explore whether this is unique for only Sm based systems or it is also present in other rare-earth based 1111 superconductors.

preprint2012arXivOpen access
M. MajumderK. GhoshrayC. MazumdarA. PoddarA. GhoshrayD. BerardanN. Dragoe
cond-mat.supr-concond-mat.str-el
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M. MajumderK. GhoshrayC. MazumdarA. PoddarA. GhoshrayD. BerardanN. Dragoe

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