Evidence of structural phase transition in superconducting SmFeAsO(1-x)Fx from 19F NMR
Abstract
We report the resistivity, magnetization and 19F 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/T1) and spin-spin relaxation rate (1/T2) 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.
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