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We report the resistivity, magnetization and 19^F NMR results inpolycrystalline sample of SmFeAsO_(0.86)F_(0.14). The resistivity and themagnetization data show a sharp drop at 48 K indicating the superconductingtransition. 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 Kin the sample which also undergo superconducting transition. This findingcreates interest to explore whether this is unique for only Sm based systems orit is also present in other rare-earth based 1111 superconductors.

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