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Evidence of a structural phase transition in superconducting SmFeAsO 1-xFx from 19F NMR
, K. Ghoshray, C. Mazumdar, A. Poddar, A. Ghoshray, D. Berardan, N. Dragoe
Published in
Volume: 25
Issue: 2
We report resistivity, magnetization and 19F NMR results in a polycrystalline sample of SmFeAsO0.86F0.14. The resistivity and magnetization data show a sharp drop at 48 K indicating a 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 undergoes a superconducting transition. This finding creates interest in exploring whether this is unique for Sm based systems or is also present in other rare-earth based 1111 superconductors. {\textcopyright} 2013 IOP Publishing Ltd.
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