Journal
PHYSICAL REVIEW B
Volume 78, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.212509
Keywords
arsenic alloys; barium alloys; iron alloys; magnetic transitions; nuclear magnetic resonance; nuclear spin-lattice relaxation; spin density waves; spin fluctuations; superconducting transition temperature
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We report an As-75 NMR study of BaFe2As2 in both single crystals and polycrystal forms. We find that Sn impurities in the single crystal dramatically alter the low energy spin fluctuations and suppress the ordering temperature from 138 to 85 K. In contrast to Sn-free samples, we find that the temperature dependence of the As-75 NMR spectra and spin-lattice relaxation rates reveal a second-order phase transition to a state of incommensurate magnetic order.
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