期刊
PHYSICAL REVIEW LETTERS
卷 107, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.216403
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资金
- Materials Sciences and Engineering Division, Office of Basic Energy Sciences (BES), US DOE [DE-AC02-98CH10886]
- Scientific User Facilities Division, Office of BES, US DOE [DE-AC05-00OR22725]
Our inelastic neutron scattering study of spin excitations in iron telluride reveals remarkable thermal evolution of the collective magnetism. In the temperature range relevant for the superconductivity in FeTe1-xSex materials, where the local-moment behavior is dominated by liquidlike correlations of emergent spin plaquettes, we observe unusual, marked increase of magnetic fluctuations upon heating. The effective spin per Fe at T approximate to 10 K, in the phase with weak antiferromagnetic order, corresponds to S approximate to 1, consistent with the recent analyses that emphasize importance of Hund's coupling [K. Haule and G. Kotliar, New J. Phys. 11, 025021 (2009).]. However, it grows to S approximate to 3/2 in the high-T disordered phase, suggestive of the Kondo-type behavior, where local magnetic moments are entangled with the itinerant electrons.
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