Article

Unconventional temperature enhanced magnetism in Fe1.1Te.

CMPMSD, Brookhaven National Laboratory, Upton, New York 11973, USA.
Physical Review Letters (impact factor: 7.37). 11/2011; 107(21):216403. pp.216403
Source: PubMed

ABSTRACT 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 FeTe(1-x)Se(x) 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 ≈ 10  K, in the phase with weak antiferromagnetic order, corresponds to S ≈ 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 ≈ 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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Keywords

emphasize importance
 
Fe
 
Haule
 
high-T disordered phase
 
inelastic neutron scattering study
 
iron telluride
 
Kondo-type behavior
 
liquidlike correlations
 
local magnetic moments
 
local-moment behavior
 
New J. Phys
 
plaquettes
 
recent analyses
 
weak antiferromagnetic order