Hidden spin liquid in an antiferromagnet: Applications to FeCrAs

Details Hidden spin liquid in an antiferromagnet: Applications to FeCrAs Hidden spin liquid in an antiferromagnet: Applications to FeCrAs

2011-07-05

arxiv.org/abs/1107.1002v1

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 8 figures

Scientific paper

10.1103/PhysRevB.84.104448

The recently studied material FeCrAs exhibits a surprising combination of experimental signatures, with metallic, Fermi liquid like specific heat but resistivity showing strong non-metallic character. The Cr sublattice posseses local magnetic moments, in the form of stacked (distorted) Kagome lattices. Despite the high degree of magnetic frustration, anti-ferromagnetic order develops below ~125K suggesting the non-magnetic Fe sublattice may play a role in stabilizing the ordering. From the material properties we propose a microscopic Hamiltonian for the low energy degrees of freedom, including the non-magnetic Fe sublattice, and study its properties using slave-rotor mean field theory. Using this approach we find a spin liquid phase on the Fe sublattice, which survives even in the presence of the magnetic Cr sublattice. Finally, we suggest that the features of FeCrAs can be qualitatively explained by critical fluctuations in the non-magnetic sublattice Fe due to proximity to a metal-insulator transition.

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