Frustration-induced valence bond crystal and its melting in Mo3Sb7

Details Frustration-induced valence bond crystal and its melting in Mo3Sb7 Frustration-induced valence bond crystal and its melting in Mo3Sb7

2008-05-26

arxiv.org/abs/0805.3892v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages. submitted

Scientific paper

10.1103/PhysRevLett.101.126404

121/123Sb nuclear quadrupole resonance and muon spin relaxation experiments of Mo3Sb7 revealed symmetry breakdown to a nonmagnetic state below the transition recently found at TS=50 K. The transition is characterized by a distinct lattice dynamics suggested from narrowing of nuclear fields. We point out that the Mo sublatice is a unique three-dimensional frustrated lattice where nearest-neighbor and next-nearest-neighbor antiferromagnetic interactions compete, and propose that tetragonal distortion to release the frustration stabilizes long-range order of spin-singlet dimers, i.e., valence bond crystal, which is thermally excited to the dynamic state with cubic symmetry.

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