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6 papers · 1 filter
Bose-Einstein Condensation in Magnetic Insulators
T. Giamarchi, Ch. Rüegg, O. Tchernyshyov
The elementary excitations in antiferromagnets are magnons, quasiparticles with integer spin and Bose statistics. In an experiment their density is controlled efficiently by an app…
Flux expulsion and greedy bosons: frustrated magnets at large N
O. Tchernyshyov, R. Moessner, S. L. Sondhi
We investigate the Sp(N) mean-field theory for frustrated quantum magnets. First, we establish some general properties of its solutions; in particular, for small spin we propose si…
Structural, orbital, and magnetic order in vanadium spinels
O. Tchernyshyov
Vanadium spinels (ZnV_2O_4, MgV_2O_4, and CdV_2O_4) exhibit a sequence of structural and magnetic phase transitions, reflecting the interplay of lattice, orbital, and spin degrees…
Valence-bond crystal in a {111} slice of the pyrochlore antiferromagnet
Oleg Tchernyshyov, Hong Yao, R. Moessner
We investigate theoretically the ordering effect of quantum spin fluctuations in a Heisenberg antiferromagnet on a two-dimensional network of corner sharing tetrahedra. This networ…
Quantum spin liquids: a large-S route
Oleg Tchernyshyov
This paper explores the large-S route to quantum disorder in the Heisenberg antiferromagnet on the pyrochlore lattice and its homologues in lower dimensions. It is shown that zero-…
Bond order from disorder in the planar pyrochlore magnet
O. Tchernyshyov, O. A. Starykh, R. Moessner +1
We study magnetic order in the Heisenberg antiferromagnet on the checkerboard lattice, a two-dimensional version of the pyrochlore network with strong geometric frustration. By emp…