Spin-nematic order in the frustrated pyrochlore-lattice quantum rotor model

Details Spin-nematic order in the frustrated pyrochlore-lattice quantum rotor model Spin-nematic order in the frustrated pyrochlore-lattice quantum rotor model

2005-11-23

arxiv.org/abs/cond-mat/0511582v1

Phys. Rev. B 74, 024425 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 8 figures

Scientific paper

10.1103/PhysRevB.74.024425

As an example of ordering due to quantum fluctuations, we examine the nearest-neighbor antiferromagnetic quantum O(n) rotor model on the pyrochlore lattice. Classically, this system remains disordered even at zero temperature; we find that adding quantum fluctuations induces an ordered phase that survives to positive temperature, and we determine how its phase diagram scales with the coupling constant and the number of spin components. We demonstrate, using quantum Monte Carlo simulations, that this phase has long-range spin-nematic order, and that the phase transition into it appears to be first order.

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