Coulombic Quantum Liquids in Spin-1/2 Pyrochlores

Details Coulombic Quantum Liquids in Spin-1/2 Pyrochlores Coulombic Quantum Liquids in Spin-1/2 Pyrochlores

2011-10-10

arxiv.org/abs/1110.2185v1

Phys. Rev. Lett. 108, 037202 (2012)

Physics

Condensed Matter

Strongly Correlated Electrons

4+ pages, 6+ pages of Supplementary Material, 4 figures, 1 table

Scientific paper

10.1103/PhysRevLett.108.037202

We develop a non-perturbative "gauge Mean Field Theory" (gMFT) method to study a general effective spin-1/2 model for magnetism in rare earth pyrochlores. gMFT is based on a novel exact slave-particle formulation, and matches both the perturbative regime near the classical spin ice limit and the semiclassical approximation far from it. We show that the full phase diagram contains two exotic phases: a quantum spin liquid and a coulombic ferromagnet, both of which support deconfined spinon excitations and emergent quantum electrodynamics. Phenomenological properties of these phases are discussed.

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