Asymmetric quintuplet condensation in the frustrated S=1 spin dimer compound Ba3Mn2O8

Details Asymmetric quintuplet condensation in the frustrated S=1 spin dimer compound Ba3Mn2O8 Asymmetric quintuplet condensation in the frustrated S=1 spin dimer compound Ba3Mn2O8

2009-05-04

arxiv.org/abs/0905.0467v2

Phys. Rev. Lett. 103, 047202 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.103.047202

Ba3Mn2O8 is a spin-dimer compound based on pairs of S = 1, 3d2, Mn5+ ions arranged on a triangular lattice. Antiferromagnetic intradimer exchange leads to a singlet ground state in zero-field, with excited triplet and quintuplet states at higher energy. High field thermodynamic measurements are used to establish the phase diagram, revealing a substantial asymmetry of the quintuplet condensate. This striking effect, all but absent for the triplet condensate, is due to a fundamental asymmetry in quantum fluctuations of the paramagnetic phases near the various critical fields.

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