Degeneracy and Strong Fluctuation-Induced First-Order Phase Transition in the Dipolar Pyrochlore Antiferromagnet

Abstract

We show that a continuous set of degenerate critical soft modes strongly enhances the first-order character of a fluctuation-induced first-order transition in the pyrochlore dipolar Heisenberg antiferromagnet. Such a degeneracy seems essential to explain the strong first-order transition recently observed in Gd(2)Sn(2)O(7). We present some evidence from Monte-Carlo simulations and a perturbative renormalization group expansion.

arXiv comment8 pages, 9 figures, new version to appear in PRB, added refs

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Cited by in corpus (14)

• Magnetic Pyrochlore Oxides
• Magnetic ordering in Gd2Sn2O7: the archetypal Heisenberg pyrochlore antiferromagnet
• Order-by-Disorder in the XY Pyrochlore Antiferromagnet Revisited
• Example of a first-order Néel to Valence-Bond-Solid transition in two-dimensions
• Low temperature specific heat and possible gap to magnetic excitations in the Heisenberg pyrochlore antiferromagnet Gd2Sn207
• Long range order in the dipolar XY antiferromagnet Er${}_2$Sn${}_2$O${}_7$
• Palmer-Chalker correlations in the XY pyrochlore antiferromagnet Er2Sn2O7
• Fluctuation-Driven Selection at Criticality in a Frustrated Magnetic System: the Case of Multiple-k Partial Order on the Pyrochlore Lattice
• Spin-liquid dynamics of pyrochlore magnets Gd2Ti2O7 and Gd2Sn2O7
• Magnetic resonance in a pyrochlore antiferromagnet Gd2Ti2O7
• Spin Correlations in the Dipolar Pyrochlore Antiferromagnet Gd2Sn2O7
• Correlated valence-bond states
• Mapping the Phase Diagram of a Frustrated Magnet: Degeneracies, Flat Bands, and Canting Cycles on the Pyrochlore Lattice
• Ultrafast ferromagnetic fluctuations preceding magnetoelastic first-order transitions