Partial order from disorder in a classical pyrochlore antiferromagnet

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dc.contributor.author Chern, G.-W.
dc.contributor.author Moessner, R.
dc.contributor.author Tchernyshyov, O.
dc.date.accessioned 2009-12-29T18:17:25Z
dc.date.available 2009-12-29T18:17:25Z
dc.date.issued 2008-10-01
dc.identifier.citation Physical Review B (Condensed Matter and Materials Physics) 1 Oct. 2008, vol.78, no.14, 144418 (14 pp.) en
dc.identifier.uri http://jhir.library.jhu.edu/handle/1774.2/33730
dc.description.abstract We investigate theoretically the phase diagram of a classical Heisenberg antiferromagnet on the pyrochlore lattice perturbed by a weak second-neighbor interaction J2. The huge ground-state degeneracy of the nearest-neighbor Heisenberg spins is lifted by J2 and a magnetically ordered ground state sets in upon approaching zero temperature. We have found a new, partially ordered phase with collinear spins at finite temperatures for a ferromagnetic J2. In addition to a large nematic order parameter, this intermediate phase also exhibits a layered structure and a bond order that breaks the sublattice symmetry. Thermodynamic phase boundaries separating it from the fully disordered and magnetically ordered states scale as 1.87J2S2 and 0.26J2S2 in the limit of small J2. The phase transitions are discontinuous. We analytically examine the local stability of the collinear state and obtain a boundary T~J22/J1 in agreement with Monte Carlo simulations. en
dc.description.provenance Submitted by Susan Vazakas (svazakas@jhu.edu) on 2009-12-29T15:31:30Z No. of bitstreams: 1 Oleg Partial 2008.pdf: 1045538 bytes, checksum: 77a54d556ac02c003b5fb2898a1e77d8 (MD5) en
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dc.description.provenance Made available in DSpace on 2009-12-29T18:17:25Z (GMT). No. of bitstreams: 1 Oleg Partial 2008.pdf: 1045538 bytes, checksum: 77a54d556ac02c003b5fb2898a1e77d8 (MD5) Previous issue date: 2008-10-01 en
dc.language.iso en_US en
dc.publisher American Physical Society en
dc.subject order-disorder transformations en
dc.subject magnetic transitions en
dc.subject antiferromagnetic materials en
dc.subject classical Heisenberg antiferromagnet en
dc.subject pyrochlore lattic en
dc.subject ground state degeneracy en
dc.subject nearest-neighbor Heisenberg spins en
dc.subject magnetically ordered ground state en
dc.subject ferromagnetism en
dc.subject nematic order parameter en
dc.subject thermodynamic phase boundarie en
dc.subject Monte Carlo simulations en
dc.title Partial order from disorder in a classical pyrochlore antiferromagnet en
dc.type Article en

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