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Note on the thermodynamic Bethe ansatz approach to the quantum phase diagram of the strong coupling ladder compounds

Batchelor, Murray T.; Guan, Xi-Wen; Foerster, Angela; Zhou, H-Q.

Description

We investigate the low-temperature phase diagram of the exactly solved su(4) two-leg spin ladder as a function of the rung coupling J⊥ and magnetic field H by means of the thermodynamic Bethe ansatz (TBA). In the absence of a magnetic field the model exhibits three quantum phases, while in the presence of a strong magnetic field there is no singlet ground state for ferromagnetic rung coupling. For antiferromagnetic rung coupling, there is a gapped phase in the regime H < Hc1, a fully...[Show more]

dc.contributor.authorBatchelor, Murray T.
dc.contributor.authorGuan, Xi-Wen
dc.contributor.authorFoerster, Angela
dc.contributor.authorZhou, H-Q.
dc.date.accessioned2009-05-06T02:31:42Z
dc.date.accessioned2010-12-20T06:02:55Z
dc.date.available2009-05-06T02:31:42Z
dc.date.available2010-12-20T06:02:55Z
dc.identifier.citationNew Journal of Physics 5 (2003): 107.1-107.9
dc.identifier.issn1367-2630
dc.identifier.urihttp://hdl.handle.net/10440/219
dc.identifier.urihttp://digitalcollections.anu.edu.au/handle/10440/219
dc.description.abstractWe investigate the low-temperature phase diagram of the exactly solved su(4) two-leg spin ladder as a function of the rung coupling J⊥ and magnetic field H by means of the thermodynamic Bethe ansatz (TBA). In the absence of a magnetic field the model exhibits three quantum phases, while in the presence of a strong magnetic field there is no singlet ground state for ferromagnetic rung coupling. For antiferromagnetic rung coupling, there is a gapped phase in the regime H < Hc1, a fully polarized gapped phase for H > Hc2 and a Luttinger liquid magnetic phase in the regime Hc1 < H < Hc2. The critical behaviour derived using the TBA is consistent with the existing experimental, numerical and perturbative results for the strong coupling ladder compounds. This includes the spin excitation gap and the critical fields Hc1 and Hc2, which are in excellent agreement with the experimental values for the known strong coupling ladder compounds (5IAP)2CuBr4·2H2O, Cu2(C5H12N2)2Cl4 and (C5H12N)2CuBr4. In addition we predict the spin gap ∆ ≈ J⊥−1/2J║ for the weak coupling compounds with J⊥ ∼ J║ , such as (VO)2P2O7, and also show that the gap opens for arbitrary J⊥/J║ .
dc.format9 pages
dc.publisherInstitute of Physics Publishing
dc.sourceNew Journal of Physics
dc.source.urihttp://www.iop.org/EJ/article/1367-2630/5/1/107/njp3_1_107.pdf?request-id=409fa466-457c-4b65-bc96-7c726865b2aa
dc.source.urihttp://www.iop.org/EJ/article/1367-2630/5/1/107/njp3_1_107.html
dc.titleNote on the thermodynamic Bethe ansatz approach to the quantum phase diagram of the strong coupling ladder compounds
dc.typeJournal article
local.description.refereedYes
local.identifier.citationvolume5
dc.date.issued2003-08-11
local.identifier.absfor020404
local.identifier.ariespublicationMigratedxPub17318
local.type.statusPublished Version
local.contributor.affiliationBatchelor, Murray T, Research School of Physical Sciences and Engineering, Department of Theoretical Physics
local.contributor.affiliationGuan, Xi-Wen, Research School of Physical Sciences and Engineering, Department of Theoretical Physics
local.contributor.affiliationFoerster, Angela, Instituto de Fisica, Brazil
local.contributor.affiliationZhou, H-Q, University of Queensland
local.bibliographicCitation.startpage107.1
local.bibliographicCitation.lastpage107.9
dc.date.updated2015-12-12T08:30:01Z
local.identifier.scopusID2-s2.0-3042602862
CollectionsANU Research Publications

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