Frustrated ferromagnetic spin-1/2 chain in a magnetic field: The phase diagram and thermodynamic properties

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dc.creatorHeidrich-Meisner, F.
dc.creatorHonecker, A.
dc.creatorVekua, T.
dc.date2006-05-08
dc.date2006-09-05
dc.date.accessioned2026-07-07T07:08:50Z
dc.date.available2026-07-07T07:08:50Z
dc.descriptionThe frustrated ferromagnetic spin-1/2 Heisenberg chain is studied by means of a low-energy field theory as well as the density-matrix renormalization group and exact diagonalization methods. Firstly, we study the ground-state phase diagram in a magnetic field and find an `even-odd' (EO) phase characterized by bound pairs of magnons in the region of two weakly coupled antiferromagnetic chains. A jump in the magnetization curves signals a first-order transition at the boundary of the EO phase, but otherwise the curves are smooth. Secondly, we discuss thermodynamic properties at zero field, where we confirm a double-peak structure in the specific heat for moderate frustrating next-nearest neighbor interactions.
dc.description4 pages RevTex4, 4 figures. Minor changes, title modified. Additional material is available here: http://www.theorie.physik.uni-goettingen.de/~honecker/j1j2-td/
dc.identifierhttps://arxiv.org/abs/cond-mat/0605204
dc.identifierhttp://arxiv.org/abs/cond-mat/0605204
dc.identifierPhys. Rev. B 74, 020403(R) (2006)
dc.identifierdoi:10.1103/PhysRevB.74.020403
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/110852
dc.subjectStrongly Correlated Electrons
dc.titleFrustrated ferromagnetic spin-1/2 chain in a magnetic field: The phase diagram and thermodynamic properties
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