The route of frustrated cuprates from antiferromagnetic to ferromagnetic spin-1/2 Heisenberg chains: Li2ZrCuO4 as a missing link near the quantum critical point

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dc.creatorDrechsler, S. -L.
dc.creatorVolkova, O.
dc.creatorVasiliev, A. N.
dc.creatorTristan, N.
dc.creatorRichter, J.
dc.creatorSchmitt, M.
dc.creatorRosner, H.
dc.creatorMalek, J.
dc.creatorKlingeler, R.
dc.creatorZvyagin, A. A.
dc.creatorBuechner, B.
dc.date2007-01-30
dc.date2007-02-01
dc.date.accessioned2026-07-07T07:46:30Z
dc.date.available2026-07-07T07:46:30Z
dc.descriptionFrom thermodynamics, LSDA+U calculations and exact diagonalization studies of a five-band Hubbard (Cu 3d, O 2p) model on CuO2 stripes we found that Li2ZrCuO4 (Li2CuZrO4 in traditional notation) is close to a ferromagnetic critical point. Analyzing its measured susceptibility chi(T) and specific heat cp(T,H) within a Heisenberg model, we show that the ratio of the 2nd to the 1st neighbor exchange integrals alpha=-J2/J1 of the order of 0.3, i.e. it is close to the critical value alpha_c=1/4. Comparing with related chain cuprates we explain the rather strong field dependence of cp, the monotonous down shift of the peak of chi(T), and its increase for alpha approaching 1/4 + 0.
dc.description4 pages, 5 figures, unshortened version of an article in press in Phys. Rev. Lett. v. 98, February 12 (2007). High-qualitity versions of Figs, 1,2,4 are available upon request
dc.identifierhttps://arxiv.org/abs/cond-mat/0701741
dc.identifierhttp://arxiv.org/abs/cond-mat/0701741
dc.identifierPhys. Rev. Lett. v. 98, 077202 (2007).
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/123851
dc.subjectStrongly Correlated Electrons
dc.titleThe route of frustrated cuprates from antiferromagnetic to ferromagnetic spin-1/2 Heisenberg chains: Li2ZrCuO4 as a missing link near the quantum critical point
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