Quenched charge disorder in CuO2 spin chains: Experimental and numerical studies

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dc.creatorLeidl, R.
dc.creatorKlingeler, R.
dc.creatorBuechner, B.
dc.creatorHoltschneider, M.
dc.creatorSelke, W.
dc.date2006-03-12
dc.date2006-05-13
dc.date.accessioned2026-07-07T07:02:22Z
dc.date.available2026-07-07T07:02:22Z
dc.descriptionWe report on measurements of the magnetic response of the anisotropic CuO_2 spin chains in lightly hole-doped La_x (Ca,Sr)_14-x Cu_24 O_41, x>=5. The experimental data suggest that in magnetic fields B >~ 4T (applied along the easy axis) the system is characterized by short-range spin order and quasi-static (quenched) charge disorder. The magnetic susceptibility chi(B) shows a broad anomaly, which we interpret as the remnant of a spin-flop transition. To corroborate this idea, we present Monte Carlo simulations of a classical, anisotropic Heisenberg model with randomly distributed, static holes. Our numerical results clearly show that the spin-flop transition of the pure model (without holes) is destroyed and smeared out due to the disorder introduced by the quasi-static holes. Both the numerically calculated susceptibility curves chi(B) and the temperature dependence of the position of the anomaly are in qualitative agreement with the experimental data.
dc.description10 pages, REVTeX4. 11 figures; v2: Fig.2 replaced, small changes in Figs.1 and 11; minor revisons in Sec. III.C; accepted by Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/0603325
dc.identifierhttp://arxiv.org/abs/cond-mat/0603325
dc.identifierPhys. Rev. B 73, 224415 (2006)
dc.identifierdoi:10.1103/PhysRevB.73.224415
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/108577
dc.subjectStrongly Correlated Electrons
dc.subjectStatistical Mechanics
dc.titleQuenched charge disorder in CuO2 spin chains: Experimental and numerical studies
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