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We report on measurements of the magnetic response of the anisotropic CuO_2spin chains in lightly hole-doped La_x (Ca,Sr)_14-x Cu_24 O_41, x>=5. Theexperimental data suggest that in magnetic fields B >~ 4T (applied along theeasy axis) the system is characterized by short-range spin order andquasi-static (quenched) charge disorder. The magnetic susceptibility chi(B)shows a broad anomaly, which we interpret as the remnant of a spin-floptransition. To corroborate this idea, we present Monte Carlo simulations of aclassical, anisotropic Heisenberg model with randomly distributed, staticholes. Our numerical results clearly show that the spin-flop transition of thepure model (without holes) is destroyed and smeared out due to the disorderintroduced by the quasi-static holes. Both the numerically calculatedsusceptibility curves chi(B) and the temperature dependence of the position ofthe anomaly are in qualitative agreement with the experimental data.Comment: 10 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.

physical review. b, condensed matter and materials physics

Quenched charge disorder in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>spin chains: Experimental and numerical studies

Quenched charge disorder inCuO2spin chains: Experimental and numerical studies