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We studied the melting of the charge order in the half-doped tetragonalperovskite La1.5Sr0.5CoO4 by elastic neutron scattering. We found that diffusepeaks, corresponding to the breathing-type modulation of oxygen positions inthe CoO6 octahedra, disappear above Tc = 825(27) K. This melting of the diffusesuperstructure is reversible (no change in the correlation lengths uponannealing is observed) and accompanied by a large nonlinear thermal expansionalong the tetragonal c-axis, with a cusp at Tc. We conclude that quencheddisorder of the doped Sr ions is at the origin of this anisotropic charge glassstate. We also suggest that its melting is driven by the transition from theintermediate- to the high-spin state of Co{3+} ion, which is favored by thespin entropy at high T.Comment: 4 pages, 4 figure

physical review. b, condensed matter

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Spin-entropy-driven melting of the charge order inLa1.5Sr0.5CoO