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Magnetic excitations in La1.5Sr0.5CoO4

L. M. Helme, A. T. Boothroyd, D. Prabhakaran, F. R. Wondre, C. D. Frost, J. Kulda

cond-mat.str-elarXiv:cond-mat/0310778

Abstract

We report magnetization and neutron scattering measurements of the half-doped compound La1.5Sr0.5CoO4, which exhibits a checkerboard pattern of charge ordering below ~800K. In the antiferromagnetically-ordered phase below \~40K the spins are found to be canted in the ab plane. The spin excitation spectrum includes spin-wave excitations with a maximum energy of 16 meV, and diffuse magnetic modes at energies around 30 meV.

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