Specific-Heat Evidence for Quasi-1D Magnetic Order in CuO
J. W. LoramSchool of Mathematical and Physical Sciences, University of Sussex - Brighton BN1 9QH, UKK. A. H. MirzaSchool of Mathematical and Physical Sciences, University of Sussex - Brighton BN1 9QH, UKC. P JoyceSchool of Mathematical and Physical Sciences, University of Sussex - Brighton BN1 9QH, UKA. J OsborneSchool of Mathematical and Physical Sciences, University of Sussex - Brighton BN1 9QH, UK
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Abstract
High-precision specific-heat measurements of sintered CuO between 1.5 K and 340 K show a weak first-order anomaly at 212 K, a smaller than expected second-order anomaly at the Neel temperature TN = 230 K and substantial magnetic specific heat between TN and 340 K. We conclude that CuO is a quasi-one-dimensional system with Cu2+ chains more than 70% ordered at TN and with intra-chain coupling constant J/k = 460 K. Several moments of the phonon spectrum are determined and at liquid-helium temperatures γ = 0.26 mJ/mol K2 and ΘD = 396 K.
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