Abstract
An optical spectroscopic study of quasi-Haldane chain nickelate Sm\(_{2}\)BaNiO\(_{5}\) is presented. A temperature-dependent splitting of the ground-state Kramers doublet of the Sm\(^{3+}\) ion due to an antiferromagnetic ordering at \(T_{N}\) = 55 K has been obtained experimentally and used to calculate the Schottky-type anomaly in magnetic susceptibility. The value of the magnetic moment of Sm\(^{3+}\) ion at zero temperature has been estimated within the model of the ground doublet. One-dimensional magnetic behavior of the nickel subsystem is emphasized.
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Acknowledgments
Authors have a pleasure to thank B.V. Mill for the sample synthesis and M.N. Popova for helpful discussions. Financial support of the Russian Academy of Sciences under the Program for Basic Research “Problems of low-temperature physics” is acknowledged.
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Galkin, A.S., Klimin, S.A. Exploring the Magnetic Susceptibility of a Haldane Compound Sm\(_{2}\)BaNiO\(_{5}\): Optical Spectroscopy of Sm\(^{3+}\) Kramers Doublets. J Low Temp Phys 185, 531–537 (2016). https://doi.org/10.1007/s10909-016-1645-2
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DOI: https://doi.org/10.1007/s10909-016-1645-2