Field-Independent Features in the Magnetization and Specific Heat of Sm3Co4Ge13

Nair, Harikrishnan S.; Kumar, K. Ramesh; Sahu, Baidyanath; Xhakaza, Sindisiwe P.; Mishra, Pramita; Samal, Debkanta; Ghosh, Sarit K.; Sekhar, Biju R.; Strydom, André M.

doi:10.3390/cryst9060322

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Field-Independent Features in the Magnetization and Specific Heat of Sm₃Co₄Ge₁₃

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Strydom, André M.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Nair, H. S., Kumar, K. R., Sahu, B., Xhakaza, S. P., Mishra, P., Samal, D., et al. (2019). Field-Independent Features in the Magnetization and Specific Heat of Sm₃Co₄Ge₁₃. Crystals, 9(6): 322, pp. 1-11. doi:10.3390/cryst9060322.

Cite as: https://hdl.handle.net/21.11116/0000-0004-7785-0

Abstract

The cubic intermetallic compound Sm3Co4Ge13 (space group Pm (3) over barn) possesses a cage-like structure composed of Ge and displays an antiferromagnetic transition at T-N approximate to 6 K in magnetization, M (T), specific heat, C-p (T) and in thermal conductivity, kappa(T). The magnetic transition at T-N is observed to be robust against applied magnetic fields up to 9 T. From the analysis of specific heat, a Sommerfeld coefficient gamma = 80(2) mJ/mol-Sm K-2 is estimated. The magnetic entropy released at T-N is estimated as lower than that of a doublet, R ln(2). A positive Seebeck coefficient is observed for the thermopower, S (T). Photoemission spectroscopy reveals distinct electronic character of the near-E-F valence band states arising out of Co(3d)-Sm(4 f) hybridization and Sm(4 f) electron correlation. The unusual field-independent features in magnetization, specific heat and electrical transport is an indication of the significant correlation between f and d wave functions.