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Open AccessArticle

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

Department of Physics, University of Texas at El Paso, 500 W. University Ave, El Paso, TX 79968, USA
Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, P. O. Box 524, Auckland Park 2006, South Africa
Institute of Physics, Sachivalaya Marg, Bhubaneswar 751005, India
Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400085, India
Department of Applied Physics, Birla Institute of Technology, Mesra 835215, Ranchi, Jharkhand, India
Max Planck Institute for Chemical Physics of Solids (MPICPfS), Nöthnitzerstraße 40, 01187 Dresden, Germany
Author to whom correspondence should be addressed.
Crystals 2019, 9(6), 322;
Received: 2 May 2019 / Revised: 7 June 2019 / Accepted: 10 June 2019 / Published: 25 June 2019
(This article belongs to the Special Issue Magnetic Field-induced Phase Transition)
The cubic intermetallic compound Sm 3Co 4Ge 13 (space group P m 3 ¯ n ) possesses a cage-like structure composed of Ge and displays an antiferromagnetic transition at T N 6 K in magnetization, M ( T ) , specific heat, C p ( T ) and in thermal conductivity, κ ( 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 γ = 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( 3 d)-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. View Full-Text
Keywords: quasi-skutterudites; samarium; field-insensitive quasi-skutterudites; samarium; field-insensitive
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Nair, H.S.; Kumar, K.R.; Sahu, B.; Xhakaza, S.P.; Mishra, P.; Samal, D.; Ghosh, S.K.; Sekhar, B.R.; Strydom, A.M. Field-Independent Features in the Magnetization and Specific Heat of Sm3Co4Ge13. Crystals 2019, 9, 322.

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