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

1
Department of Physics, University of Texas at El Paso, 500 W. University Ave, El Paso, TX 79968, USA
2
Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, P. O. Box 524, Auckland Park 2006, South Africa
3
Institute of Physics, Sachivalaya Marg, Bhubaneswar 751005, India
4
Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400085, India
5
Department of Applied Physics, Birla Institute of Technology, Mesra 835215, Ranchi, Jharkhand, India
6
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; https://doi.org/10.3390/cryst9060322
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)
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Abstract

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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