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  Field-insensitive heavy fermion features and phase transition in the caged-structure quasi-skutterudite Sm3 Ru4 Ge13

Nair, H. S., Kumar, R. K., Britz, D., Ghosh, S. K., Reinke, C., & Strydom, A. M. (2016). Field-insensitive heavy fermion features and phase transition in the caged-structure quasi-skutterudite Sm3 Ru4 Ge13. Journal of Alloys and Compounds, 669, 254-261. doi:10.1016/j.jallcom.2016.01.259.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-2F8E-B Version Permalink: http://hdl.handle.net/21.11116/0000-0001-092D-4
Genre: Journal Article

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 Creators:
Nair, Harikrishnan S.1, Author
Kumar, Ramesh K.1, Author
Britz, Douglas1, Author
Ghosh, Sarit K.1, Author
Reinke, Christian1, Author
Strydom, André M.2, Author              
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1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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 Abstract: The robust field-insensitive heavy fermion features in Sm-3 Ru-4 Ge-13 and the magnetic phase transition at T-N approximate to 5 K are studied using magnetization M(T), specific heat C-p(T), resistivity rho(T) and thermal conductivity k(T)(T). The average crystal structure of Sm-3 Ru-4 Ge-13 conforms to the cubic space group Pm (3) over barn however, signatures of subtle structural distortions are obtained from the x ray data. The magnetic susceptibility, chi(T), follows a modified CurieeWeiss law indicating the presence of crystal fields of Sm3+ and the significance of van Vleck terms. No sign of ferromagnetism is observed in M(H) of Sm-3 Ru-4 Ge-13 which yields only 0.025 mu(B)/f.u.-Sm at 2 K, 7 T. The Sommerfeld coefficient, gamma approximate to 220 mJ/mol-Sm K-2, estimated from the analysis of low temperature specific heat suggests the formation of heavy quasi particles at low temperature. Though a lnT dependence of rho(T) is observed till 60 K, the resistivity behavior is accounted for by assuming a two-band model for activated behavior of charge carriers. The field scans of resistivity, rho(H), below TN display significant nonlinearity while those above the TN are more metal-like. Low values of thermal conductivity, kappa(T)(T), are observed in Sm-3 Ru-4 Ge-13 however, displaying an anomaly at T-N which signifies magnetoelastic coupling. A fairly high value of Seebeck coefficient, S approximate to 40 mu V/K is observed at 300 K. We identify Sm-3 Ru-4 Ge-13 as a low charge carrier density system with unusual field-insensitive heavy fermion features very similar to the filled skutterudites. (C) 2016 Elsevier B.V. All rights reserved.

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Language(s): eng - English
 Dates: 2016-06-052016-06-05
 Publication Status: Published in print
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Title: Journal of Alloys and Compounds
  Abbreviation : J. Alloy. Comp.
Source Genre: Journal
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Publ. Info: Lausanne, Switzerland : Elsevier B.V.
Pages: - Volume / Issue: 669 Sequence Number: - Start / End Page: 254 - 261 Identifier: ISSN: 0925-8388
CoNE: /journals/resource/954925567746