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Double-phase transition and giant positive magnetoresistance in the quasi-skutterudite Gd3Ir4Sn13

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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., Ghosh, S. K., Kumar, R. K., & Strydom, A. M. (2016). Double-phase transition and giant positive magnetoresistance in the quasi-skutterudite Gd3Ir4Sn13. Journal of Applied Physics, 119(12): 123901, pp. 1-6. doi:10.1063/1.4944596.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002A-5331-E
Abstract
The magnetic, thermodynamic, and electrical/thermal transport properties of the caged-structure quasi-skutterudite Gd3Ir4Sn13 are re-investigated. The magnetization M(T), the specific heat C-p(T), and the resistivity rho(T) reveal a double-phase transition-at T-N1 similar to 10K and at T-N2 similar to 8.8 K-which was not observed in the previous report on this compound. The antiferromagnetic transition is also visible in the thermal transport data, thereby suggesting a close connection between the electronic and lattice degrees of freedom in this Sn-based quasi-skutterudite. The temperature dependence of rho(T) is analyzed in terms of a power-law for resistivity pertinent to Fermi liquid picture. Giant, positive magnetoresistance (MR) approximate to 80% is observed in Gd3Ir4Sn13 at 2K with the application of 9 T. The giant MR and the double magnetic transition can be attributed to the quasi-cages and layered antiferromagnetic structure of Gd3Ir4Sn13 vulnerable to structural distortions and/or dipolar or spin-reorientation effects. The giant value of MR observed in this class of 3: 4: 13 type alloys, especially in a Gd-compound, is the highlight of this work. (C) 2016 AIP Publishing LLC.