Issue
EPL
Volume 85, Number 4, February 2009
Article Number 47004
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/85/47004
Published online 03 March 2009
EPL, 85 (2009) 47004
DOI: 10.1209/0295-5075/85/47004

Large magnetic entropy change near room temperature in antiperovskite SnCMn3

B. S. Wang1, P. Tong1, 2, Y. P. Sun1, X. Luo1, X. B. Zhu1, G. Li1, X. D. Zhu1, S. B. Zhang1, Z. R. Yang1, W. H. Song1 and J. M. Dai1

1   Key Laboratory of Materials Physics, Institute of Solid State Physics, and High Magnetic Field Laboratory, Chinese Academy of Sciences - Hefei 230031, PRC
2   Department of Physics, University of Virginia - Charlottesville, VA 22904, USA

tongpeng@issp.ac.cn
ypsun@issp.ac.cn

received 14 November 2008; accepted in final form 28 January 2009; published February 2009
published online 3 March 2009

Abstract
We report the observation of a large magnetocaloric effect near room temperature in the antiperovskite SnCMn3. The maximal magnetic entropy change at the first-order ferrimagnetic-paramagnetic transition temperature ($T_{{\rm C}}$ ~ 279 K) is about 80.69 mJ/cm3 K and 133 mJ/cm3 K under a magnetic field of 20 kOe and of 48 kOe, respectively. These values are close to those of typical magnetocaloric materials. The large magnetocaloric effect is associated with the sharp change of lattice, resistivity and magnetization in the vicinity of $T_{{\rm C}}$. Through the measurements of the Seebeck coefficient and normal Hall effect, the title system is found to undergo a reconstruction of the electronic structure at $T_{{\rm C}}$. Considering its low-cost and innocuous raw materials, Mn-based antiperovskite compounds are suggested to be appropriate for pursuing new materials with larger magnetocaloric effect.

PACS
75.30.Sg - Magnetocaloric effect, magnetic cooling.
75.50.Gg - Ferrimagnetics.
75.30.Kz - Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.).

© EPLA 2009