Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 321, Issue 21, Pages 3535-3540Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2008.03.003
Keywords
Magnetostructural phase transition; Magnetocaloric effect; Martensitic phase transition
Funding
- Royal Society
- UK EPSRC [GR/R72235/01]
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We propose the phase diagram of a new pseudo-ternary compound, CoMnGe1-xSnx, in the range x <= 0.1. Our phase diagram is a result of magnetic and calorimetric measurements. We find that the separate magnetic and structural transitions in CoMnGe are tuned together as the level of Sn substitution is increased. We demonstrate the appearance of a hysteretic magneto structural phase transition in the range x = 0.04-0.055, similar to that observed in CoMnGe under hydrostatic pressure. From magnetisation measurements, we show that the isothermal entropy change associated with the magnetostructural transition can be as high as 4.5 JK(-1) kg(-1) in a field of 1T. However, the large thermal hysteresis in this transition (similar to 20K) will limit its straightforward use in a magnetocaloric device. (C) 2008 Elsevier B.V. All rights reserved.
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