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Asymmetry of the latent heat signature in b-axis oriented single crystal Gd5Si2Ge2

Published online by Cambridge University Press:  21 April 2011

K. Morrison ,
V.K. Pecharsky ,
K.A. Gschneidner Jr.  and
L.F. Cohen
K. Morrison
Affiliation:
Blackett Laboratory, Prince Consort Rd, London SW7 2BZ, UK
V.K. Pecharsky
Affiliation:
Ames Laboratory of the U.S. Department of Energy, and Department of Materials Science and Engineering, Iowa State University, Ames, Iowa, 50011-3020, USA
K.A. Gschneidner Jr.
Affiliation:
Ames Laboratory of the U.S. Department of Energy, and Department of Materials Science and Engineering, Iowa State University, Ames, Iowa, 50011-3020, USA
L.F. Cohen
Affiliation:
Blackett Laboratory, Prince Consort Rd, London SW7 2BZ, UK
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Abstract

A 100 micron fragment of a b-axis oriented single crystal Gd5Si2Ge2 has been studied using microcalorimetry, enabling the separate measurement of the heat capacity and the latent heat. The sample was taken from the same crystal previously studied with Hall probe imaging, which showed that the phase transition is seeded by a second phase of Gd5Si1.5Ge1.5 nanoplatelets on the increasing field sweep direction only. The multiple transition features observed in the latent heat signature suggests a nucleation size of approximately 20 μm, consistent with the lengthscale suggested by Hall imaging. The difference in nucleation and growth process with field sweep direction is clearly identified in the latent heat. We show that the latent heat contribution to the entropy change is of the order of 50% of the total entropy change and unlike other systems studied, the transition does not broaden (and the latent heat contribution does not diminish significantly) as magnetic field and temperature are increased within the parameter range explored in these experiments.

Keywords

magnetic propertiesGdnucleation & growth
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1310: Symposium FF – Magnetocalorics and Magnetic Cooling , 2011 , mrsf10-1310-ff03-17
Copyright
Copyright © Materials Research Society 2011

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References

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