Volume 81, Number 4, February 2008
|Number of page(s)||4|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||15 January 2008|
Giant magnetocaloric effect and soft-mode magneto-structural phase transition in MnAs
State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences Beijing 100080, China
2 Functional Materials Research Institute, Central Iron and Steel Research Institute Beijing 100081, China
3 Department of Physics, Kyushu University - Higashi-ku, Fukuoka 812-8581, Japan
Corresponding author: email@example.com
Accepted: 10 December 2007
Maxwell relation and mean-field approximation are chosen to estimate the total entropy change and the magnetic entropy change, respectively. The experimental results are exactly consonant with the theoretical results. Consequently, the magnetic entropy changes make up the majority of the total entropy change, and the lattice entropy changes are small. The giant magnetocaloric effect in MnAs is clarified. According to thermodynamics discussion, the modulus of compression and the stress at TC decrease dramatically. Therefore, the magneto-structural phase transition in MnAs is a kind of soft mode.
PACS: 75.30.Sg – Magnetocaloric effect, magnetic cooling / 75.30.Kz – Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.) / 61.50.Ks – Crystallographic aspects of phase transformations; pressure effects
© EPLA, 2008
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