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Applied Physics Letters / Volume 96 / Issue 22 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 96, 222509 (2010); http://dx.doi.org/10.1063/1.3446843 (3 pages)

The origin of large overestimation of the magnetic entropy changes calculated directly by Maxwell relation

Weibin Cui, Wei Liu, and Zhidong Zhang

Shenyang National Laboratory for Materials Science, Institute of Metal Research and International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China

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(Received 26 March 2010; accepted 16 May 2010; published online 4 June 2010)

By investigating the nature of the first-order magnetostructural phase transition, we point out the origin of large overestimation of magnetic entropy changes calculated by directly applying the Maxwell relation. Furthermore, if the mass variations in ferromagnetic and paramagnetic phases on temperature are taken into consideration in two-phase region, taking MnAsCx, (Mn, Al)As, and Mn0.994Fe0.004As compounds as example, based on the modified Maxwell relation, the large overestimation and discrepancy of magnetic entropy changes disappear. The magnetic entropy changes are equivalent with the values by Clausius–Claperyon equation, indicating the validity of this modified approach.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

aluminium compounds, entropy, ferromagnetic materials, ferromagnetic-paramagnetic transitions, iron compounds, manganese compounds, Maxwell equations, paramagnetic materials, solid-state phase transformations

PACS

  • 75.30.Kz

    Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

  • 75.20.Ck

    Nonmetals

  • 65.40.gd

    Entropy

  • 64.70.K-

    Solid-solid transitions

  • 75.50.Dd

    Nonmetallic ferromagnetic materials

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3446843

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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