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Oh, Yoon Seok
Laboratory for Strong Correlation in Quantum Materials
Research Interests
  • Multiferroic
  • Ferroelectric
  • Quantum Magnetism

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Specific heat of a YCrO3 single crystal as investigated by a Si-N membrane based microcalorimeter

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Title
Specific heat of a YCrO3 single crystal as investigated by a Si-N membrane based microcalorimeter
Author
Kim, J. W.Oh, Yoon SeokSuh, Y. D.Park, Y. D.Kim, Kee Hoon
Issue Date
2007-04
Publisher
ELSEVIER SCIENCE BV
Citation
THERMOCHIMICA ACTA, v.455, no.1, pp.2 - 6
Abstract
We report the specific heat measurement of a YCrO3 single crystal in a wide temperature range from 30 to 360 K by use of a newly designed microcalorimeter with high sensitivity about ∼1 μJ/K. The measured heat capacity data exhibit a λ-like shape at the Néel temperature TN ≈ 140 K as consistent with the second order magnetic transition. When the phonon specific heat is subtracted by use of that of a non-magnetic analogue LaGaO3 with an orthorhombic structure, the remaining entropy is much higher than the expected magnetic entropy from Cr3+ (S = 3/2) ions. We attribute the excess entropy to the additional phonon entropy caused by the monoclinic structure of YCrO3, which can be intimately related to its ferroelectric property. © 2006 Elsevier B.V. All rights reserved.
URI
https://scholarworks.unist.ac.kr/handle/201301/12398
URL
http://www.sciencedirect.com/science/article/pii/S0040603106006125
DOI
10.1016/j.tca.2006.12.007
ISSN
0040-6031
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