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Critical Phenomena at the Antiferromagnetic Transition in MnO

Published online by Cambridge University Press:  10 February 2011

B.F. Woodfield ,
J.L. Shapiro ,
R. Stevens ,
J. Boerio-Goates  and
M.L. Wilson
B.F. Woodfield
Affiliation:
Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602 [email protected]
J.L. Shapiro
Affiliation:
Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602 [email protected]
R. Stevens
Affiliation:
Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602 [email protected]
J. Boerio-Goates
Affiliation:
Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602 [email protected]
M.L. Wilson
Affiliation:
University of Tulsa, Department of Physics, Tulsa, OK 74104
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Abstract

The specific heat of a polycrystalline sample of MnO was measured from T ≈ 1 K to T ≈ 400 K using two different experimental apparatuses at zero applied pressure. Features revealed by the data include a hyperfine contribution due to the Mn nuclei, a T2 temperature dependence at low temperatures due to the type-II antiferromagnetic magnon contribution, and a sharp but well defined antiferromagnetic transition (TN = 117.7095 K) that is clearly second order in nature. The critical exponent, α, deduced from the transition is consistent with a two dimensional Ising model. The specific heat of MnO is also compared with recent results on the type-A antiferromagnet LaMnO3.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 602: Symposium JJ – Magnetoresistive Oxides & Related Materials , 1999 , 245
Copyright
Copyright © Materials Research Society 2000

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