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Magnetic phase diagrams of multiferroic hexagonal RMnO3 (R = Er, Yb, Tm, and Ho)

Published online by Cambridge University Press:  31 January 2011

F. Yen ,
C. dela Cruz ,
B. Lorenz ,
E. Galstyan ,
Y.Y. Sun ,
M. Gospodinov  and
C.W. Chu
F. Yen*
Affiliation:
Department of Physics and Texas Center for Superconductivity at the University of Houston, University of Houston, Houston, Texas 77204-5002
C. dela Cruz
Affiliation:
Department of Physics and Texas Center for Superconductivity at the University of Houston, University of Houston, Houston, Texas 77204-5002
B. Lorenz
Affiliation:
Department of Physics and Texas Center for Superconductivity at the University of Houston, University of Houston, Houston, Texas 77204-5002
E. Galstyan
Affiliation:
Department of Physics and Texas Center for Superconductivity at the University of Houston, University of Houston, Houston, Texas 77204-5002
Y.Y. Sun
Affiliation:
Department of Physics and Texas Center for Superconductivity at the University of Houston, University of Houston, Houston, Texas 77204-5002
M. Gospodinov
Affiliation:
Institute of Solid State Physics, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria
C.W. Chu
Affiliation:
Department of Physics and Texas Center for Superconductivity at the University of Houston, University of Houston, Houston, Texas 77204-5002; Lawrence Berkeley National Laboratory, Berkeley, California 94720; and Hong Kong University of Science and Technology, Hong Kong, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: fyen18@hotmail.com
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Abstract

The magnetic phase diagrams of RMnO3 (R = Er, Yb, Tm, Ho) are investigated up to 14 T via magnetic and dielectric measurements. The stability range of the atomic force microscopy order below the Néel temperature of the studied RMnO3 extends to far higher magnetic fields than previously assumed. Magnetic irreversibility indicating the presence of a spontaneous magnetic moment is found near 50 K for R = Er, Yb, and Tm. At very low temperatures and low magnetic fields, the phase boundary defined by the ordering of the rare-earth moments is resolved. The sizable dielectric anomalies observed along all phase boundaries are evidence for strong spin-lattice coupling in the hexagonal RMnO3. In HoMnO3, the strong magnetoelastic distortions are investigated in more detail via magnetostriction experiments up to 14 T. The results are discussed based on existing data on magnetic symmetries and the interactions among the Mn-spins, the rare-earth moments, and the lattice.

Keywords

DielectricMagnetic propertiesPhase transformation
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 8 , August 2007 , pp. 2163 - 2173
Copyright
Copyright © Materials Research Society 2007

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References

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