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Competing Magnetic Interactions in Magnetoelectric YbMnO3

Published online by Cambridge University Press:  31 January 2011

Shishir Ray ,
Ying Zou ,
Mark S. Williamsen ,
Somaditya Sen ,
Larry Buroker  and
Prasenjit Guptasarma
Shishir Ray
Affiliation:
[email protected], University of Wisconsin-Milwaukee, Physics, Milwaukee, Wisconsin, United States
Ying Zou
Affiliation:
[email protected], University of Wisconsin-Milwaukee, Physics, Milwaukee, Wisconsin, United States
Mark S. Williamsen
Affiliation:
[email protected], University of Wisconsin-Milwaukee, Physics, Milwaukee, Wisconsin, United States
Somaditya Sen
Affiliation:
[email protected], University of Wisconsin-Milwaukee, Physics, Milwaukee, Wisconsin, United States
Larry Buroker
Affiliation:
[email protected], University of Wisconsin-Milwaukee, Physics, Milwaukee, Wisconsin, United States
Prasenjit Guptasarma
Affiliation:
[email protected], University of Wisconsin-Milwaukee, Physics, Milwaukee, Wisconsin, United States
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Abstract

We clarify here certain aspects of the magnetic field (H) – temperature (T) phase diagram of YbMnO3, a hexagonal Rare-Earth manganite oxide in which two multiferroic ordered states – ferroelectricity and antiferromagnetism coexist at low temperature. Single crystals of YbMnO3 were carefully grown from a Floating Zone (FZ) at low speed, then oriented and studied at variable temperature and magnetic field. Magnetization and heat capacity measurement show features corresponding to the antiferromagnetic (AFM) ordering of Mn3+, and the rare earth Yb3+. We find that the ordering temperature of Mn3+ is independent of applied magnetic field up to 5T. However, contrary to previous reports in flux-grown crystals, we do not observe a complete suppression of Yb3+ order above 0.1T. Instead, we find that Yb3+ remains at least up to 1 T, suggesting a revision of our current understanding of the ordering mechanism of the Mn-Yb and Yb –Yb sub-lattices in this hexagonal structure.

Keywords

zone meltingmagneticYb
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1161: Symposium I – Engineered Multiferroics–Magnetoelectric Interactions, Sensors and Devices , 2009 , 1161-I07-05
Copyright
Copyright © Materials Research Society 2009

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