Electron paramagnetic resonance studies on multiferroic DyMnO3 and Dy0.5Sr0.5MnO3

Harikrishnan, S and Kumar, CM Naveen and Rao, SS and Bhat, HL and Bhat, SV and Elizabeth, Suja (2008) Electron paramagnetic resonance studies on multiferroic DyMnO3 and Dy0.5Sr0.5MnO3. In: Journal of Applied Physics, 104 (2).

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Abstract

Electron paramagnetic resonance (EPR) studies and magnetic measurements were carried out on single crystals of multiferroic DyMnO3 in hexagonal as well as orthorhombic structures. The interesting effect of strontium dilution on the frustrated antiferromagnetism of DyMnO3 is also probed using EPR. The line shapes are fitted to broad Lorentzian in the case of pure DyMnO3 and to modified Dysonian in the case of Dy0.5Sr0.5MnO3. The linewidth, integrated intensity, and geff derived from the signals are analyzed as a function of temperature. The results of magnetization measurements corroborate with EPR results. Our study clearly reveals the signature of frustrated magnetism in pure DyMnO3 systems. It is found that antiferromagnetic correlations in these systems persist even above the transition. Moreover, a spin-glass-like behavior in Dy0.5Sr0.5MnO3 is indicated by a steplike feature in the EPR signals at low fields.

Item Type:	Journal Article
Publication:	Journal of Applied Physics
Publisher:	American Institute of Physics
Additional Information:	Copyright of this article belongs to American Institute of Physics.
Keywords:	Magnetization curves;hysteresis;Barkhausen and related effects;Antiferromagnetics;Electron paramagnetic resonance and relaxation.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	30 Mar 2010 12:14
Last Modified:	19 Sep 2010 05:57
URI:	http://eprints.iisc.ac.in/id/eprint/26284

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