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An X- and Q-band Gd3+ EPR study of a single crystal of EuAlO3: EPR linewidth variation with temperature and low-symmetry effects

Title:

An X- and Q-band Gd3+ EPR study of a single crystal of EuAlO3: EPR linewidth variation with temperature and low-symmetry effects

Andronenko, Sergey I. and Andronenko, Roza R. and Misra, Sushil K. (2012) An X- and Q-band Gd3+ EPR study of a single crystal of EuAlO3: EPR linewidth variation with temperature and low-symmetry effects. Physica B: Condensed Matter, 407 (8). pp. 1203-1208. ISSN 09214526

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Official URL: http://dx.doi.org/10.1016/j.physb.2012.01.094

Abstract

Detailed electron paramagnetic resonance (EPR) studies on a single crystal of Gd3+-doped Van-Vleck compound EuAlO3, potentially a phosphorescent/luminescent/laser material, with the Gd3+ ion substituting for the Eu3+ ion, were carried out at X-band (9.2 GHz) over the 77–400 K temperature range. They provide new physical results on magnetic properties of the Eu3+ ion in a low symmetry environment. The asymmetry exhibited by the variation of the Gd3+ EPR line positions for the orientations of the external magnetic field about the Z and X magnetic axes in the ZX plane was ascribed to the existence of low, monoclinic, site symmetry, as revealed by the significant values of the spin-Hamiltonian (SH) parameters and , estimated by fitting all the observed EPR line positions at room temperature for the orientation of the magnetic field in the magnetic ZX plane using a least-square fitting procedure. The temperature dependence of the Gd3+ EPR linewidth is interpreted to be due to the “life-time” broadening, caused by dynamical exchange and dipolar interactions between the impurity Gd3+ ions and the host Eu3+ ions.

Divisions:Concordia University > Faculty of Arts and Science > Physics
Item Type:Article
Refereed:Yes
Authors:Andronenko, Sergey I. and Andronenko, Roza R. and Misra, Sushil K.
Journal or Publication:Physica B: Condensed Matter
Date:2012
Keywords:Gd3+ ion EPR Spin-Hamiltonian parameters EuAlO3 Van-Vleck paramagnet X-band Q-band Lifetime broadening Low symmetry
ID Code:973688
Deposited By:KATHARINE HALL
Deposited On:23 Mar 2012 09:42
Last Modified:23 Mar 2012 09:42
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