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Magnetization dynamics and frustration in the multiferroic double perovskite Lu2MnCoO6.

Zapf, V. S. and Ueland, B. G. and Laver, M. and Lonsky, M. and Pohlit, M. and Muller, J. and Lancaster, T. and Moller, J.S. and Blundell, S.J. and Singleton, J. and Mira, J. and Yanez-Vilar, S. and Senarıs-Rodrıguez, M. A. (2016) 'Magnetization dynamics and frustration in the multiferroic double perovskite Lu2MnCoO6.', Physical review B., 93 (13). p. 134431.


We investigate the magnetic ordering and the magnetization dynamics (from kHz to THz time scales) of the double perovskite Lu2MnCoO6 using elastic neutron diffraction, muon spin relaxation, and micro-Hall magnetization measurements. This compound is known to be a type II multiferroic with the interesting feature that a ferromagneticlike magnetization hysteresis loop couples to an equally hysteretic electric polarization in the bulk of the material despite a zero-field magnetic ordering of the type ↑↑↓↓ along Co-Mn spin chains. Here we explore the unusual dynamics of this compound and find extremely strong fluctuations, consistent with the axial next-nearest-neighbor Ising (ANNNI) model for frustrated spin chains. We identify three temperature scales in Lu2MnCoO6 corresponding to the onset of highly fluctuating long-range order below TN=50±3 K identified from neutron scattering, the onset of magnetic and electric hysteresis, with change in kHz magnetic and electric dynamics below a 30 K temperature scale, and partial freezing of ∼MHz spin fluctuations in the muon spin relaxation data below 12±3 K. Our results provide a framework for understanding the multiferroic behavior of this compound and its hysteresis and dynamics.

Item Type:Article
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Publisher statement:Reprinted with permission from the American Physical Society: Physical Review B 93, 134431 © 2016 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:11 April 2016
Date deposited:17 May 2016
Date of first online publication:29 April 2016
Date first made open access:17 May 2016

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