Magnetization dynamics and frustration in the multiferroic double perovskite Lu2MnCoO6

Zapf, V.S.; Ueland, B.G.; Laver, M.; Lonsky, M.; Pohlit, M.; Muller, J.; Lancaster, T.; Moller, J.S.; Blundell, S.J.; Singleton, J.; Mira, J.; Yanez-Vilar, S.; Senarıs-Rodrıguez, M.A.

doi:10.1103/physrevb.93.134431

Magnetization dynamics and frustration in the multiferroic double perovskite Lu2MnCoO6

Zapf, V.S.; Ueland, B.G.; Laver, M.; Lonsky, M.; Pohlit, M.; Muller, J.; Lancaster, T.; Moller, J.S.; Blundell, S.J.; Singleton, J.; Mira, J.; Yanez-Vilar, S.; Senarıs-Rodrıguez, M.A.

Authors

V.S. Zapf

B.G. Ueland

M. Laver

M. Lonsky

M. Pohlit

J. Muller

Professor Tom Lancaster tom.lancaster@durham.ac.uk
Professor

J.S. Moller

S.J. Blundell

J. Singleton

J. Mira

S. Yanez-Vilar

M.A. Senarıs-Rodrıguez

Abstract

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.

Citation

Zapf, V., Ueland, B., Laver, M., Lonsky, M., Pohlit, M., Muller, J., …Senarıs-Rodrıguez, M. (2016). Magnetization dynamics and frustration in the multiferroic double perovskite Lu2MnCoO6. Physical Review B, 93(13), Article 134431. https://doi.org/10.1103/physrevb.93.134431

Journal Article Type	Article
Acceptance Date	Apr 11, 2016
Online Publication Date	Apr 29, 2016
Publication Date	Apr 29, 2016
Deposit Date	May 12, 2016
Publicly Available Date	May 17, 2016
Journal	Physical Review B
Print ISSN	2469-9950
Electronic ISSN	2469-9969
Publisher	American Physical Society
Peer Reviewed	Peer Reviewed
Volume	93
Issue	13
Article Number	134431
DOI	https://doi.org/10.1103/physrevb.93.134431
Related Public URLs	http://arxiv.org/abs/1409.5072

Files

Published Journal Article (841 Kb)
PDF

Copyright 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.