Lattice-Site-Specific Spin Dynamics in Double Perovskite Sr2CoOsO6

Binghai, Yan; Paul, Avijit Kumar; Kanungo, Sudipta; Reehuis, Manfred; Hoser, Andreas; Többens, Daniel M.; Schnelle, Walter; Williams, Robert C.; Lancaster, Tom; Xiao, Fan; Möller, Johannes S.; Blundell, Stephen J.; Hayes, William; Felser, Claudia; Jansen, Martin

doi:10.1103/physrevlett.112.147202

Lattice-Site-Specific Spin Dynamics in Double Perovskite Sr2CoOsO6

Binghai, Yan; Paul, Avijit Kumar; Kanungo, Sudipta; Reehuis, Manfred; Hoser, Andreas; Többens, Daniel M.; Schnelle, Walter; Williams, Robert C.; Lancaster, Tom; Xiao, Fan; Möller, Johannes S.; Blundell, Stephen J.; Hayes, William; Felser, Claudia; Jansen, Martin

Authors

Yan Binghai

Avijit Kumar Paul

Sudipta Kanungo

Manfred Reehuis

Andreas Hoser

Daniel M. Többens

Walter Schnelle

Robert C. Williams

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

Fan Xiao

Johannes S. Möller

Stephen J. Blundell

William Hayes

Claudia Felser

Martin Jansen

Abstract

Magnetic properties and spin dynamics have been studied for the structurally ordered double perovskite Sr2CoOsO6. Neutron diffraction, muon-spin relaxation, and ac-susceptibility measurements reveal two antiferromagnetic (AFM) phases on cooling from room temperature down to 2 K. In the first AFM phase, with transition temperature TN1=108 K, cobalt (3d7, S=3/2) and osmium (5d2, S=1) moments fluctuate dynamically, while their average effective moments undergo long-range order. In the second AFM phase below TN2=67 K, cobalt moments first become frozen and induce a noncollinear spin-canted AFM state, while dynamically fluctuating osmium moments are later frozen into a randomly canted state at T≈5 K. Ab initio calculations indicate that the effective exchange coupling between cobalt and osmium sites is rather weak, so that cobalt and osmium sublattices exhibit different ground states and spin dynamics, making Sr2CoOsO6 distinct from previously reported double-perovskite compounds.

Citation

Binghai, Y., Paul, A. K., Kanungo, S., Reehuis, M., Hoser, A., Többens, D. M., …Jansen, M. (2014). Lattice-Site-Specific Spin Dynamics in Double Perovskite Sr2CoOsO6. Physical Review Letters, 112(14), Article 147202. https://doi.org/10.1103/physrevlett.112.147202

Journal Article Type	Article
Acceptance Date	Mar 24, 2014
Online Publication Date	Apr 10, 2014
Publication Date	Apr 10, 2014
Deposit Date	May 2, 2014
Publicly Available Date	May 13, 2014
Journal	Physical Review Letters
Print ISSN	0031-9007
Electronic ISSN	1079-7114
Publisher	American Physical Society
Peer Reviewed	Peer Reviewed
Volume	112
Issue	14
Article Number	147202
DOI	https://doi.org/10.1103/physrevlett.112.147202

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Copyright Statement
Reprinted with permission from the American Physical Society: Binghai Yan, Avijit Kumar Paul, Sudipta Kanungo, Manfred Reehuis, Andreas Hoser, Daniel M. Többens, Walter Schnelle, Robert C. Williams, Tom Lancaster, Fan Xiao, Johannes S. Möller, Stephen J. Blundell, William Hayes, Claudia Felser, and Martin Jansen, Physical Review Letters, 112, 147202, 2014. © 2014 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.