Spin Jahn-Teller antiferromagnetism in CoTi2O5

Kirschner, Franziska K.K.; Johnson, Roger D.; Lang, Franz; Khalyavin, Dmitry D.; Manuel, Pascal; Lancaster, Tom; Prabhakaran, Dharmalingam; Blundell, Stephen J.

doi:10.1103/physrevb.99.064403

Spin Jahn-Teller antiferromagnetism in CoTi2O5

Kirschner, Franziska K.K.; Johnson, Roger D.; Lang, Franz; Khalyavin, Dmitry D.; Manuel, Pascal; Lancaster, Tom; Prabhakaran, Dharmalingam; Blundell, Stephen J.

Authors

Franziska K.K. Kirschner

Roger D. Johnson

Franz Lang

Dmitry D. Khalyavin

Pascal Manuel

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

Dharmalingam Prabhakaran

Stephen J. Blundell

Abstract

We have used neutron powder diffraction to solve the magnetic structure of orthorhombic CoTi2O5, showing that the long-range ordered state below 26 K identified in our muon-spin rotation experiments is antiferromagnetic with propagation vector k = (±1 2 , 1 2 , 0) and moment of 2.72(1)μB per Co2+ ion. This long-range magnetic order is incompatible with the experimentally determined crystal structure because the imposed symmetry completely frustrates the exchange coupling. We conclude that the magnetic transition must therefore be accompanied by a spin Jahn-Teller effect which lowers the structural symmetry and thereby relieves the frustration. These results show that CoTi2O5 is a highly unusual low-symmetry material exhibiting a purely spin-driven lattice distortion critical to the establishment of an ordered magnetic ground state.

Citation

Kirschner, F. K., Johnson, R. D., Lang, F., Khalyavin, D. D., Manuel, P., Lancaster, T., …Blundell, S. J. (2019). Spin Jahn-Teller antiferromagnetism in CoTi2O5. Physical Review B, 99(6), Article 064403. https://doi.org/10.1103/physrevb.99.064403

Journal Article Type	Article
Acceptance Date	Jan 22, 2019
Online Publication Date	Feb 4, 2019
Publication Date	Feb 4, 2019
Deposit Date	Feb 5, 2019
Publicly Available Date	Feb 7, 2019
Journal	Physical Review B
Print ISSN	2469-9950
Electronic ISSN	2469-9969
Publisher	American Physical Society
Peer Reviewed	Peer Reviewed
Volume	99
Issue	6
Article Number	064403
DOI	https://doi.org/10.1103/physrevb.99.064403
Related Public URLs	https://arxiv.org/abs/1808.01387

Files

Published Journal Article (1.1 Mb)
PDF

Copyright Statement
Reprinted with permission from the American Physical Society: Kirschner, Franziska K. K., Johnson, Roger D., Lang, Franz, Khalyavin, Dmitry D., Manuel, Pascal, Lancaster, Tom, Prabhakaran, Dharmalingam & Blundell, Stephen J. (2019). Spin Jahn-Teller antiferromagnetism in CoTi2O5. Physical Review B 99(6): 064403 © 2019 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.