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Spin Jahn-Teller antiferromagnetism in CoTi2O5.

Kirschner, Franziska K. K. and Johnson, Roger D. and Lang, Franz and Khalyavin, Dmitry D. and Manuel, Pascal and Lancaster, Tom and Prabhakaran, Dharmalingam and Blundell, Stephen J. (2019) 'Spin Jahn-Teller antiferromagnetism in CoTi2O5.', Physical review B., 99 (6). 064403.


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.

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Publisher 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.
Date accepted:22 January 2019
Date deposited:07 February 2019
Date of first online publication:04 February 2019
Date first made open access:07 February 2019

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