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Lattice-site-specific spin dynamics in double perovskite Sr2CoOsO6.

Yan, Binghai and Paul, Avijit Kumar and Kanungo, Sudipta and Reehuis, Manfred and Hoser, Andreas and Többens, Daniel M. and Schnelle, Walter and Williams, Robert C. and Lancaster, Tom and Xiao, Fan and Möller, Johannes S. and Blundell, Stephen J. and Hayes, William and Felser , Claudia and Jansen, Martin (2014) 'Lattice-site-specific spin dynamics in double perovskite Sr2CoOsO6.', Physical review letters., 112 (14). p. 147202.


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.

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Publisher 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.
Date accepted:24 March 2014
Date deposited:13 May 2014
Date of first online publication:10 April 2014
Date first made open access:No date available

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