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Effect of disorder on a pressure-induced z = 1 magnetic quantum phase transition.

Mannig, A. and Möller, J. S. and Thede, M. and Hüvonen, D. and Lancaster, T. and Xiao, F. and Williams, R.C. and Guguchia, Z. and Khasanov, R. and Morenzoni, E. and Zheludev, A. (2016) 'Effect of disorder on a pressure-induced z = 1 magnetic quantum phase transition.', Physical review B., 94 (14). p. 144418.

Abstract

Pressure-induced ordering close to a z=1 quantum-critical point is studied in the presence of bond disorder in the quantum spin system (C4H12N2)Cu2(Cl1−xBrx)6 (PHCX) by means of muon-spin rotation and relaxation. As for the pure system (C4H12N2)Cu2Cl6, pressure allows PHCX with small levels of disorder (x≤7.5%) to be driven through a quantum-critical point separating a low-pressure quantum paramagnetic phase from magnetic order at high pressures. However, the pressure-induced ordered state is highly inhomogeneous for disorder concentrations x>1%. This behavior might be related to the formation of a quantum Griffiths phase above a critical disorder concentration 7.5%<xc<15%. Br substitution increases the critical pressure and suppresses critical temperatures and ordered moment sizes.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1103/PhysRevB.94.144418
Publisher statement:Reprinted with permission from the American Physical Society: Mannig, A. and Möller, J. S. and Thede, M. and Hüvonen, D. and Lancaster, T. and Xiao, F and Williams, R.C. and Guguchia, Z. and Khasanov, R. and Morenzoni, E. and Zheludev, A. (2016) 'Effect of disorder on a pressure-induced z = 1 magnetic quantum phase transition.', Physical review B., 94 (14). p. 144418 © 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.
Date accepted:14 October 2016
Date deposited:03 November 2016
Date of first online publication:14 October 2016
Date first made open access:03 November 2016

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