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

Mannig, A.; Möller, J.S.; Thede, M.; Hüvonen, D.; Lancaster, T.; Xiao, F.; Williams, R.C.; Guguchia, Z.; Khasanov, R.; Morenzoni, E.; Zheludev, A.

doi:10.1103/physrevb.94.144418

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

Mannig, A.; Möller, J.S.; Thede, M.; Hüvonen, D.; Lancaster, T.; Xiao, F.; Williams, R.C.; Guguchia, Z.; Khasanov, R.; Morenzoni, E.; Zheludev, A.

Authors

A. Mannig

J.S. Möller

M. Thede

D. Hüvonen

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

F. Xiao

R.C. Williams

Z. Guguchia

R. Khasanov

E. Morenzoni

A. Zheludev

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%

Citation

Mannig, A., Möller, J., Thede, M., Hüvonen, D., Lancaster, T., Xiao, F., …Zheludev, A. (2016). Effect of disorder on a pressure-induced z = 1 magnetic quantum phase transition. Physical Review B, 94(14), Article 144418. https://doi.org/10.1103/physrevb.94.144418

Journal Article Type	Article
Acceptance Date	Oct 14, 2016
Online Publication Date	Oct 14, 2016
Publication Date	Oct 1, 2016
Deposit Date	Oct 17, 2016
Publicly Available Date	Nov 3, 2016
Journal	Physical Review B
Print ISSN	2469-9950
Electronic ISSN	2469-9969
Publisher	American Physical Society
Peer Reviewed	Peer Reviewed
Volume	94
Issue	14
Article Number	144418
DOI	https://doi.org/10.1103/physrevb.94.144418
Related Public URLs	arxiv.org/abs/1607.05117

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Copyright 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.