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.

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
• Public URL: https://durham-repository.worktribe.com/output/1374437
• Related Public URLs: arxiv.org/abs/1607.05117