Quantum Griffiths phase inside the ferromagnetic phase of Ni1-xVx

Wang, Ruizhe; Gebretsadik, Adane; Ubaid-Kassis, Sara; Schroeder, Almut; Vojta, Thomas; Baker, Peter J.; Pratt, Francis L.; Blundell, Stephen J.; Lancaster, Tom; Franke, Isabel; Möller, Johannes S.; Page, Katharine

Abstract

We study by means of bulk and local probes the d-metal alloy Ni1-xVx close to the quantum critical concentration, x_c \approx 11.6\%, where the ferromagnetic transition temperature vanishes. The magnetization-field curve in the ferromagnetic phase takes an anomalous power-law form with a nonuniversal exponent that is strongly x-dependent and mirrors the behavior in the paramagnetic phase. Muon spin rotation experiments demonstrate inhomogeneous magnetic order and indicate the presence of dynamic fluctuating magnetic clusters. These results provide strong evidence for a quantum Griffiths phase on the ferromagnetic side of the quantum phase transition.

Citation

Wang, R., Gebretsadik, A., Ubaid-Kassis, S., Schroeder, A., Vojta, T., Baker, P. J., …Page, K. (2017). Quantum Griffiths phase inside the ferromagnetic phase of Ni1-xVx. Physical Review Letters, 118(26), Article 267202. https://doi.org/10.1103/physrevlett.118.267202

• Journal Article Type: Article
• Acceptance Date: May 30, 2017
• Online Publication Date: Jun 28, 2017
• Publication Date: Jun 28, 2017
• Deposit Date: Jun 6, 2017
• Publicly Available Date: Jul 5, 2017
• Journal: Physical Review Letters
• Print ISSN: 0031-9007
• Electronic ISSN: 1079-7114
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 118
• Issue: 26
• Article Number: 267202
• DOI: https://doi.org/10.1103/physrevlett.118.267202
• Public URL: https://durham-repository.worktribe.com/output/1355967