Quantum Griffiths Phase Inside the Ferromagnetic Phase of Ni1xVx

Ruizhe Wang, Adane Gebretsadik, Sara Ubaid-Kassis, Almut Schroeder, Thomas Vojta, Peter J. Baker, Francis L. Pratt, Stephen J. Blundell, Tom Lancaster, Isabel Franke, Johannes S. Möller, and Katharine Page
Phys. Rev. Lett. 118, 267202 – Published 28 June 2017
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Abstract

We study by means of bulk and local probes the d-metal alloy Ni1xVx close to the quantum critical concentration, xc11.6%, 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.

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  • Received 22 December 2016

DOI:https://doi.org/10.1103/PhysRevLett.118.267202

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Ruizhe Wang1, Adane Gebretsadik1, Sara Ubaid-Kassis1,*, Almut Schroeder1, Thomas Vojta2, Peter J. Baker3, Francis L. Pratt3, Stephen J. Blundell4, Tom Lancaster4,†, Isabel Franke4, Johannes S. Möller4,‡, and Katharine Page5

  • 1Physics Department, Kent State University, Kent, Ohio 44242, USA
  • 2Department of Physics, Missouri University of Science and Technology, Rolla, Missouri 65409, USA
  • 3ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Oxford, Oxfordshire OX11 0QX, United Kingdom
  • 4Clarendon Laboratory, Department of Physics, Oxford University, Parks Road, Oxford OX1 3PU, United Kingdom
  • 5Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

  • *Present address: Department of Engineering Science, Sonoma State University, Rohnert Park, California 94928, USA.
  • Present address: Centre for Materials Physics, Durham University, South Road, Durham DH1 3LE, United Kingdom.
  • Present address: Neutron Scattering and Magnetism, Laboratory for Solid State Physics, ETH Zürich, CH-8093 Zürich, Switzerland.

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Issue

Vol. 118, Iss. 26 — 30 June 2017

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