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Quantum Griffiths Phase in the Weak Itinerant Ferromagnetic Alloy Ni₁₋ₓVₓ
Physical Review Letters
  • Sara Ubaid-Kassis
  • Thomas Vojta, Missouri University of Science and Technology
  • Almut Schroeder

We present magnetization (M) data of the d-metal alloy Ni1-xVx at vanadium concentrations close to xx ~ 11.4% where the onset of long-range ferromagnetic (FM) order is suppressed to zero temperature. Above xc, the temperature (T) and magnetic field (H) dependencies of the magnetization are best described by simple nonuniversal power laws. the exponents of M/H ~ T γ and M ~ Hα are related by 1-γ=α for wide temperature (10c to γ<0.1 for x=15%. This behavior is not compatible with either classical or quantum critical behavior in a clean 3D FM. Instead it closely follows the predictions for a quantum Griffiths phase associated with a quantum phase transition in a disordered metal. Deviations at the lowest temperatures hint at a freezing of large clusters and the onset of a cluster glass phase.

National Science Foundation (U.S.)
Research Corporation
Keywords and Phrases
  • Nanocrystalline Alloys,
  • Phase Transitions,
  • Ferromagnetic materials,
  • Ferromagnetism,
  • Magnetic fields
Document Type
Article - Journal
Document Version
Final Version
File Type
© 2010 American Physical Society (APS), All rights reserved.
Publication Date
Publication Date
01 Feb 2010
Citation Information
Sara Ubaid-Kassis, Thomas Vojta and Almut Schroeder. "Quantum Griffiths Phase in the Weak Itinerant Ferromagnetic Alloy Ni₁₋ₓVₓ" Physical Review Letters (2010) ISSN: 0031-9007
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