Quantum Critical Point in the Itinerant Ferromagnet Ni1xRhx Academic Article uri icon

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  • We report a chemical substitution-induced ferromagnetic quantum critical point in polycrystalline Ni_{1-x}Rh_{x} alloys. Through magnetization and muon spin relaxation measurements, we show that the ferromagnetic ordering temperature is suppressed continuously to zero at x_{crit}=0.375 while the magnetic volume fraction remains 100% up to x_{crit}, pointing to a second order transition. Non-Fermi liquid behavior is observed close to x_{crit}, where the electronic specific heat C_{el}/T diverges logarithmically, while immediately above x_{crit} the volume thermal expansion coefficient α_{V}/T and the Grüneisen ratio Γ=α_{V}/C_{el} both diverge logarithmically in the low temperature limit, further indication of a ferromagnetic quantum critical point in Ni_{1-x}Rh_{x}.


  • Huang, C-L
  • Hallas, AM
  • Grube, K
  • Kuntz, S
  • Spieß, B
  • Bayliff, K
  • Besara, T
  • Siegrist, T
  • Cai, Y
  • Beare, J
  • Luke, Graeme
  • Morosan, E

publication date

  • March 20, 2020