We report a chemical substitution-induced ferromagnetic quantum critical point in polycrystalline Ni1−xRhx alloys. Through magnetization and muon spin relaxation measurements, we show that the ferromagnetic ordering temperature is suppressed continuously to zero at xcrit ¼ 0.375 while the magnetic volume fraction remains 100% up to xcrit, pointing to a second order transition. Non-Fermi liquid behavior is observed close to xcrit, where the electronic specific heat Cel=T diverges logarithmically, while immediately above xcrit the volume thermal expansion coefficient αV=T and the Grüneisen ratio Γ ¼ αV=Cel both diverge logarithmically in the low temperature limit, further indication of a ferromagnetic quantum critical point in Ni1−xRhx.
Physics, Astronomy, and Materials Science
© 2020 American Physical Society
Huang, C-L., A. M. Hallas, K. Grube, S. Kuntz, B. Spieß, K. Bayliff, T. Besara et al. "Quantum Critical Point in the Itinerant Ferromagnet Ni 1− x Rh x." Physical review letters 124, no. 11 (2020): 117203.
Physical Review Letters