Spin-Fluctuation Effects Near the Quantum Phase Transition of the Ising-Type Itinerant Ferromagnet URhAl

Yusei Shimizu, Daniel Braithwaite, Bernard Salce, Tristan Combier, Dai Aoki, Jacques Flouquet

Research output: Contribution to journalConference articlepeer-review


We performed high-pressure resistivity measurements for an Ising-type itinerant ferromagnet URhAl at low temperatures down to 40 mK. In URhAl, the Curie temperature (TC) is sufficiently suppressed with increasing pressure and TC suddenly disappears at the critical pressure Pc ∼ 5.2 GPa. Above Pc, we observed the large enhancement of the A coefficient of AT 2 resistivity term, which is defined below T∗(P). Near Pc, the exponent (n) of resistivity, ρ(T) = ρ0 + A'T n, approaches n ∼ 5/3, which is suggested from the spin-fluctuation theory for a three dimensional itinerant ferromagnetic system. We observed the non-Fermi-liquid behavior of resistivity under high pressure far above Pc up to ∼ 7.5 GPa. On the other hand, the critical behaviors of T∗(P) and A(P) for URhAl do not obey the spin-fluctuation theory for a ferromagnetic quantum critical point, where the Curie temperature vanishes as a second-order phase transition. The sudden disappearance of TC support the change of nature of transition from second-order to first-order in URhAl near Pc. Furthermore, the pressure dependences of A(P) and ρ0(P) are asymmetric around Pc, and these behaviors might be explained by a remarkable Fermi-surface change, which accompanies the ferromagnetic-paramagnetic quantum phase transition in URhAl.

Original languageEnglish
Pages (from-to)397-404
Number of pages8
JournalPhysics Procedia
Publication statusPublished - 2015
Event20th International Conference on Magnetism, ICM 2015 - Barcelona, Spain
Duration: 2015 Jul 52015 Jul 10


  • Ferromagnetic spin fluctuation
  • Itinerant ferromagnet
  • Quantum phase transition


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