6533b861fe1ef96bd12c5045
RESEARCH PRODUCT
Quantum critical point in the itinerant ferromagnet Ni$_{1-x}$Rh$_x$
Theo SiegristKyle BayliffGraeme LukeGraeme LukeB. SpießB. SpießAlannah HallasAlannah HallasYipeng CaiKai GrubeTiglet BesaraChien-lung HuangEmilia MorosanJ. BeareS. Kuntzsubject
PhysicsCondensed matter physicsStrongly Correlated Electrons (cond-mat.str-el)Relaxation (NMR)Zero (complex analysis)General Physics and AstronomyOrder (ring theory)FOS: Physical sciencesMuon spin spectroscopy01 natural sciencesCondensed Matter - Strongly Correlated ElectronsMagnetizationFerromagnetismQuantum critical point0103 physical sciences010306 general physicsTemperature limitdescription
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 $\alpha_{V}/T$ and the Gr\"uneisen ratio $\Gamma = \alpha_{V}/C_{el}$ both diverge logarithmically in the low temperature limit, further indication of a ferromagnetic quantum critical point in Ni$_{1-x}$Rh$_x$.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-01-15 |