Hyperscaling analysis on magnetic susceptibility and specific heat in a ferromagnetic quantum critical point Ni_1-xRh_x with x=0.375

Rong-Zhu Lin^1,2*, Chien-Lung Huang^1,2

¹Physics, National Cheng Kung University, Tainan, Taiwan
²Center for Quantum Frontiers of Research and Technology, National Cheng Kung University, Tainan, Taiwan

* Presenter:Rong-Zhu Lin, email:grab781@gmail.com

A magnetic quantum critical point (QCP) occurs when long-range order is tuned to absolute zero by a nonthermal control parameter.
In the vicinity of a QCP, quantum fluctuations dominate underlying physics in which divergence of thermodynamic properties as temperature approaches zero and hyperscaling could be observed. Here we present hyperscaling analysis using isothermal magnetization and specific heat data, as a function of temperature and magnetic field, for a ferromagnetic QCP Ni_1-xRh_x with x = 0.375 which has been verified in our previous work [Phys. Rev. Lett. 124, 117203 (2020)].

Keywords: Quantum phase transition, Ferromagnetism, Hyperscaling