Hybridization driven quantum critical behavior in weakly-itinerant ferromagnets

TL;DR

This paper explores how hybridization influences quantum critical behavior in weakly-itinerant ferromagnets, revealing universal relationships between magnetic properties and electronic structure parameters.

Contribution

It demonstrates that hybridization controls proximity to ferromagnetic instability and establishes universal dependencies on two key electronic parameters.

Findings

Hybridization affects magnetic ground state and transition temperature.

Universal dependence on bandwidth and band center distance.

Control of quantum criticality via electronic structure tuning.

Abstract

We investigate the unusual magnetic properties of nearly-critical, weakly-itinerant ferromagnets with general formula UTX, where T=Rh,Co and X=Ge,Si. As a unique feature about these systems, we show that changes in the V_{df} hybridization control their proximity to a ferromagnetic instability, and determine the evolution of: the ground state magnetization, M_0, the Curie Temperature, T_C, the density of states at the Fermi level, N(E_F), the T^2 resistivity coefficient, A, and the specific heat coefficient, \gamma. The universal aspect of our findings comes from the dependence on only two parameters: the T_d bandwidth, W_d, and the distance between T_d and U_f band centers, C_{T_d}-C_{U_f}.