Evolution of critical scaling behavior near a ferromagnetic quantum phase transition

TL;DR

This study investigates how magnetic critical scaling behavior changes near a ferromagnetic quantum phase transition in URu2-xRexSi2, revealing unique trends in critical exponents linked to the interplay of Kondo and ferromagnetic interactions.

Contribution

It provides new insights into the evolution of critical exponents near a ferromagnetic quantum phase transition, highlighting a distinct behavior compared to other known quantum critical ferromagnets.

Findings

Critical exponents gamma and (delta-1) decrease to zero as the transition is approached.

The exponent beta remains constant across the transition.

The observed trends suggest a competition between Kondo and ferromagnetic interactions.

Abstract

Magnetic critical scaling in URu2-xRexSi2 single crystals continuously evolves as the ferromagnetic critical temperature is tuned towards zero via chemical substitution. As the quantum phase transition is approached, the critical exponents gamma and (delta-1) decrease to zero in tandem with the critical temperature and ordered moment, while the exponent beta remains constant. This novel trend distinguishes URu2-xRexSi2 from stoichiometric quantum critical ferromagnets and appears to reflect an underlying competition between Kondo and ferromagnetic interactions.