Quantum Critical Scaling in the Disordered Itinerant Ferromagnet UCo_{1-x}Fe_{x}Ge.

Abstract

The Belitz-Kirkpatrick-Vojta (BKV) theory shows in excellent agreement with experiment that ferromagnetic quantum phase transitions (QPTs) in clean metals are generally first order due to the coupling of the magnetization to electronic soft modes, in contrast to the classical analogue that is an archetypical second-order phase transition. For disordered metals the BKV theory predicts that the second-order nature of the QPT is restored because the electronic soft modes change their nature from ballistic to diffusive. Our low-temperature magnetization study identifies the ferromagnetic QPT in the disordered metal UCo_{1-x}Fe_{x}Ge as the first clear example that exhibits the associated critical exponents predicted by the BKV theory.

Cite this paper

@article{Huang2016QuantumCS, title={Quantum Critical Scaling in the Disordered Itinerant Ferromagnet UCo_\{1-x\}Fe_\{x\}Ge.}, author={Kevin Huang and S Eley and Priscila F S Rosa and Leonardo Civale and Eric Bauer and Ryan E Baumbach and M. Brian Maple and Marc Janoschek}, journal={Physical review letters}, year={2016}, volume={117 23}, pages={237202} }