Universal low-temperature behavior of the CePd_{1-x}Rh_x ferromagnet

TL;DR

This paper demonstrates that the non-Fermi liquid behavior observed in the heavy-fermion ferromagnet CePd_{1-x}Rh_x near its quantum critical point is universal and can be explained by the fermion condensation quantum phase transition (FCQPT) theory.

Contribution

It introduces a universal explanation for NFL behavior in heavy-fermion metals based on FCQPT, unifying diverse experimental observations.

Findings

NFL behavior in CePd_{1-x}Rh_x is universal across different HF metals.

NFL behavior is linked to a single quantum critical point related to FCQPT.

The theory explains NFL phenomena without dependence on specific alloy details.

Abstract

The heavy-fermion metal CePd_{1-x}Rh_x evolves from ferromagnetism at x=0 to a non-magnetic state at some critical concentration x_c. Utilizing the quasiparticle picture and the concept of fermion condensation quantum phase transition (FCQPT), we address the question about non-Fermi liquid (NFL) behavior of ferromagnet CePd_{1-x}Rh_x and show that it coincides with that of both antiferromagnet YbRh_2(Si_{0.95}Ge_{0.05})_2 and paramagnet CeRu_2Si_2 and CeNi_2Ge_2. We conclude that the NFL behavior being independent of the peculiarities of specific alloy, is universal, while numerous quantum critical points assumed to be responsible for the NFL behavior of different HF metals can be well reduced to the only quantum critical point related to FCQPT.