Ferromagetic quantum critical point in heavy fermion compound CeRh6Ge4

Due to the low energy scales, the ground state of heavy fermion compounds can be readily tuned by parameters such as pressure, magnetic fields or doping. There have been numerous studies into antiferromagnetic quantum criticality and unconventional superconductivity, which have been revealed a possible role for spin fluctuations in the superconducting pairing [1, 2]. However, ferromagnetism in heavy fermion systems has been less investigated and there is still short of evidence for the presence of ferromagnetic quantum critical point in a pure system [3]. Here we report various measurements of the ferromagnetic compound CeRh₆Ge₄ under pressure, which provide clear evidence for the existence of a ferromagnetic critical point, at which strange metal behavior is also observed [4].

References:
[1] N. D. Mathur et al., Nature 394, 39 (1998).
[2] Z. F. Weng et al., Rep. Prog. Phys. 79, 094503 (2016)
[3] M. Brando et al., Rev. Mod. Phys. 88, 025006 (2016).
[4] B. Shen et al., arXiv: 1907.10470.