Universal behavior of CePd1-xRhx Ferromagnet at Quantum Critical Point
V. R. Shaginyan, K. G. Popov+, S. A. Artamonov
Petersburg Nuclear Physics Institute RAS, 188300 Gatchina, Russia
+Komi Science Center, Ural Division RAS, 167982 Syktyvkar, Russia
PACS: 71.27.+a, 74.20.Fg, 74.25.Jb
Abstract
The heavy-fermion metal CePd1-xRhx can be tuned from
ferromagnetism at x=0 to non-magnetic state at some critical
concentration xc. The non-Fermi liquid behavior (NFL) at
is recognized by power low dependence of the specific
heat C(T) given by the electronic contribution, susceptibility
χ(T) and volume expansion coefficient α(T) at low
temperatures:
. We also
demonstrate that the behavior of normalized effective mass M*N
observed in CePd1-xRhx at
agrees with that
of M*N observed in paramagnetic CeRu2Si2 and conclude
that these alloys exhibit the universal NFL thermodynamic behavior
at their quantum critical points. We show that the NFL behavior of
CePd1-xRhx can be accounted for within frameworks of
quasiparticle picture and fermion condensation quantum phase
transition, while this alloy exhibits a universal thermodynamic NFL
behavior which is independent of the characteristic features of the
given alloy such as its lattice structure, magnetic ground state,
dimension etc.