Universal behavior of $\mathrm{CeP}{\mathrm{d}}_{1-\mathrm{x}}\mathrm{R}{\mathrm{h}}_{\mathrm{x}}$ Ferromagnet at Quantum Critical Point

Abstract

The heavy-fermion metal $\mathrm{CeP}{\mathrm{d}}_{1-\mathrm{x}}\mathrm{R}{\mathrm{h}}_{\mathrm{x}}$ can be tuned from ferromagnetism at $x=0$ to non-magnetic state at some critical concentration $x_c$. The non-Fermi liquid behavior (NFL) at $x\simeq x_c$ is recognized by power low dependence of the specific heat $C(T)$ given by the electronic contribution, magnetic susceptibility $\chi (T)$ and volume expansion coefficient $\alpha (T)$ at low temperatures: $C/T\propto \chi (T)\propto \alpha (T)/T\propto 1/\sqrt{T}$. We also demonstrate that the behavior of normalized effective mass $M_N^{\ast }$ observed in $\mathrm{CeP}{\mathrm{d}}_{1-\mathrm{x}}\mathrm{R}{\mathrm{h}}_{\mathrm{x}}$ at $x\simeq 0.8$ agrees with that of $M_N^{\ast }$ observed in paramagnetic $\mathrm{CeR}{\mathrm{u}}_2\mathrm{S}{\mathrm{i}}_2$ and conclude that these alloys exhibit the universal NFL thermodynamic behavior at their quantum critical points. We show that the NFL behavior of $\mathrm{CeP}{\mathrm{d}}_{1-\mathrm{x}}\mathrm{R}{\mathrm{h}}_{\mathrm{x}}$ 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.

arXiv comment5 pages, 3 figures

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Cited by in corpus (1)

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