Signature of frustrated moments in quantum critical CePd${}_{1-x}$Ni${}_x$Al

Abstract

CePdAl with Ce $4f$ moments forming a distorted kagomé network is one of the scarce materials exhibiting Kondo physics and magnetic frustration simultaneously. As a result, antiferromagnetic (AF) order setting in at $T_{\mathrm{N}}=2.7$~K encompasses only two thirds of the Ce moments. We report measurements of the specific heat, $C$, and the magnetic Grüneisen parameter, ${\Gamma }_{\mathrm{mag}}$, on single crystals of CePd${}_{1-x}$Ni${}_x$Al with $x\le 0.16$ at temperatures down to 0.05~K and magnetic fields $B$ up to $8$~T. Field-induced quantum criticality for various concentrations is observed with the critical field decreasing to zero at $x_c\approx 0.15$. Remarkably, two-dimensional (2D) AF quantum criticality of Hertz-Millis-Moriya type arises for $x=0.05$ and $x=0.1$ at the suppression of 3D magnetic order. Furthermore, ${\Gamma }_{\mathrm{mag}}(B)$ shows an additional contribution near $2.5$~T for all concentrations which is ascribed to correlations of the frustrated one third of Ce moments.

5+2 pages with 4+3 figures

References in corpus (10)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Quantum Criticality in Heavy Fermion Metals
• Weak magnetism and non-Fermi liquids near heavy-fermion critical points
• Quasiparticle mass enhancement approaching optimal doping in a high-Tc superconductor
• Frustration and the Kondo effect in heavy fermion materials
• Divergence of the Magnetic Grüneisen Ratio at the Field-Induced Quantum Critical Point in YbRh${}_2$Si${}_2$
• Characteristic signatures of quantum criticality driven by geometrical frustration
• From itinerant to local-moment antiferromagnetism in Kondo lattices: Adiabatic continuity vs. quantum phase transitions
• Anomalous reduction of the Lorenz ratio at the quantum critical point in YbAgGe
• Dimensional crossover in quantum critical metallic magnets

Cited by in corpus (14)

• Entropy evolution in the magnetic phases of partially frustrated CePdAl
• Magnetic behavior of metallic kagome lattices, Tb3Ru4Al12 and Er3Ru4Al12
• Uniaxial stress tuning of geometrical frustration in a Kondo lattice
• Spin-liquid signatures in the quantum critical regime of pressurized CePdAl
• Field evolution of the spin-liquid candidate YbMgGaO${}_4$
• Quantum critical spin-liquid-like behavior in S = 1/2 quasikagome lattice CeRh1-xPdxSn investigated using muon spin relaxation and neutron scattering
• Anisotropic re-entrant spin-glass features in a metallic kagome lattice, Tb3Ru4Al12
• Frustrated Kondo impurity triangle: A simple model of deconfinement
• Neutron diffraction study of a metallic kagome lattice, Tb3Ru4Al12
• Antiferromagnetic ordering and critical behavior induced giant magnetocaloric effect in distorted kagome lattice Gd${}_3$BWO${}_9$
• Evolution of the partially frustrated magnetic order in CePd${}_{1-x}$Ni${}_x$Al
• Observation of field induced anomalous quantum criticality in Ce0.6Y0.4NiGe2 compound
• Few-body precursors of topological frustration
• Magnetic field and pressure tuning of the heavy fermion antiferromagnet CePdIn