Semimetallic Kondo lattice behavior in YbPdAs with a distorted kagome structure

Abstract

We have synthesized YbPdAs with the hexagonal ZrNiAl-type structure, in which the Yb-atoms form a distorted kagome sublattice in the hexagonal basal plane. Magnetic, transport, and thermodynamic measurements indicate that YbPdAs is a low-carrier Kondo lattice compound with an antiferromagnetic transition at $T_{\mathrm{N}}$ = 6.6 K, which is slightly suppressed in applied magnetic fields up to 9 T. The magnetic entropy at $T_{\mathrm{N}}$ recovers only 33\% of $R\ln 2$, the full entropy of the ground state doublet of the Yb-ions. The resistivity displays a $-\ln T$ dependence between 30 and 15 K, followed by a broad maximum at $T{}_{\mathrm{coh}}$ = 12 K upon cooling. Below $T{}_{\mathrm{coh}}$, the magnetoresistance changes from negative to positive, suggesting a crossover from single-ion Kondo scattering processes at intermediate temperatures to coherent Kondo lattice behaviors at low temperatures. Both the Hall resistivity measurements and band structure calculations indicate a relatively low carrier concentration in YbPdAs. Our results suggest that YbPdAs could provide an opportunity for examining the interplay of Kondo physics and magnetic frustration in low carrier systems.

arXiv comment9 pages, 9 figures

References in corpus (22)

• Maximally-localized generalized Wannier functions for composite energy bands
• Anomalous Hall effect
• Fractionalized Fermi liquids
• Review on magnetic and related properties of RTX compounds
• Frustration and the Kondo effect in heavy fermion materials
• Quantum Criticality and Global Phase Diagram of Magnetic Heavy Fermions
• Magnetic Field Induced Non-Fermi-Liquid Behavior in YbAgGe Single Crystal
• Realization of the kagome spin ice state in a frustrated intermetallic compound
• Quantum-critical phase out of frustrated magnetism in a strongly correlated metal
• Characteristic signatures of quantum criticality driven by geometrical frustration
• Entropy evolution in the magnetic phases of partially frustrated CePdAl
• Quantum bicriticality in the heavy-fermion metamagnet YbAgGe
• From itinerant to local-moment antiferromagnetism in Kondo lattices: Adiabatic continuity vs. quantum phase transitions
• Pressure-tuned quantum criticality in the antiferromagnetic Kondo semi-metal CeNi${}_{2-\delta }$As${}_2$
• Quantum Phases of the Shastry-Sutherland Kondo Lattice: Implications for the Global Phase Diagram of Heavy Fermion Metals
• Hall effect in heavy-fermion metals
• Temperature-field phase diagram of geometrically frustrated CePdAl
• CePdAl - a Kondo lattice with partial frustration
• Spin-liquid signatures in the quantum critical regime of pressurized CePdAl
• Anomalous metamagnetism in the low carrier density Kondo lattice YbRh3Si7
• Antiferromagnetic correlations in strongly valence fluctuating CeIrSn
• Extremely large magnetoresistance and compensated Fermi surfaces in the antiferromagnetic semimetal YbAs

Cited by in corpus (5)

• Magnetic properties and spin dynamics in a spin-orbit driven Jeff= 1/2 triangular lattice antiferromagnet
• Kondo screening and coherence in kagome local-moment metals: Energy scales of heavy fermions in the presence of flat bands
• Magnetic properties of a spin-orbit entangled Jeff = 1/2 honeycomb lattice
• Magnetic field and pressure tuning of the heavy fermion antiferromagnet CePdIn
• Enhanced Neel temperature and unusual thermal expansion in flux-grown FeCrAs crystals