Heavy fermion behavior in the quasi-one-dimensional Kondo lattice CeCo2Ga8

Abstract

Dimensionality plays an essential role in determining the anomalous non-Fermi liquid properties in heavy fermion systems. So far most heavy fermion compounds are quasi-two-dimensional or three-dimensional. Here we report the synthesis and systematic investigations of the single crystals of the quasi-one-dimensional Kondo lattice CeCo${}_2$Ga${}_8$. Resistivity measurements at ambient pressure reveal the onset of coherence at $T^{\ast }\approx 20$K and non-Fermi liquid behavior with linear temperature dependence over a decade in temperature from 2 K to 0.1 K. The specific heat increases logarithmically with lowering temperature between 10 K and 2 K and reaches 800 mJ/mol K${}^2$ at 1 K, suggesting that CeCo${}_2$Ga${}_8$ is a heavy fermion compound in the close vicinity of a quantum critical point. Resistivity measurements under pressure further confirm the non-Fermi liquid behavior in a large temperature-pressure range. The magnetic susceptibility is found to follow the typical behavior for a one-dimensional (1D) spin chain from 300 K down to $T^{\ast }$, and first-principles calculations predict flat Fermi surfaces for the itinerant $f$-electron bands. These suggest that CeCo${}_2$Ga${}_8$ is a rare example of the quasi-1D Kondo lattice, but its non-Fermi liquid behaviors resemble those of the quasi-two-dimensional YbRh${}_2$Si${}_2$ family. The study of the quasi-one-dimensional CeCo${}_2$Ga${}_8$ family may therefore help us to understand the role of dimensionality on heavy fermion physics and quantum criticality.

11 pages, 7 figures, 2 tables

References in corpus (5)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Quantum criticality
• Heavy Fermions and Quantum Phase Transitions
• Two-Fluid Model for Heavy Electron Physics
• Ferromagnetic ordering of minority Ce${}^{3+}$ spins in a quasi-skutterudite Ce${}_3$Os${}_4$Ge${}_{13}$ single crystal

Cited by in corpus (17)

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• Ultrafast Laser Driven Many-Body Dynamics and Kondo Coherence Collapse
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• Synthesis and physical properties of CeRu${}_2$As${}_2$ and CeIr${}_2$As${}_2$
• Abnormal Normal State and Pressure-driven Reentrant Superconductivity in the Heavy $d$-electron Superconductor Rh${}_{17}$S${}_{15}$
• Charge Density Wave in a Doped Kondo Chain
• Neutron-diffraction and linear {Grüneisen} parameter studies of magnetism in NdFe${}_2$Ga${}_8$
• An emerging global picture of heavy fermion physics
• Uniaxial stress effect on the quasi-one-dimensional Kondo lattice CeCo${}_2$Ga${}_8$
• Local Quantum Criticality of a One-Dimensional Kondo Insulator Model
• One-dimensionality signature in optical conductivity of heavy-fermion CeIr${}_3$B${}_2$
• Abnormal planar Hall effect and disentanglement of incoherent and coherent transport in a Kondo lattice
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• Physical properties of $R$Co${}_2$Al${}_8$ ($R=$ La, Ce, Pr, Nd and Sm) single crystals: An emerging structure-type for anisotropic Kondo lattice studies
• Mass enhancement and metal-nonmetal transition driven by d-f hybridization in perovskites La1-xPrxCuO3