Magnetic, electrical resistivity, heat-capacity and thermopower anomalies in CeCuAs2

Abstract

The results of magnetic susceptibility, electrical resistivity ($\rho$), heat-capacity (C) and thermopower (S) measurements on CeCuAs2, forming in ZrCuSi2-type tetragonal structure, are reported. Our investigations reveal that Ce is trivalent and there is no clear evidence for long range magnetic ordering down to 45 mK. The $\rho$ behavior is notable in the sense that (i) the temperature (T)-coefficient of $\rho$ is negative in the entire range of measurement (45 mK to 300 K) with large values of $\rho$, while S behavior is typical of metallic Kondo lattices, and (ii) $\rho$ is proportional to T-0.6 at low temperatures, without any influence on the exponent by the application of a magnetic field, which does not seem to classify this compound into hither-to-known non-Fermi liquid (NFL) systems. In contrast to the logarithmic increase known for NFL systems, C/T measured down to 0.5 K exhibits a fall below 2 K. The observed properties of this compound are unusual among Ce systems.

PRB, in press

References in corpus (5)

• Field-Induced Quantum Critical Point in CeCoIn5
• Disorder-driven non-Fermi liquid behavior in Kondo alloys
• Localization-induced Griffiths phase of disordered Anderson lattices
• Enhanced electrical resistivity before Néel order in the metals, RCuAs${}_2$ (R= Sm, Gd, Tb and Dy
• Magnetic and transport anomalies in the compounds, RCuAs2 (R= Pr, Nd, Sm, Gd, Tb, Dy, Ho, and Er)

Cited by in corpus (8)

• A novel non-Fermi-liquid state in the iron-pnictide FeCrAs
• Magnetic behavior of EuCu2As2: Delicate balance between antiferromagnetic and ferromagnetic order
• Electrical resistivity and tunneling anomalies in CeCuAs2
• Magnetic structures of rare earth intermetallic compounds RCuAs${}_2$ (R = Pr, Nd, Tb, Dy, Ho, and Yb)
• Giant spectral renormalization and complex hybridization physics in a Kondo lattice system, CeCuSb2
• Singular dynamics and pseudogap formation in the underscreened Kondo impurity and Kondo lattice models
• Layer-resolved electronic behavior in a Kondo lattice system, CeAgAs2
• Anisotropic Physical Properties of the Kondo Semimetal CeCu${}_{1.11}$As${}_2$