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

Sengupta Kausik

Sampathkumaran Echur Varadadesikan

Nakano Tomohito

Hedo Masato

Abliz Melike

Fujiwara Naoki

Uwatoko Yoshiya

Rayaprol Sudhindra

Shigetoh Keisuke

Takabatake Toshiro

Doert Thomas

Jemetio Jean Paul Feudjio

Physical Review B - Condensed Matter and Materials Physics

The results of magnetic susceptibility (χ), electrical resistivity (ρ), heat-capacity (C), and thermopower (S) measurements on CeCuAs 2, forming in the 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 ρ behavior is notable in the sense that (i) the temperature (T)-coefficient of ρ is negative in the entire range of measurement (45 mK to 300 K) with large values of ρ, while the S behavior is typical of metallic Kondo lattices, and (ii) ρ 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.

eng

American Physical Society

Copyright (c) 2004 The American Physical Society.

[ISSN] 1098-0121

[DOI] 10.1103/PhysRevB.70.064406

[NCID] AA11187113

[DOI] http://dx.doi.org/10.1103/PhysRevB.67.212504