2004/05/27 by Kausik Sengupta, E. V. Sampathkumaran, T. Nakano +17
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Rare-earth and actinide compounds #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.70.064406
PRB, in press
arxiv created 2004/05/27 · openalex publication_date 2004/08/05 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
The results of magnetic susceptibility (\ensuremathχ), electrical resistivity (\ensuremathρ), heat-capacity (C), and thermopower (S) measurements on CeCuAs2, 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\phantom\rule0.3em0exmK. The \ensuremathρ behavior is notable in the sense that (i) the temperature (T)-coefficient of \ensuremathρ is negative in the entire range of measurement (45\phantom\rule0.3em0exmK to 300\phantom\rule0.3em0exK) with large values of \ensuremathρ, while the S behavior is typical of metallic Kondo lattices, and (ii) \ensuremathρ is proportional to T^\ensuremath-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\phantom\rule0.3em0exK exhibits a fall below 2\phantom\rule0.3em0exK. The observed properties of this compound are unusual among Ce systems.