The metallic compound NaRh2O4 forms a full range solid solution to the insulating phase CaRh2O4. At a Na concentration of 0.25 moles per formula unit, we found an unexpected contribution to the specific heat at low temperature [K. Yamaura et al. Chem. Mater. 17 (2005) 359]. To address this issue, specific heat and ac and dc magnetic susceptibilities were additionally measured under a variety of conditions for the Na0.25 sample. A new set of data clearly indicate the additional specific heat is magnetic in origin; however, the magnetic entropy is fairly small (~1 % of Schottky term for a simple splitting doublet), and there is no other evidence to suggest that a magnetic phase transition is responsible for the anomalous specific heat.
@article{arxiv.cond-mat/0508032,
title = {Metallic conductivity and a Ca substitution study of NaRh2O4 comprising a double chain system},
author = {K. Yamaura and Q. Huang and M. Moldovan and D. P. Young and X. L. Wang and E. Takayama-Muromachi},
journal= {arXiv preprint arXiv:cond-mat/0508032},
year = {2009}
}
Comments
Accepted for publication in a special issue of Physica B (the proceedings of SCES05)