Experimental investigation of the resistivity ρ, susceptibility χ, specific heat Cp, and Hall coefficient RH of the pyrochlore Cd2Re2O7 reveals the presence of a continuous phase transition of uncertain origin with critical temperature T* = 200 K. Electron and X-ray diffraction measurements indicate that a commensurate structural transformation accompanies the changes in the electronic properties, implying that lattice as well as electronic degrees of freedom are involved in the transition. Remarkable scaling relationships between ρ, χ, and Cp are observed, indicating that fluctuations are crucial in the transition regime. Scenarios involving both spin and ionic density fluctuations are considered in the evaluation of the data. Although the observed structural transition suggests that ionic density fluctuations are likely to be important, a scaling relationship between ρ and χ over a wide temperature range suggests that spin fluctuations may be playing a role as well.
@article{arxiv.cond-mat/0108402,
title = {Fluctuation Effects on the Physical Properties of Cd2Re2O7 Near 200 K},
author = {R. Jin and J. He and J. R. Thompson and M. F. Chisholm and B. C. Sales and D. Mandrus},
journal= {arXiv preprint arXiv:cond-mat/0108402},
year = {2016}
}