Low Temperature Symmetry of Pyrochlore Oxide Cd2Re2O7
arXiv:cond-mat/0207497 · doi:10.1143/JPSJ.71.2598
Abstract
We report the X-ray study for the pyrochlore oxide Cd2Re2O7. Two symmetry-lowering structural transitions were observed at Ts1=200K and Ts2=120K. The former is of the second order from the ideal cubic pyrochlore structure with space group Fd-3m to a tetragonally distorted structure with I-4m2, while the latter is of the first order likely to another tetragonal space group I4122. We discuss the feature of the lattice deformation.
4 pages, 4 figures