Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 71, Issue 11, Pages 2598-2600Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.71.2598
Keywords
pyrochlore oxide; X-ray diffraction; phase transition; symmetry breaking
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We report the X-ray study for the pyrochlore oxide Cd2Re2O7. Two symmetry-lowering structural transitions were observed at T-s1 = 200 K and T-s2 = 120 K. The former is of the second order from the ideal cubic pyrochlore structure with space group Fd (3) over barm to a tetragonally distorted structure with i (4) over bar m2, while the latter is of the first order likely changing to another tetragonal space group l4(1)22. We discuss the feature of the lattice deformation.
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