Cd2Re2O7 exhibits a unique structural transition characterized by a loss of the inversion symmetry in a metal. Here, we report on structural and electronic properties for A2Re 2O7 (A=Ca and Pb), and S-substituted Cd2Re 2O7. On the basis of material characteristics, we show that the covalency of particular bonds stabilizes the low-temperature phase without the inversion symmetry. We also observed an incoherent charge transport with a weakly temperature-dependent resistivity on the verge of structural transition. This phenomenon is argued in terms of the polaron formation.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2011 Mar 14|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics