Single-crystal structure determination of (Formula presented) has been performed at 110 and 190 K in order to investigate the possible existence of a local structural deformation proposed by positron annihilation study of Nagai et al. [Phys. Rev. B 57, 14 119 (1998)]. A large thermal contraction along the (Formula presented) axis with decreasing temperature is observed, while the displacement of the atoms within the (Formula presented) plane is very small. This implies that the effect observed in the positron annihilation spectroscopies is caused by interactions involving positronium.
|Number of pages||4|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 1998 Jan 1|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics