High temperature tetragonal crystal structure of UPt${}_2$Si${}_2$

Abstract

High temperature crystal structure of UPt${}_2$Si${}_2$ determined using single-crystal neutron diffraction at 400 K is reported. It is found that the crystal structure remains of the primitive tetragonal CaBe${}_2$Ge${}_2$ type with the space group P4/$n m m. Anisotropic displacement factors of the Pt atoms at the 2a (3/4 1/4 0) and Si atoms at the 2c (1/4 1/4 z) Wyckoff sites are found to be anomalously large.

5 Figures, 3 Tables