Sr₂Pt_8-x As: a layered incommensurately modulated metal with saturated resistivity.

ABSTRACT: The high-pressure synthesis and incommensurately modulated structure are reported for the new compound Sr₂Pt_8-x As, with x = 0.715 (5). The structure consists of Sr₂Pt₃As layers alternating with Pt-only corrugated grids. Ab initio calculations predict a metallic character with a dominant role of the Pt d electrons. The electrical resistivity (ρ) and Seebeck coefficient confirm the metallic character, but surprisingly, ρ showed a near-flat temperature dependence. This observation fits the description of the Mooij correlation for electrical resistivity in disordered metals, originally developed for statistically distributed point defects. The discussed material has a long-range crystallographic order, but the high concen

SUBMITTER: Martino E 

PROVIDER: S-EPMC6038961 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature