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Updated: Feb 7, 2026

Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance
Published on: September 5, 2018
Sr2Pt8- As: a layered incommensurately modulated metal with saturated resistivity
Edoardo Martino1,2, Alla Arakcheeva1, Gabriel Autès3
1Laboratory of Physics of Complex Matter, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland.
Abstract:
The high-pressure synthesis and incommensurately modulated structure are reported for the new compound Sr2Pt8- 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 concentration of Pt vacancies, incommensurately ordered, strongly influences the electronic conduction properties. This result extends the range of validity of the Mooij correlation to long-range ordered incommensurately modulated vacancies. Motivated by the layered structure, the resistivity anisotropy was measured in a focused-ion-beam micro-fabricated well oriented single crystal. A low resistivity anisotropy indicates that the layers are electrically coupled and conduction channels along different directions are intermixed.
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