Unusual Pressure-Induced Periodic Lattice Distortion in SnSe2

Jianjun Ying, Hari Paudyal, Christoph Heil, Xiao-Jia Chen, Viktor V. Struzhkin, Elena R. Margine

Publikation: Beitrag in einer FachzeitschriftShort communication

Abstract

We performed high-pressure x-ray diffraction (XRD), Raman, and transport measurements combined with first-principles calculations to investigate the behavior of tin diselenide (SnSe2) under compression. The obtained single-crystal XRD data indicate the formation of a (1/3,1/3,0)-type superlattice above 17 GPa. According to our density functional theory results, the pressure-induced transition to the commensurate periodic lattice distortion (PLD) phase is due to the combined effect of strong Fermi surface nesting and electron-phonon coupling at a momentum wave vector q=(1/3,1/3,0). In contrast, similar PLD transitions associated with charge density wave (CDW) orderings in transition metal dichalcogenides (TMDs) do not involve significant Fermi surface nesting. The discovered pressure-induced PLD is quite remarkable, as pressure usually suppresses CDW phases in related materials. Our findings, therefore, provide new playgrounds to study the intricate mechanisms governing the emergence of PLD in TMD-related materials.
Originalspracheenglisch
Aufsatznummer027003
FachzeitschriftPhysical Review Letters
Jahrgang121
DOIs
PublikationsstatusVeröffentlicht - 12 Jul 2018

Fingerprint Untersuchen Sie die Forschungsthemen von „Unusual Pressure-Induced Periodic Lattice Distortion in SnSe2“. Zusammen bilden sie einen einzigartigen Fingerprint.

Dieses zitieren