Cascading transitions toward unconventional charge density wave states in the quasi-two-dimensional monophosphate tungsten bronze P4 W16 O56

IUCrJ
Elen Duverger-NédellecOlivier Pérez

Abstract

Single crystals of the m = 8 member of the low-dimensional monophosphate tungsten bronzes (PO2)4(WO3)2m family were grown by chemical vapour transport technique and the high crystalline quality obtained allowed a reinvestigation of the physical and structural properties. Resistivity measurements revealed three anomalies at TC1 = 258 K, TC2 = 245 K and TC3 = 140 K, never observed until now. Parallel X-ray diffraction investigations showed a specific signature associated with three structural transitions, i.e. the appearance of different sets of satellite reflections below TC1, TC2 and TC3. Several harmonics of intense satellite reflections were observed, reflecting the non-sinusoidal nature of the structural modulations and a strong electron-phonon coupling in the material. These transitions could be associated with the formation of three successive unconventional charge density wave states.

References

Jun 15, 1989·Physical Review. B, Condensed Matter·E WangS Vadlamannati
Sep 16, 2000·Physical Review Letters·F Galli van Smaalen S
Sep 28, 2001·Acta Crystallographica. Section B, Structural Science·P RousselP Labbé
Nov 11, 2008·Nature Materials·B SiposE Tutis

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Methods Mentioned

BETA
X-ray
thermal diffraction

Software Mentioned

CrysAlisPro

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