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Cascading transitions toward unconventional charge density wave states in the quasi-two-dimensional monophosphate tungsten bronze P 4W 16O 56

Authors
  • Duverger-Nédellec, Elen1
  • Pautrat, Alain1
  • Kolincio, Kamil K.2
  • Hervé, Laurence1
  • Pérez, Olivier1
  • 1 CRISMAT, ENSICAEN/CNRS UMR6508, France , (France)
  • 2 Gdansk University of Technology, Poland , (Poland)
Type
Published Article
Journal
IUCrJ
Publisher
International Union of Crystallography
Publication Date
Jan 16, 2020
Volume
7
Issue
Pt 2
Pages
184–192
Identifiers
DOI: 10.1107/S2052252519016695
PMID: 32148847
PMCID: PMC7055383
Source
PubMed Central
Keywords
License
Green
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Abstract

Single crystals of the m = 8 member of the low-dimensional monophosphate tungsten bronzes (PO2)4(WO3)2 m 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 T C1 = 258 K, T C2 = 245 K and T C3 = 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 T C1, T C2 and T C3. 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.

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