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Journal articles
Detailed investigation of the phase transition in Kx P4 W8 O32 and experimental arguments for a charge density wave due to hidden nesting
Abstract : Detailed structural and magnetotransport properties of monophosphate tungsten bronze Kx(PO2)4(WO3)8 single crystals are reported. Both galvanomagnetic and thermal properties are shown to be consistent with a charge density wave electronic transition due to hidden nesting of the quasi-1D portion of the Fermi surface. We also observe the enhancement of electronic anisotropy due to reconstruction of the Fermi surface at the Peierls transition. The resistivity presents a thermal hysteresis suggesting a first-order nature characteristic of a strong-coupling scenario. However, other measurements such as the change of carrier density demonstrate a second-order Peierls scenario with weak-coupling features. We suggest that the structural transition driven by the residual strain in the K-P-O environment is responsible for the resistivity hysteresis and modifies the Fermi surface which then helps the rise to the second-order Peierls instability. © 2016 American Physical Society.
https://hal-normandie-univ.archives-ouvertes.fr/hal-02184736
Contributor : Université Normandie <>
Submitted on : Tuesday, July 16, 2019 - 11:31:16 AM
Last modification on : Friday, April 24, 2020 - 10:28:08 AM
Contributor : Université Normandie <>
Submitted on : Tuesday, July 16, 2019 - 11:31:16 AM
Last modification on : Friday, April 24, 2020 - 10:28:08 AM
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