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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.
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Submitted on : Tuesday, July 16, 2019 - 11:31:16 AM
Last modification on : Tuesday, May 10, 2022 - 10:56:59 AM

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K. Kolincio, O. Perez, S. Hébert, P. Fertey, A. Pautrat. Detailed investigation of the phase transition in Kx P4 W8 O32 and experimental arguments for a charge density wave due to hidden nesting. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2016, 93 (23), pp.235126. ⟨10.1103/PhysRevB.93.235126⟩. ⟨hal-02184736⟩

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