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Giant Nernst effect in the incommensurate charge density wave state of P4W12O44

Kamil K. Kolincio, Ramzy Daou, Olivier Pérez, Laurent Guérin, Pierre Fertey, and Alain Pautrat
Phys. Rev. B 94, 241118(R) – Published 28 December 2016
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    Abstract

    We report the study of Nernst effect in quasi-low-dimensional tungsten bronze P4W12O44 showing a sequence of Peierls instabilities. We demonstrate that both condensation of the electronic carriers in the charge density wave state and the existence of high-mobility electrons and holes originating from the small pockets remaining in the incompletely nested Fermi surface give rise to a Nernst effect of a magnitude similar to that observed in heavy fermion compounds.

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    • Received 1 June 2016

    DOI:https://doi.org/10.1103/PhysRevB.94.241118

    ©2016 American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    Charge density wavesNernst effect
    1. Physical Systems
    2-dimensional systems
    1. Techniques
    Crystal structuresResistivity measurementsX-ray diffraction
    Condensed Matter, Materials & Applied Physics

    Authors & Affiliations

    Kamil K. Kolincio1,2,*, Ramzy Daou1, Olivier Pérez1, Laurent Guérin3, Pierre Fertey4, and Alain Pautrat1

    • 1Laboratoire CRISMAT, UMR 6508 du CNRS et de l'Ensicaen, 6 Bd Marechal Juin, 14050 Caen, France
    • 2Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland
    • 3Institut de Physique de Rennes, UMR UR1-CNRS 6251, Universite de Rennes 1, 35042 Rennes, France
    • 4Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin BP 48, 91192, Gif-sur-Yvette, France

    • *Corresponding author: kkolincio@mif.pg.gda.pl

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    Issue

    Vol. 94, Iss. 24 — 15 December 2016

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    Images

    • Figure 1
      Figure 1

      Region of the (h0l)☆ plane assembled from frames collected at T=140K,T=100K, and T=72K. The diffuse scattering observed for the position a☆2 weakened noticeably above TP1 while satellite reflections appear in irrational position.

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    • Figure 2
      Figure 2

      Region of the (h0l)☆ (left part) and (hk0)☆ (middle part) planes assembled from frames collected at T=45K. The red and green circles show, respectively, satellite reflections associated with q1 and q2; the light blue rectangle correspond to the average unit cell. The right part is a schematic representation of the area blue-dashed circled in the (hk0)☆ plane. Burgundy ellipsoids and red and green circles summarized all the diffraction features visible on the (hk0)☆ plane.

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    • Figure 3
      Figure 3

      (a) Combined Fermi surface (FS) of P4W12O44 from [18]; the dashed blue lines show its decomposition into 3 FS and the q1 and q2 nesting vectors are reported. (b) Projection into the origin reciprocal cell of all the peaks extracted from the experimental x-ray diffraction frames collected at T=72K. The cloud of peaks located on the a☆ edge of the cell requires the q1 vector to be indexed. (c) Projection into the origin reciprocal cell of all the peaks extracted from the experimental x-ray diffraction frames collected at T=45K. The clouds of peaks associated with q1 and q2 are clearly identified. The segments, purple circles, are diffuse scattering and correspond to the diffraction features drawn with burgundy ellipsoids in the right part of Fig. 2.

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    • Figure 4
      Figure 4

      Resistivity as a function of temperature measured with (red color) and without (blue color) magnetic field applied perpendicularly to the (ab) plane. Inset: Magnetoresistance vs temperature measured at B=14T.

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    • Figure 5
      Figure 5

      Field dependence of (a) Nernst (UN) and (b) Seebeck (US) signal components extracted from the experimental data.

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    • Figure 6
      Figure 6

      Nernst coefficient vs temperature for P4W12O44 measured in B=1T (black squares), B=4T (red circles), and B=8.8 T (blue triangles), displayed in two scales: N (upper panel) and ν=NB (lower panel). Inset: Expanded view of the N(T) dependence measured in B=8.8 T.

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