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Ambipolar Nernst effect in NbSe2.

Romain Bel1, Kamran Behnia, Helmuth Berger

  • 1Laboratoire de Physique Quantique (CNRS), Ecole Supérieure de Physique et de Chimie Industrielles, 10 Rue de Vauquelin, F-75231 Paris, France.

Physical Review Letters
|August 26, 2003
PubMed
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The Nernst effect in NbSe2 shows a significant quasiparticle signal, distinct from vortex effects. This suggests charge density waves drastically alter electron scattering, offering insights into high-temperature superconductors.

Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • The Nernst effect is a thermoelectric phenomenon sensitive to electronic properties.
  • NbSe2 is a layered transition metal dichalcogenide exhibiting charge density wave (CDW) order.
  • Understanding the Nernst signal in CDW materials is crucial for condensed matter physics.

Purpose of the Study:

  • To investigate the Nernst effect in NbSe2.
  • To elucidate the contribution of quasiparticles and vortices to the Nernst signal.
  • To understand the impact of the charge density wave transition on electronic transport.

Main Methods:

  • Experimental measurement of the Nernst effect in NbSe2.
  • Analysis of Hall and Nernst coefficients across the CDW transition.

Related Experiment Videos

Main Results:

  • A large quasiparticle contribution to the Nernst effect was observed in NbSe2.
  • The Nernst signal magnitude is comparable and has an opposite sign to the vortex signal.
  • A drastic change in electron scattering rate was indicated in the CDW state.

Conclusions:

  • The observed Nernst signal in NbSe2 originates from thermally induced counterflow of electrons and holes.
  • The findings provide new insights into the anomalous Nernst signal in high-temperature cuprates.
  • This study contributes to the ongoing debate regarding the origins of the Nernst effect in correlated electron systems.