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SOLID-STATE PHYSICS. Scalable T² resistivity in a small single-component Fermi surface.

Xiao Lin1, Benoît Fauqué1, Kamran Behnia2

  • 1Laboratoire de Physique et Etude des Matériaux (CNRS/UPMC), Ecole Supérieure de Physique et de Chimie Industrielles, 10 Rue Vauquelin, F-75005 Paris, France.

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This summary is machine-generated.

Electron-electron scattering in strontium titanate (SrTiO3) causes a T(2) electrical resistivity. Researchers tuned carrier concentration to alter this T(2) behavior, revealing gaps in current theories for Fermi liquids.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Electron-electron scattering contributes to electrical resistivity with a quadratic temperature (T) dependence (T^2).
  • In strongly correlated systems, the T^2 resistivity's prefactor (A) correlates with electronic specific heat (γ).

Purpose of the Study:

  • To investigate the T^2 electrical resistivity in metallic strontium titanate (SrTiO3).
  • To explore the influence of carrier concentration and Fermi energy on the T^2 resistivity prefactor (A).
  • To understand the mechanisms behind T^2 resistivity in the single-band dilute limit.

Main Methods:

  • Systematic tuning of carrier concentration in metallic SrTiO3.
  • Electrical resistivity measurements as a function of temperature.
  • Analysis of the T^2 dependence and its prefactor (A).

Main Results:

  • The prefactor (A) of T^2 resistivity was varied by four orders of magnitude in SrTiO3 by adjusting carrier concentration.
  • The T^2 resistivity behavior was observed to persist even in the single-band dilute limit.
  • This persistence occurred without the presence of known mechanisms like distinct electron reservoirs or Umklapp scattering.

Conclusions:

  • The findings demonstrate a significant tunability of electron-electron scattering effects in SrTiO3.
  • The results challenge existing theoretical frameworks for understanding momentum decay via electron-electron interactions in Fermi liquids.
  • A need for new microscopic theories is highlighted to explain these observations.