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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates

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Magnetic impurity in a triple-component semimetal.

Yu-Li Lee1, Yu-Wen Lee2

  • 1Department of Physics, National Changhua University of Education, Changhua, Taiwan, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|January 12, 2021
PubMed
Summary

We studied magnetic impurities in a unique flat band semimetal system. Unlike Dirac or Weyl semimetals, this system shows distinct impurity responses due to its high density of states at the Fermi level.

Keywords:
Kondo effectmagnetic impuritytriple-component semimetal

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Transition metal silicides (CoSi family) offer a platform for realizing triple-component semimetals with flat bands.
  • Ordinary Dirac and Weyl semimetals exhibit vanishing density of states at the Fermi level, leading to predictable impurity responses.

Purpose of the Study:

  • Investigate the behavior of magnetic impurities in a multiband touching fermion system featuring a flat band.
  • Contrast the impurity response in this system with that of conventional Dirac/Weyl semimetals and Fermi liquids.

Main Methods:

  • Determined the phase diagram using mean-field approximation.
  • Analyzed the Kondo screening in the low-temperature regime via variational wavefunction approach.
  • Calculated impurity magnetic susceptibility and heat capacity.
  • Employed the equation of motion approach for higher temperatures to study impurity site occupation and magnetic susceptibility.

Main Results:

  • The flat band semimetal exhibits a significantly different impurity response compared to Dirac/Weyl semimetals when the chemical potential aligns with the flat band.
  • Kondo screening effects were quantified at low temperatures.
  • Impurity magnetic susceptibility and heat capacity contributions were calculated.

Conclusions:

  • The presence of a flat band fundamentally alters magnetic impurity interactions in semimetal systems.
  • The findings provide insights into the exotic electronic properties of materials like the CoSi family.
  • This research contributes to understanding novel quantum phenomena in condensed matter systems.