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Complex spectral evolution in a BCS superconductor, ZrB12.

Sangeeta Thakur1, Deepnarayan Biswas, Nishaina Sahadev

  • 1Department of Condensed Matter Physics and Materials' Science, Tata Institute of Fundamental Research, Colaba, Mumbai - 400 005, India.

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|November 27, 2013
PubMed
Summary
This summary is machine-generated.

We studied the electronic structure of the superconductor ZrB12 using spectroscopy and calculations. Results show deviations from Fermi liquid behavior and suggest a pseudogap above the superconducting transition temperature.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Zirconium dodecaboride (ZrB12) is a complex conventional superconductor.
  • Understanding its electronic structure is key to explaining its superconducting properties.

Purpose of the Study:

  • To investigate the electronic structure of ZrB12.
  • To explore its behavior near the Fermi level and its relationship to superconductivity.

Main Methods:

  • High-resolution photoemission spectroscopy.
  • Ab initio band structure calculations (local density approximation).

Main Results:

  • Experimental spectra align well with theoretical calculations.
  • Energy bands near the Fermi level exhibit t2g symmetry.
  • Deviations from Fermi liquid behavior observed, including a dip above the superconducting transition temperature.
  • Evidence for finite electron pair lifetime and a pseudogap.

Conclusions:

  • ZrB12 exhibits complex electronic behavior near its superconducting transition.
  • The observed phenomena suggest a departure from standard Fermi liquid theory.
  • A pseudogap likely exists above the superconducting transition temperature in ZrB12.