Far-infrared optical conductivity gap in superconducting MgB2 films

R. A. Kaindl; M. A. Carnahan; J. Orenstein; D. S. Chemla; H. M. Christen; H. Zhai; M. Paranthaman; D. H. Lowndes

doi:10.1103/PhysRevLett.88.027003

Far-infrared optical conductivity gap in superconducting MgB2 films

Superconductivity 2009-11-07 v1

Authors: R. A. Kaindl , M. A. Carnahan , J. Orenstein , D. S. Chemla , H. M. Christen , H. Zhai , M. Paranthaman , D. H. Lowndes

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

We report the first study of the optical conductivity of MgB2 covering the range of its superconducting energy gap. Terahertz time-domain spectroscopy is utilized to determine the complex, frequency-dependent conductivity of thin films. The imaginary part reveals an inductive reponse due to the emergence of the superconducting condensate. The real part exhibits a strong depletion of oscillator strength near 5 meV resulting from the opening of a superconducting energy gap. The gap ratio of 2Delta/kTc = 1.9 is well below the weak-coupling value, pointing to complex behavior in this novel superconductor

Keywords

optical conductivity MgB2 films superconducting gap terahertz spectroscopy energy gap ratio

Cite

@article{arxiv.cond-mat/0106342,
  title  = {Far-infrared optical conductivity gap in superconducting MgB2 films},
  author = {R. A. Kaindl and M. A. Carnahan and J. Orenstein and D. S. Chemla and H. M. Christen and H. Zhai and M. Paranthaman and D. H. Lowndes},
  journal= {arXiv preprint arXiv:cond-mat/0106342},
  year   = {2009}
}

Comments

4 pages, 3 figures

Far-infrared optical conductivity gap in superconducting MgB2 films

Abstract

Keywords

Cite

Comments

Related papers