Far-Infrared Optical Conductivity Gap in SuperconductingMgB2Films

2001/06/18 by R. A. Kaindl, Robert A. Kaindl, M. A. Carnahan +9 · 1 citation
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.88.027003

published as Phys. Rev. Lett. 88, 027003 (2002). · 4 pages, 3 figures

arxiv created 2001/06/18 · openalex publication_date 2001/12/28 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We report the first study of the optical conductivity of MgB2 covering the range of its lowest-energy superconducting gap. Terahertz time-domain spectroscopy is utilized to determine the complex, frequency-dependent conductivity sigma(omega) of thin films. The imaginary part reveals an inductive response 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 2Delta0/k(B)TC approximately 1.9 is well below the weak-coupling value, pointing to complex behavior in this novel superconductor.

Citations

• The complex nature of superconductivity in MgB2 as revealed by the reduced total isotope effect
• Theory of dirty superconductors
• Effect of magnetic and nonmagnetic impurities on highly anisotropic superconductivity
• Evidence for Two Superconducting Energy Gaps inMgB2by Point-Contact Spectroscopy
• Optical measurements of the superconducting gap in MgB 2

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• Anisotropic optical conductivity and two colors ofMgB2