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    Far infrared spectroscopy of heavy fermion superconductor CeCoIn5

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    Author
    Ocadlík, Stanislav.
    Keyword
    Fermions.
    Heavy particles (Nuclear physics)
    Superconductors.
    Fourier transform infrared spectroscopy.
    Far infrared lasers.
    
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    URI
    http://hdl.handle.net/10464/1878
    Abstract
    The optical response to far infrared radiation has been measured on a mosaic of heavy fermion CeColnssingle crystals. The superconducting transition temperature of the crystals has been determined by van der Pauw resistivity and ac-susceptibility measurements as Tc = 2.3 K. The optical measurements were taken above and below the transition temperature using a 3He cryostat and step and integrate Martin-Puplett type polarizing interferometer. The absolute reflectance of the heavy fermion CeColns in the superconducting state in range (0, 100)cm-1 was calculated from the measured thermal reflectance, using the normal state data of Singley et al and a low frequency extrapolation for a metallic material in the Hagen-Rubens regime. By means of Kramers-Kronig analysis the absolute reflectance was used to calculate the optical conductivity of the sample. The real part of the calculated complex conductivity 0-(w) ofCeColns indicates a possible opening of an energy gap close to 50 em-I.
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