Journal
NEW JOURNAL OF PHYSICS
Volume 15, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/15/1/013032
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Funding
- German and Austrian Science Funds [FOR 1162, I815-N16]
- MOST 973 Project of China [2011CBA00107, 2011CBA00110]
- National Natural Science Foundation [61071009, 11074284, 61027008]
- Specialized Research Fund for Doctoral Program of Higher Education [20090091110040]
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Complex conductivity of FeSe0.5Te0.5 superconducting films has been investigated using backward-wave-oscillator spectroscopy in the terahertz frequency range. The normal state conductivity corresponds well to the low-frequency limit of a Drude metal. In the superconducting state, the real part of the complex conductivity is not completely suppressed, indicating the existence of a strongly anisotropic gap. Weak features in the conductivity are consistent with the superconducting gap value close to 12 cm(-1)(1.5 meV). The experimental results are discussed within the framework of a two-gap model based on the s(+/-) symmetry of the order parameter.
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