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Two-gap superconductivity in the Fe-1111 superconductor LaFeAsO1−x Fx: A point-contact Andreev-reflection study

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Gonnelli R., Tortello M., Daghero D., Ummarino G., Stepanov V., Kim J.
Open Physics
|
2009
|
vol. 7
|
issue 2
251-256
EN
Point-contact Andreev-reflection (PCAR) experiments were performed in the Fe-1111 layered superconductor LaFeAsO0.9F0.1 with resistive T con ∼ 27 K. The observation of two pairs of peaks in the low-temperature Andreev-reflection spectra clearly indicates the presence of two order parameters. The behavior of the two gaps as a function of temperature, obtained by fitting the conductance curves by means of the generalized two-band Blonder-Tinkham-Klapwijk model, shows some anomalies. A theoretical analysis performed within the two-band Eliashberg theory with a generic electron-boson coupling can reproduce the low-temperature value of the two gaps but generally fails in giving a satisfactory fit of their overall temperature dependence, indicating the rich and complex physics of these newly discovered superconductors.
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