Tunneling and pseudo point-contact spectroscopy on YBa2Cu4O8

The first scanning-tunneling and pseudo point-contact spectroscopy results obtained in as-grown surfaces of YBa2Cu4O8 single crystals are presented. In tunneling regime, the conductance dip observed at low-bias voltages reveals a gapped spectra, whereas in the pseudo point-contact regime zero-bias c...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2007-09, Vol.460-462 (2), p.958-960
Main Authors: FASANO, Y, MAGGIO-APRILE, I, KARPINSKI, J, FISCHER, Ø
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure
Exact sciences and technology
Physics
Properties of type I and type II superconductors
Proximity effects, weak links, tunneling phenomena, and josephson effects, adreev effect, sn and sns junctions
Superconductivity
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Summary:The first scanning-tunneling and pseudo point-contact spectroscopy results obtained in as-grown surfaces of YBa2Cu4O8 single crystals are presented. In tunneling regime, the conductance dip observed at low-bias voltages reveals a gapped spectra, whereas in the pseudo point-contact regime zero-bias conductance peaks are detected. Conductance curves are fitted with a BTK-like model assuming a d-wave density of states and considering the same superconducting gap in both regimes, Delta=(14+/-2)meV. This estimation gives Delta=(2.1+/-0.3)kTc, well within the d-wave BCS value, but in contrast with results obtained for cuprates with an extended pseudogap phase.
ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2007.03.326