Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 40: Poster Session Correlated Electrons
TT 40.45: Poster
Mittwoch, 13. März 2013, 15:00–19:00, Poster D
Superconducting energy gap of the organic charge-transfer salts κ-(ET)2Cu[N(CN)2]Br and κ-(ET)2Cu(NCS)2 studied by point-contact spectroscopy — •Severin Schad, Benedikt Hartmann, and Jens Müller — Physikalisches Institut, Goethe Universität, Frankfurt, Germany
The organic charge transfer salts (BEDT-TTF)2X form crystalline structures with alternating conducting and insulating layers serving as model systems for two-dimensional metals with strong electronic correlations. Different electronic phases are realised for example by varying the anion X. Compounds with X=Cu[N(CN)2]Br and Cu(NCS)2 show metallic behaviour with a superconducting transition at temperatures of 11.5 K and 9.5 K, respectively.
Although intensively studied, both the anomalous normal conducting state and the nature of superconductivity (regarding the order parameter symetry and the mechanism of cooper pairing) remain unresolved [1].
We use the technique of soft point contact spectroscopy for investigating the superconducting gap structure. Meaningful results require the creation of small interfaces between the superconductor and a normal metal in order to obtain dI/dV vs. V curves. The poster will provide information about measurement and various fabrication techniques. Experimental results of both temperature and magnetic-field dependences are presented as well as the discussion of zero-bias conductance curves.
[1] N. Toyota, M. Lang and J. Müller, Low-Dimensional Molecular Metals, Solid State Science, Springer-Verlag Berlin Heidelberg (2007)