Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 50: SC: Tunneling, Josephson Junctions, SQUIDs 2

TT 50.1: Talk

Thursday, March 17, 2011, 14:00–14:15, HSZ 301

Probing the superconducting state of CeCoIn₅ by quantum interferometry — •Oleksandr Foyevtsov, Fabrizio Porrati, and Michael Huth — Johann Wolfgang Goethe University, Frankfurt am Main, Germany

Josephson junction based structures provide a pathway to investigation of the superconducting state of unconventional superconductors. A superconducting quantum interference device (SQUID) structure was fabricated on micro-crystals of the heavy-fermion superconductor CeCoIn₅. Photo-lithography and ion beam milling/induced deposition were used to prepare the structure on a thin film of CeCoIn₅ grown via molecular beam epitaxy. The interferometer was characterized with regard to the SQUID properties. The unconventional nature of superconducting state in CeCoIn₅, the implications of the normal-state electronic properties, as well as the weak-link characteristics of the SQUID structure itself lead to a wealth of different features in the I(V) and dI/dV(V) characteristics.