Eroms, Jonathan and Weiss, Dieter and Boeck, J and Borghs, S (2001) Magnetotransport properties of periodic Nb-2DEG structures. Physica C 353, p. 131.
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We report on magnetotransport experiments in periodic superconductorsemiconductor structures. The samples consist of a square lattice of niobium filled antidots in a high mobility InAs/AlGaSb heterostructure. The lattice period was varied between a=300 and 1000 nm. To judge the quality of the NbInAs- contacts, planar superconductor semiconductor contacts were included on the same chip and assessed by measuring their currentvoltage characteristics and differential conductivities. On the samples with a high Andreev reflection probability, the four-terminal magnetoresistance of the corresponding antidot arrays show a strong suppression of commensurability peaks. Below the critical temperature of the Nb dots, a sharp minimum at B=0 is observed. The arrays with a=1000 nm show a hysteretic peak, whose position is temperature dependent. Possible explanations for the observed features are the dynamics of electrons and holes in the two dimensional electron gas, induced superconductivity in the InAs channel and flux expulsion and pinning in the niobium dots.
|Institutions:||Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Dieter Weiss|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||25 May 2009 13:21|
|Last Modified:||05 Aug 2009 13:57|