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Physics: Prof. dr. H. Hilgenkamp: Experiments with fractional magnetic flux quanta


19 April 2007 FWN-Building 5111.0080, Nijenborgh 4, 9747 AG, Groningen
Speaker: Physics: Prof. dr. H. Hilgenkamp
Affiliation: University of Twente - TNW
Title: Experiments with fractional magnetic flux quanta
Date: 19-04-2007
Start: 16.00
Location: FWN-Building 5111.0080


An intriguing effect occurs when high-T c and low-T c superconductors are connected with each other in certain geometries. Due to the difference in the symmetry properties of the superconducting states in these materials ( ‘d-wave’ versus ‘s-wave’ symmetry) a spontaneous current starts to flow. This current produces a magnetic flux equal to half of the well know flux-quantum Φ= h/2e.

We use this half-flux quantum effect in hybrid high-T c / low-T c structures for basic studies on the high-T c cuprate superconductors [1] (see figure), as well as for the development of novel electronic devices [2]. In this colloquium I will introduce various experiments in both directions.


[1]: Kirtley et al., Nature Physics 2, 190 (2006).

[2]: Ortlepp et al., Science 312, 1495 (2006).

Last modified:12 September 2014 11.22 a.m.