Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 30: Superconductivity - Poster Session
TT 30.47: Poster
Monday, March 31, 2014, 15:00–19:00, P2
Large oscillations of the magnetoresistance in nanopatterned thin aluminum films — Christopher Espy1, •Julian Braun1, Omri Sharon2, Elke Scheer1, and Yosef Yeshurun2 — 1Universität Konstanz, Konstanz, Germany — 2Bar-Ilan University, Ramat Gan, Israel
With their experiments on thin superconducting cylinders Little and Parks demonstrated oscillations of the critical temperature with the flux threading the cylinder [1]. The periodicity of Φ0=h/2e supported the picture of a correlated two-electron state, as predicted by BCS theory. However, theoretical studies predict a h/e periodicity in ring-shaped unconventional superconductors that can arise via various mechanisms, when the ring diameter becomes comparable to the BCS coherence length, ξ0 [2-3].
There is even speculation that this periodicity should be seen in rings made out of aluminum, a conventional s-wave superconductor, with diameters smaller than the coherence length, i.e. in the order of 1 µm [3]. Sochnikov et al. investigated this proposed periodicity in double network patterns of LSCO but didn’t find the predicted periodicity [4]. We show first results of our experiments on such double networks of aluminum nano-rings.
W. A. Little and R. D. Parks, PRL 9, 9 (1962)
V. Vakaryuk, PRL 101, 167002 (2008)
Loder et al., PRB 78, 174526 (2008)
Sochnikov et al., Nat. Nanotech. 5, 516 (2010)