Flux-periodicity crossover from h/2e to h/e in aluminium nano-loops

C. Espy, O. J. Sharon, J. Braun, R. Garreis, F. Strigl, A. Shaulov, P. Leiderer, E. Scheer, Y. Yeshurun

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations

Abstract

We study the magnetoresistance of aluminium 'double-networks' formed by connecting the vertexes of nano-loops with relatively long wires, creating two interlaced subnetworks of small and large loops (SL and LL, respectively). Far below the critical temperature, Aharonov-Bohm like quantum interference effects are observed for both the LL and the SL subnetworks. When approaching T c, both exhibit the usual Little-Parks oscillations, with periodicity of the superconducting flux quantum Φ 0 =h/2e. For one sample, with a relatively large coherence length, ξ, at temperatures very close to T c, the Φ 0 periodicity of the SL disappears, and the waveform of the first period is consistent with that predicted recently for loops with a size a < ξ, indicating a crossover to 2Φ 0 periodicity.

Original languageEnglish
Article number012063
JournalJournal of Physics: Conference Series
Volume969
Issue number1
DOIs
StatePublished - 19 Apr 2018
Event28th International Conference on Low Temperature Physics, LT 2018 - Gothenburg, Sweden
Duration: 9 Aug 201716 Aug 2017

Bibliographical note

Publisher Copyright:
© Published under licence by IOP Publishing Ltd.

Funding

This research was supported by a Grant from the GIF, the German-Israeli Foundation for Scientific Research and Development. We thank Arno Kampf, Thilo Kopp, Jochen Mannhart, and Christoph Strunk for insightful discussion and Simon Haus for his help in sample preparation.

FundersFunder number
German-Israeli Foundation for Scientific Research and Development

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