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h / e oscillations in interlayer transport of delafossites

Abstract : Microstructures can be carefully designed to reveal the quantum phase of the wave-like nature of electrons in a metal. Here, we report phase-coherent oscillations of out-of-plane magnetoresistance in the layered delafossites PdCoO2 and PtCoO2 The oscillation period is equivalent to that determined by the magnetic flux quantum, h/e, threading an area defined by the atomic interlayer separation and the sample width, where h is Planck's constant and e is the charge of an electron. The phase of the electron wave function appears robust over length scales exceeding 10 micrometers and persisting up to temperatures of T > 50 kelvin. We show that the experimental signal stems from a periodic field modulation of the out-of-plane hopping. These results demonstrate extraordinary single-particle quantum coherence lengths in delafossites.
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Contributor : Marianne Leriche Connect in order to contact the contributor
Submitted on : Friday, November 27, 2020 - 4:58:38 PM
Last modification on : Tuesday, May 10, 2022 - 3:21:10 AM

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Carsten Putzke, Maja Bachmann, Philippa Mcguinness, Elina Zhakina, Veronika Sunko, et al.. h / e oscillations in interlayer transport of delafossites. Science, 2020, 368 (6496), pp.1234-1238. ⟨10.1126/science.aay8413⟩. ⟨cea-03028713⟩



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