Putzke, CarstenBachmann, Maja D.McGuinness, PhilippaZhakina, ElinaSunko, VeronikaKonczykowski, MarcinOka, TakashiMoessner, RoderichStern, AdyKoenig, MarkusKhim, SeunghyunMackenzie, Andrew P.Moll, Philip J. W.2020-07-122020-07-122020-07-122020-06-1210.1126/science.aay8413https://infoscience.epfl.ch/handle/20.500.14299/170023WOS:000544031400030Microstructures 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.Multidisciplinary SciencesScience & Technology - Other Topicsaharonov-bohm oscillationsconductivityinterferencecrystalgrowthpdcoo2text::journal::journal article::research article