Anharmonic quantum effects of implanted muonsHotz, Fabian (Avtor) Gomilšek, Matjaž (Avtor) Arh, Tina (Avtor) Hicken, Thomas (Avtor) Umek, Polona (Avtor) Zorko, Andrej (Avtor) Luetkens, Hubertus (Avtor) defectsmagnetic interactionsmagnetization dynamicsspin dynamicsdensity functional theorymuon spin resonanceThe quantum behavior of light particles in solids gives rise to phenomena that cannot be captured by a classical description. We show that muon spin spectroscopy (μSR), when paired with a quantum-mechanical treatment of the implanted muon, becomes a sensitive and direct probe of nuclear quantum effects. By modeling the muon as a spatially extended quantum particle, our approach captures strong anharmonic behavior. We demonstrate this in Zn-barlowite, which serves as a nontrivial test case due to its structurally complex lattice and the presence of both fluorine and hydroxyl groups. Our results establish a route for extracting nuclear quantum signatures from μSR data and open different opportunities for studying light nuclei such as hydrogen and lithium in systems where quantum fluctuations shape structure and function.American Physical Society 20262026-06-19 10:25:46Neznano30306ZDAsl