A5033597758- Advancements in Battery Materials
- ZnO doping and properties
- Crystallography and Radiation Phenomena
- Graphite, nuclear technology, radiation studies
- Nuclear Materials and Properties
- Catalytic Processes in Materials Science
- Nuclear Physics and Applications
- Ion-surface interactions and analysis
- Advanced Memory and Neural Computing
- Hydrogen Storage and Materials
- Advanced Condensed Matter Physics
University of British Columbia
2022-2023
Currently, no known material retains its photoinduced metallic conductivity over a long time while also exhibiting repeatable metal-to-insulator recovery. Here, we demonstrate such highly insulator-to-metal transition in yttrium oxyhydride (YOxHy) epitaxial thin films. The temperature (T) dependence of the electrical resistivity (ρ) films transforms from insulating to state (dρ/dT > 0) under ultraviolet laser illumination. YOxHy film recovers original when heated (125 °C) an Ar atmosphere...
We report on the stability and magnetic state of ion implanted $^{8}\mathrm{Li}$ in single crystals semiconductor ZnO using $\ensuremath{\beta}$-detected nuclear resonance. At ultradilute concentrations, spectra reveal distinct Li sites from 7.6 to 400 K. Ionized shallow donor interstitial is stable across entire temperature range, confirming its ability self-compensate acceptor character (Zn) substitutional counterpart. Above 300 K, spin-lattice relaxation indicates onset correlated local...
We report $\ensuremath{\beta}$-detected nuclear magnetic resonance of ultradilute $^{8}\mathrm{Li}^{+}$ implanted in highly oriented pyrolytic graphite (HOPG). The absence motional narrowing and diffusional spin-lattice relaxation implies ${\mathrm{Li}}^{+}$ is not appreciably mobile up to 400 K, sharp contrast the lithiated stage compounds. However, remarkably fast persists down cryogenic temperatures. Ruling out extrinsic paramagnetic impurities intrinsic ferromagnetism, we conclude due...
We report $\beta$-detected nuclear magnetic resonance of ultra-dilute $^{8}$Li$^{+}$ implanted in highly oriented pyrolytic graphite (HOPG). The absence motional narrowing and diffusional spin-lattice relaxation implies Li$^+$ is not appreciably mobile up to 400 K, sharp contrast the lithiated stage compounds. However, remarkably fast persists down cryogenic temperatures. Ruling out extrinsic paramagnetic impurities intrinsic ferromagnetism, we conclude due centers correlated with...