Publications by authors named "R F Renzi"
Magnetic topological insulators (TIs) herald a wealth of applications in spin-based technologies, relying on the novel quantum phenomena provided by their topological properties. Particularly promising is the (MnBiTe)(BiTe) layered family of established intrinsic magnetic TIs that can flexibly realize various magnetic orders and topological states. High tunability of this material platform is enabled by manganese-pnictogen intermixing, whose amounts and distribution patterns are controlled by synthetic conditions.
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- Polarons, resulting from strong electron-phonon interactions, and spin-orbit coupling, which occurs in materials with heavy atoms, both significantly affect how charge and spin behave in certain materials, especially in transition metal oxides.
- The study introduces a new compound, BaNaCaOsO, where these two effects, usually considered separate, are found to interact and create "spin-orbital bipolarons."
- As more electrons are added to BaNaCaOsO, it maintains its insulating properties with a stable Mott gap, preventing it from transitioning to a metallic state, even at high levels of electron doping.
Magnetostriction results from the coupling between magnetic and elastic degrees of freedom. Though it is associated with a relatively small energy, we show that it plays an important role in determining the site of an implanted muon, so that the energetically favorable site can switch on crossing a magnetic phase transition. This surprising effect is demonstrated in the cubic rocksalt antiferromagnet MnO which undergoes a magnetostriction-driven rhombohedral distortion at the Néel temperature T_{N}=118 K.
View Article and Find Full Text PDFThe use of -level qudits instead of two-level qubits can largely increase the power of quantum logic for many applications, ranging from quantum simulations to quantum error correction. Magnetic molecules are ideal spin systems to realize these large-dimensional qudits. Indeed, their Hamiltonian can be engineered to an unparalleled extent and can yield a spectrum with many low-energy states.
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- Researchers have discovered a new type of quantum coherence involving muons and quadrupolar nuclei, highlighting its potential as a quantum sensor for local charge environments.
- This phenomenon was observed in vanadium intermetallic compounds, which are important for superconductivity.
- The study shows that muons can effectively sense structural and charge-related properties in materials, even in scenarios where magnetic interactions are not present.*