Quantifying the quantum nature of high spin YSR excitations in transverse magnetic field
arXiv:2406.04931 · doi:10.1126/sciadv.adq0965
Abstract
Excitations of individual and coupled spins on superconductors provide a platform to study quantum spin impurity models as well as a pathway toward realizing topological quantum computing. Here, we characterize, using ultra-low temperature scanning tunneling microscopy/spectroscopy, the Yu-Shiba-Rusinov (YSR) states of individual manganese phthalocyanine molecules with high spin character on the surface of an ultra-thin lead film in variable transverse magnetic field. We observe two types of YSR excitations, depending on the adsorption geometry of the molecule. Using a zero-bandwidth model, we detail the role of the magnetic anisotropy, spin-spin exchange, and Kondo exchange. We illustrate that one molecular type can be treated as an individual spin akin to an isolated spin on the metal center, whereas the other molecular type invokes a coupled spin system represented by a spin on the center and the ligand. Using the field-dependent evolution of the YSR excitations and comparisons to modeling, we describe the quantum phase of each of the molecules. These results provide an insight into the quantum nature of YSR excitations in magnetic field, and a platform to study spin impurity models on superconductors in magnetic field.
References in corpus (18)
- Magnetic anisotropy in Shiba bound states across a quantum phase transition
- Tuning the coupling of an individual magnetic impurity to a superconductor: quantum phase transition and transport
- Observation of Coexistence of Yu-Shiba-Rusinov States and Spin-Flip Excitations
- Tuning emergent magnetism in a Hund's impurity
- Magnetic anisotropy effects on quantum impurities in superconducting host
- Enhanced anti-ferromagnetic exchange between magnetic impurities in a superconducting host
- Quantifying the interplay between fine structure and geometry of an individual molecule on a surface
- Kondo effect and spin quenching in high-spin molecules on metal substrates
- Yu-Shiba-Rusinov states in real metals
- Cotunneling theory of inelastic STM spin spectroscopy
- Interfering tunneling paths through magnetic molecules on superconductors: Asymmetries of Kondo and Yu-Shiba-Rusinov resonances
- Electron and Cooper pair transport across a single magnetic molecule explored with a scanning tunneling microscope
- Design and performance of an ultra-high vacuum spin-polarized scanning tunneling microscope operating at 30 mK and in a vector magnetic field
- Pair excitations of a quantum spin on a proximitized superconductor
- Zeeman effects on Yu-Shiba-Rusinov states
- Tracking a Spin-Polarized Superconducting Bound State across a Quantum Phase Transition
- Quantum spin driven Yu-Shiba-Rusinov multiplets and fermion-parity-preserving phase transition in KC
- Cooper Pair Induced Frustration and Nematicity of Two-Dimensional Magnetic Adatom Lattices