Spin Inelastic Electron Tunneling Spectroscopy on Local Magnetic Moment Embedded in Josephson Junction
arXiv:1410.2844 · doi:10.1209/0295-5075/108/67009
Abstract
Recent experimental conductance measurements performed on paramagnetic molecular adsorbates on a superconducting surface, using superconducting scanning tunneling microscopy techniques, are theoretically investigated. For low temperatures, we demonstrate that tunneling current assisted excitations of the local magnetic moment cannot occur for voltage biases smaller than the superconducting gap of the scanning tunneling microscope. The magnetic moment is only excited for voltages corresponding to the sum of the superconducting gap and the spin excitation energies. In excellent agreement with experiment, we show that pumping into higher excitations give additional current signatures by accumulation of density in the lower ones. Using external magnetic fields, we Zeeman split possible degeneracy and thereby resolve all excitations comprised in the magnetic moment.
arXiv comment6 pages, 4 figures, submitted
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- Theory of spin inelastic tunneling spectroscopy for superconductor-superconductor and superconductor-metal junctions
- Spin Excitations of High Spin Iron(II) in Metal-Organic Chains on Metal and Superconductor