Hyperfine and superhyperfine EPR spectra of Tc(IV) and Re(IV) in tin dioxide single crystals

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Abstract
The electron paramagnetic resonance spectra of Tc(IV) and Re(IV) in tin dioxide have been observed at X‐ and Q‐band frequencies at liquid helium temperature. Both ions with a spin ground state of S=3/2 occupy lattice sites of D2h symmetry. The hyperfine structures show large anisotropies, especially in the case of Re(IV), which can be explained by the large crystal field parameters. The spectra fit with a conventional spin Hamiltonian for orthorhombic symmetry correspond to the electron transition 1/2↔−1/2. The obtained parameters for the c‐axis and the magnetic z‐axis coincident are Besides the hyperfine lines, both systems exhibit a partly resolved superhyperfine structure due to an interaction of the unpaired electrons with adjacent tin nuclei.