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Electron-nuclear double resonance study of V4+ ions in VO2 crystals

机译：Electron-nuclear double resonance study of V4+ ions in VO2 crystals

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摘要

Electron paramagnetic resonance (EPR) and electron-nuclear double resonance (ENDOR) are used to identify and characterize V4+ ions in a bulk single crystal of vanadium dioxide (VO2). These S = 1/2 defects are observed in the as-grown crystal because an adjacent nonmagnetic M4+ impurity, e.g., a Si4+ ion, has destroyed the normal antiferromagnetic coupling associated with the close pairs of V4+ ions that occur in the low-temperature monoclinic phase of VO2. EPR spectra taken near 5 K with the magnetic field along the 110 and 001 axes show resolved hyperfine patterns due to one V-51 nucleus. ENDOR spectra taken at 5 K with the magnetic field parallel to the 001 axis have large nuclear electric quadrupole splittings as a result of a significant electric field gradientat the V-51 nucleus. Spin-Hamiltonian parameters describing the electron Zeeman, hyperfine, and nuclear electric quadrupole interactions are reported.

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