EPR Spectroscopy of Impurity Thulium Ions in Yttrium Orthosilicate Single Crystals

Abstract

The frequency-field and orientation dependences of the electron paramagnetic resonance (EPR) spectra are measured for impurity Tm3+ ions in yttrium orthosilicate (Y2SiO5) single crystals by stationary EPR spectroscopy in the frequency range of 50–100 GHz at 4.2 K. The position of the impurity ion in the crystal lattice and its magnetic characteristics are determined. The temperature dependences of the spin–lattice and phase relaxation times are measured by pulse EPR methods in the temperature range of 5–15 K and the high efficiency of the direct single-phonon mechanism of spin–lattice relaxation is established. This greatly shortens the spin–lattice relaxation time at low temperatures and makes impurity Tm3+ ions in Y2SiO5 a promising basis for the implementation of high-speed quantum memory based on rare-earth ions in dielectric crystals.