Electron spin dynamics of Ce.sup.3+./sup. ions in YAG crystals studied by pulse-EPR and pump-probe Faraday rotation

0477955 - FZÚ 2018 RIV US eng J - Journal Article
Azamat, Dmitry - Belykh, V.V. - Yakovlev, D.R. - Fobbe, F. - Feng, D.H. - Evers, E. - Jastrabík, Lubomír - Dejneka, Alexandr - Bayer, M.
Electron spin dynamics of Ce³⁺ ions in YAG crystals studied by pulse-EPR and pump-probe Faraday rotation.
Physical Review B. Roč. 96, č. 7 (2017), s. 1-10, č. článku 075160. ISSN 2469-9950. E-ISSN 2469-9969
R&D Projects: GA MŠMT LO1409; GA ČR GA16-22092S
Institutional support: RVO:68378271
Keywords : electron spin dynamics * Ce³⁺ ions * YAG crystals * pulse-EPR * Faraday rotation
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.813, year: 2017

The spin relaxation dynamics of Ce3+ ions in heavily cerium-doped YAG crystals is studied using pulse-EPR and time-resolved pump-probe Faraday rotation. Both techniques address the 4f ground state, while pump-probe Faraday rotation also provides access to the excited 5d state. We measure a millisecond spin-lattice relaxation time T1, a microsecond spin coherence time T2, and a ~10 ns inhomogeneous spin dephasing time T*2 for the Ce3+ ground state at low temperatures. The spin-lattice relaxation of Ce3+ ions is due to modified Raman processes involving the optical phonon mode at ~125 cm -1. The relaxation at higher temperature goes through a first excited level of the 2F5/2 term at about hν≈ 228 cm -1. Effects provided by the hyperfine interaction of the Ce3+ with the 27Al nuclei are observed.

Permanent Link: http://hdl.handle.net/11104/0274225