Electron spin-lattice relaxation of low-symmetry Ni.sup.2+./sup. centers in LiF

0432326 - FZÚ 2015 RIV US eng J - Článek v odborném periodiku
Azamat, Dmitry - Badalyan, A. G. - Dejneka, Alexandr - Jastrabík, Lubomír - Lančok, Ján
Electron spin-lattice relaxation of low-symmetry Ni²⁺ centers in LiF.
Applied Physics Letters. Roč. 104, č. 25 (2014), "252902-1"-"252902-4". ISSN 0003-6951. E-ISSN 1077-3118
Grant CEP: GA MŠMT(CZ) LM2011029; GA TA ČR TA01010517; GA ČR GAP108/12/1941
Grant ostatní: SAFMAT(XE) CZ.2.16/3.1.00/22132
Institucionální podpora: RVO:68378271
Klíčová slova: Ni²⁺ centers * LiF single crystals * electron spin-lattice relaxation * electron spin echo technique
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 3.302, rok: 2014

The spin-lattice relaxation times of charge-compensated Ni2+ centers in LiF single crystals were measured using the electron spin echo technique. An analysis of the results revealed a very high relaxation rate with a linear dependence on temperature within the intermediate temperature range of 5–15 K. This acceleration of the relaxation rate was found to be due to the inhomogeneous distribution of Ni2+ ions in the LiF lattice. It seems that the effective cross-relaxation mechanism through the exchange-coupled clusters of Ni2+ ions can play a dominant role. Two-phonon Raman type relaxation dominates at higher temperatures involving the Debye phonon spectrum of the LiF lattice.
Trvalý link: http://hdl.handle.net/11104/0236726