Electron spin-lattice relaxation of low-symmetry Ni{sup 2+} centers in LiF

Journal Article · Mon Jun 23 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4885381· OSTI ID:22303864

Dejneka, A.; Jastrabik, L.; Lančok, J. ^[1]; Badalyan, A. G. ^[2]

---

1. Institute of Physics, ASCR, 182 21 Prague 8 (Czech Republic)
2. Ioffe Physical-Technical Institute, Russian Academy of Sciences, St. Petersburg 194021 (Russian Federation)

The spin-lattice relaxation times of charge-compensated Ni{sup 2+} 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 Ni{sup 2+} ions in the LiF lattice. It seems that the effective cross-relaxation mechanism through the exchange-coupled clusters of Ni{sup 2+} ions can play a dominant role. Two-phonon Raman type relaxation dominates at higher temperatures involving the Debye phonon spectrum of the LiF lattice.

• OSTI ID: 22303864
• Journal Information: Applied Physics Letters, Vol. 104, Issue 25; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACCELERATION
ACOUSTIC ESR
DISTRIBUTION
ELECTRONS
LITHIUM FLUORIDES
MONOCRYSTALS
NICKEL IONS
PHONONS
SPECTRA
SPIN-LATTICE RELAXATION
SYMMETRY
TEMPERATURE RANGE 0000-0013 K