skip to main content

SciTech ConnectSciTech Connect

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

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.
Authors:
; ; ;  [1] ;  [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)
Publication Date:
OSTI Identifier:
22303864
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 25; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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