Relaxation in ruby

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1139/p60-136
AuthorSearch for: 1; Search for: 1
Name affiliation
  1. National Research Council of Canada
FormatText, Article
Journal titleCanadian Journal of Physics
ISSN0008-4204
1208-6045
Volume38
Issue10
Pages1304–1317
Abstract
The relaxation of the (1↔2) and (2↔3) transitions in chrome-doped Al2O3 (0.015%) has been studied at S-band, using a pulsed microwave method, over a range of crystal orientations in the magnetic field at temperatures of 77 deg;K to 50 deg;K, and at 4.2 deg;K and 1.6 deg;K. A T−7 variation of the relaxation time with temperature was found in the liquid nitrogen range. The relaxation time in this temperature range was found to be independent of crystal orientation, and for the (1↔2) transition was 50 microseconds at 77 deg;K. At liquid helium temperatures, harmonic cross relaxation was present over most of the range of the crystal orientation studied and was observed at harmonic-to-signal frequency ratios of 2:1, 3:2, and 1:2. The harmonic cross relaxation times were typically 10 to 100 times shorter than the lattice relaxation times, and were independent of temperature. At non-harmonic points at 4.2 deg;K, the spin–lattice relaxation could be described by one time constant, a value of 300 milliseconds being typical. At harmonic points anomalously long relaxation times as high as 12 seconds were observed.
Publication date
PublisherNational Research Council of Canada. Research Press
NoteThe authors were affiliated with the National Research Council of Canada, Radio and Electrical Engineering Division when they authored this article.
LanguageEnglish
Peer reviewedYes
NPARC number23002953
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