4C6 - Concentration and temperature dependences of spin-lattice relaxation times in ruby at helium temperatures: Relaxation in a zero magnetic field

Author

Manenkov, A.A. ; Danileiko, Yu K.

Author_Institution

Lebedev Physical Institute, Moscow, USSR

Volume

2

Issue

9

fYear

1966

fDate

9/1/1966 12:00:00 AM

Firstpage

409

Lastpage

412

Abstract

The relaxation times T1for the grouud state levels in ruby were measured in the temperature range 4.2 to 1.6°K for the various concentrations of the $Cr^{3+}$ ions $f$ from 0.05 to 0.7 percent. The dependence $T_{1}(f)$ of the form $T_{1}^{-1}(f) = T_{1}^{-1}(0) + T_{1}^{-1}(I)f ^{n}$ with $n \\simeq 2$ has been obtained for the different transitions. The measurements of relaxation times for $\\pm frac{1}{2} \\leftrightarrow \\pm frac{3}{2}$ transition at zero magnetic field were especially aimed at establishing a form of dependence $T_{1}(f)$ because of the absence of the cross relaxation effects in this case. The normal temperature dependence $T_{1} \\propto T_{1}^{-1}$ has been obtained at all concentrations in comparison with anomalous dependences observed at high concentrations by some researchers.

Keywords

Chromium; Electromagnetic wave absorption; Helium; Land surface temperature; Magnetic field measurement; Magnetic fields; Paramagnetic resonance; Temperature dependence; Temperature distribution; Temperature measurement;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/JQE.1966.1074075

Filename

1074075