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Activation Energy of ⁶⁹Ga, ⁷¹Ga, and ⁷⁵As Nuclei in GaAs:Mn²⁺ Single Crystal

Journal of Magnetics, Volume 19, Number 2, 30 Jun 2014, Pages 116-120

Tae Ho Yeom (Department of Laser and Optical Information Engineering, Cheongju University), Ae Ran Lim *

(Department of Science Education, Jeonju University)

Abstract

The spin–lattice relaxation time, T₁, for ⁶⁹Ga, ⁷¹Ga, and ⁷⁵As nuclei in GaAs:Mn²⁺ single crystals was measured as a function of temperature. The values of T₁ for ⁶⁹Ga, ⁷¹Ga, and ⁷⁵As nuclei were found to decrease with increasing temperature. The T₁ values in GaAs:Mn²⁺ crystal are similar to those in pure GaAs crystal. The calculated activation energies for the ⁶⁹Ga, ⁷¹Ga, and ⁷⁵As nuclei are 4.34, 4.07, and 3.99 kJ/mol. It turns out that the paramagnetic impurity effect of Mn²⁺ ion doped in GaAs single crystal was not strong on the spin-lattice relaxation time.

Keywords: paramagnetic ions; nuclear magnetic resonance (NMR); activation energy; relaxation time

DOI: http://dx.doi.org/10.4283/JMAG.2014.19.2.116

Full Text: PDF

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