Spin-lattice relaxations of9Beand27Alin single crystalline alexandrite
作者:
Tae Ho Yeom,
Kwan Soo Hong,
Insuk Yu,
Hee Won Shin,
Sung Ho Choh,
期刊:
Journal of Applied Physics
(AIP Available online 1997)
卷期:
Volume 82,
issue 5
页码: 2472-2475
ISSN:0021-8979
年代: 1997
DOI:10.1063/1.365767
出版商: AIP
数据来源: AIP
摘要:
Nuclear spin-lattice relaxations ofBe9andAl27in an alexandrite(BeAl2−xCrxO4,x=0.02) single crystal have been investigated in the temperature range 140 K–400 K. The paramagnetic impurity effect on the relaxation is negligible for both nuclei. The relaxation of theBe9nuclear spins is found single exponential in time when the whole resonance lines are uniformly excited. When only the central resonance line is excited forAl27, the relaxation is well fitted with a linear combination of three exponential functions given by Simmons &etal; [Phys. Rev.127, 1168 (1962)]. Since the spin-lattice relaxation rate is proportional to the square of temperature for both nuclei, the dominant relaxation mechanism in this temperature range can be inferred as the Raman process. ©1997 American Institute of Physics.
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