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Nuclear relaxation in antiferromagnetic crystals

โœ Scribed by J. Van Kranendonk; M. Bloom

Publisher
Elsevier Science
Year
1956
Weight
881 KB
Volume
22
Category
Article
ISSN
0031-8914

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โœฆ Synopsis

A general theory of the spin-lattice relaxation process of nuclear spins in antiferromagnetic crystals, resulting from the magnetic dipolar interaction between the nuclear spins and the antiferromagnetic spins is developed. A detailed calculation of the relaxation time t I is carried out on the basis of the spin wave approximation for the antiferromagnetic spin system. At not too high temperatures the dominant relaxation processes are the Raman spin wave processes. For negligible anisotropy of the antiferromagnetic spin system, t I varies as I/T s at low temperature (T .~ T~v, where TN is the N~el

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The proton spin relaxation time in the antiferromagnetic single crystal of CuC12. 2H,O Was measured in the temperature region of liquid helium. A strong temperature dependence was found, the relaxation time increasing to a few seconds at 1.2ยฐK. Up to 2.5ยฐK the results can be described in terms of a