ELECTRON SPIN ECHO STUDIES OF PARAMAGNETIC SYSTEMS
Journal Article
·
· J. Phys. Soc. Japan
OSTI ID:4635862
The temperature dependence of the spin lattice relaxation time T/sub 1/ in Ce/sup 3+/, Nd/sup 3+/, and Pr/sup 3+/ diluted in lanthanu m magnesium nitrate was measured by electron spnn echo techniques at 9,300 Mc from 1.5 to 4.2 deg K. T/sub 1/ in Ce and Nd varies as exp (34/T) and exp (46/T) respectively, in good agreement with the Finn, Orbach, Wolf theory. In Pr, a non-Kramers system, T/sub 1/ varies as T/sup -6.5 plus or minus 0.5/, presumably a Raman process. In all three cases, T/sub 1/ increases less rapidly at the low end of the temperature range where the transition to the direct process relaxation is taking place. The fast pulse apparatus has a resolving time of 5 x 10/sup -8/ sec and was used to measure T/sub 1/ and the phase memory time T/sub 2/ in a wide variety of dilute paramagnets. In Nd and Ce the echo formation can be visualized in analogy with the arguments that Hahn developed for nuclear spin echoes. In Pr where the r-f magnetic field is applied parallel to H/sub o/ and to the c axis of the crystal, the formation of the echo is not clearly understood. (auth)
- Research Organization:
- Lockheed Aircraft Corp., Palo Alto, Calif.
- NSA Number:
- NSA-17-037787
- OSTI ID:
- 4635862
- Journal Information:
- J. Phys. Soc. Japan, Journal Name: J. Phys. Soc. Japan Vol. Vol: 17: Suppl. B-I
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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