Paramagnetic Relaxation in Some Nickel Tutton Salts and Cupric Nitrate Salt
1972 年 33 巻 1 号 p. 49-61
詳細
1972 年 33 巻 1 号 p. 49-61
The magnetic field and concentration dependences of the paramagnetic spin relaxation in some nickel tutton salts and a cupric nitrate salt are studied by non-resonant type experiment. A modified Hartshorn bridge operating up to 100 kHz was used inside a high field superconducting magnet of the maximum field of 60 kOe.
At temperature region from 4.2 K to 1.5 K, high frequency susceptibilities show that there are several relaxation processes at some special values of magnetic field, of which relaxation times are faster than that of usual spin-lattice relaxation. The observed relaxation phenomena have been successfully explained by various types of multiple spin flip cross relaxation. The cross relaxation phenomena among unlike spins are also observed in the diluted mixed crystals of (Ni–Mn)-, (Ni–Fe)-, and (Ni–Co)- ammonium tutton salts.
Qualitative explanations are given of the anomalous field dependence of the spin-lattice relaxation time of Co(NH4)2· (SO4)2·6H2O from the view point of the cross relaxation process between Co2+ and Ni2+, where Ni2+ ions are present as small amount of impurity.
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