PARAMAGNETIC RESONANCE LINES AT LOW TEMPERATURE
Abstract
A number of paramagnetic resonance line shapes have been analyzed and explained in terms of spin-spin interactions. It is shown that this technique may be an important supplement to other methods of investigating interaction in paramagnetic salts. The advantages of the line moment method at low temperature are: (1) the exchange interaction can be found in sign and magnitude. Possible anisotropy of the exchange can be detected; (2) exchange interaction between unlike neighbors only can be measured; if the total exchange is known from other data, the exchange between like neighbors can be separated out; and (3) the method works best at rather weak interactions where specific heat and susceptibility experiments are difficult to perform with sufficient accuracy. The disadvantages of the method are: (1) a complex cryostat is needed and it is difficult to mount the sample inside the cavity in good heat contact with the He3 reservoir; and (2) spherical samples are needed to avoid demagnetizing effects; however, magnetostatic modes are easily excited in spheres, and this may obscure the true line shape.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 05, 1962
- Accession Number
- AD0295897
Entities
People
- George M. Seidel
- Ivar Svare
Organizations
- Harvard University