Many-impurity effects in a weakly interacting Kondo system: Comparison of theory with experiment
✍ Scribed by Michael W. Klein; L. Shen; Yeun C. Tsay
- Publisher
- Springer US
- Year
- 1975
- Tongue
- English
- Weight
- 555 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0022-2291
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✦ Synopsis
The theory of the many-impurity Kondo system developed in a previous paper is coupled with a statistical model, using a phenomenological relationship between the magnetic susceptibility Z and the effective Kondo temperature, to obtain the magnetic susceptibility of a very dilute Kondo system well below the single-impurity Kondo temperature. We find that the magnetic susceptibility can be represented as arising from a single-impurity effect proportional to the impurity concentration c, another term proportional to c 2, as well as a much smaller c 3 contribution. The coefficient of the c 2 term in Z has an approximate Curie law behavior at sufficiently low temperatures. The detailed temperature and concentration dependence of Z is in very good quantitative agreement with experiment, and is the first theoretical explanation of the anomalous magnetic susceptibility for Cu-Fe below T K. The modification of the susceptibility arises in the theory from the inhibition of the spin-compensated state by the impurityimpurity interaction. The latter renormalizes the In T term even in the region o] temperature where the system is magnetically completely disordered.