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VOLUME 45 (1987) | ISSUE 1 | PAGE 28
Heavy fermions as a giant Migdal effect
The interaction with a system of spins of/-atoms which are weakly coupled with each other is responsible for a pronounced dynamic renormalization of the spectrum of conduction electrons at a low temperature. This renormalization is analogous to a Migdal renormalization in an electron-phonon interaction. In a superconducting state, an anomalously large value of the coefficient к arises as a result. In addition, there is a pronounced lowering of the sensitivity of the triplet state to scattering eifects.