Absence of overscreened Kondo effect in ferromagnetic host
Jianhui Dai, Yupeng Wang
Abstract
We study the low temperature behavior of a boundary magnetic impurity S'=1/2 in an open ferromagnetic Takhatajian-Babujian spin-S chain. For antiferromagnetic Kondo coupling, it is show via Bethe ansatz solution that the impurity spin is always locked into the critical behavior the bulk. At low temperature, a local composite of spin S-1/2 forms near the impurity site and its contribution to specific heat is of simple power law T1/2. The absence of overscreened Kondo effect is due to the large correlation length of host spins which is divergent near the quantum critical point.
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