Absence of overscreened Kondo effect in ferromagnetic host

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 T^{1/2}. The absence of overscreened Kondo effect is due to the large correlation length of host spins which is divergent near the quantum critical point.

4 pages. to appear in Phys. Rev. B1(R4A)(2000)

References in corpus (2)

• Overscreening of magnetic impurities in $d_{x^2-y^2}$ wave superconductors
• Ghost spins and novel quantum critical behavior in a spin chain with local bond-deformation