Absence of overscreened Kondo effect in ferromagnetic host

Physics – Condensed Matter – Strongly Correlated Electrons

Scientific paper

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

Scientific paper

10.1103/PhysRevB.62.R759

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.

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