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Kondo Hamiltonians with a non-zero ground-state spin

1979; IOP Publishing; Volume: 12; Issue: 6 Linguagem: Inglês

10.1088/0022-3719/12/6/001

1747-3802

D. M. Cragg, P Lloyd,

Topological Materials and Phenomena

A Wilson type of 'renormalisation group' calculation shows that the ground state of an s-d exchange Hamiltonian in which a spin-1 impurity interacts with a single scattering channel antiferromagnetically is not a spin-zero state, but is a ferromagnetic spin-1/2 state. Numerous other related calculations confirm that the ground state of an antiferromagnetic s-d exchange Hamiltonian is not necessarily an S state. It is suggested that a spin-zero ground state only occurs when the number of antiferromagnetically coupled scattering channels equals or exceeds twice the spin of the impurity.