Kondo effect in a quantum critical ferromagnet

Abstract

We study the Heisenberg ferromagnetic spin chain coupled with a boundary impurity. Via Bethe ansatz solution, it is found that (i) for J>0, the impurity spin behaves as a diamagnetic center and is completely screened by 2S bulk spins in the ground state, no matter how large the impurity spin is; (ii) The specific heat of the local composite (impurity plus 2S bulk spins which form bound state with it) shows a simple power law $C_{loc}\sim T^{3/2}$. (iii)For J<0, the impurity is locked into the critical behavior of the bulk. Possible phenomena in higher dimensions are discussed.

6page Revtex, no figure, final version in PRB, Jun 1 issue, 1999

References in corpus (5)

• Renormalization-group study of Anderson and Kondo impurities in gapless Fermi systems
• Exact Results for a Kondo Problem in One Dimensional t-J Model
• Exact solution of the open Heisenberg chain with two impurities
• Overscreening of magnetic impurities in $d_{x^2-y^2}$ wave superconductors
• Hidden Kondo Effect in a Correlated Electron Chain