Spinless impurities and Kondo-like behavior in strongly correlated electron systems

Abstract

We investigate magnetic properties induced by a spinless impurity in strongly correlated electron systems, i.e. the Hubbard model in the spatial dimension $D=1,2,$ and 3. For the 1D system exploiting the Bethe ansatz exact solution we find that the spin susceptibility and the local density of states in the vicinity of a spinless impurity show divergent behaviors. The results imply that the induced local moment is not completely quenched at any finite temperatures. On the other hand, the spin lattice relaxation rate obtained by bosonization and boundary conformal field theory satisfies a relation analogous to the Korringa law, $1/T_{1}T\sim {\chi }^2$. In the 2D and 3D systems, the analysis based upon the antiferromagnetically correlated Fermi liquid theory reveals that the antiferromagnetic spin fluctuation developed in the bulk is much suppressed in the vicinity of a spinless impurity, and thus magnetic properties are governed by the induced local moment, which leads to the Korringa law of $1/T_1$.

9pages,1figure, final version accepted for publication in Phys.Rev.B(Jan2001)

References in corpus (4)

• Quantum Impurity in a Nearly Critical Two Dimensional Antiferromagnet
• Spinless impurities in high Tc cuprates: Kondo-like behavior
• Dynamics of the Local Moment Induced by Nonmagnetic Defects in Cuprates
• Edge Logarithmic Corrections probed by Impurity NMR

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• Thermodynamics of impurities in the anisotropic Heisenberg spin-1/2 chain
• Boundary contributions to specific heat and susceptibility in the spin-1/2 XXZ chain
• Boundary susceptibility in the open XXZ-chain
• Interplay of quantum magnetic and potential scattering around Zn or Ni impurity ions in superconducting cuprates
• Kondo Problem and Related One-Dimensional Quantum Systems: Bethe Ansatz Solution and Boundary Conformal Field Theory