Real-space density-matrix renormalization-group study of the Kondo necklace

S. Moukouri, L. G. Caron, C. Bourbonnais, and L. Hubert
Phys. Rev. B 51, 15920 – Published 1 June 1995
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Abstract

A recently proposed density-matrix renormalization group is used to investigate the ground-state properties of the Kondo-necklace Hamiltonian. It represents a chain of XY interacting pseudospins that are Kondo coupled (J) to localized spins. The spin gap as well as the short- and long-range spin correlation functions are consistent with the existence of a smooth crossover at J≊0.5. For J≤0.5, the gap depends exponentially on J1/2 and the in-plane correlation function of the localized spins shows RKKY oscillations while the z one falls monotonically in contrast to the XY behavior. The correlation length diverges at J=0. For J≥0.5, the gap is linearly increasing with J, and the system is made of nearly independent singlets.

  • Received 28 November 1994

DOI:https://doi.org/10.1103/PhysRevB.51.15920

©1995 American Physical Society

Authors & Affiliations

S. Moukouri, L. G. Caron, C. Bourbonnais, and L. Hubert

  • Centre de Recherche en Physique du Solide, Département de Physique, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1

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Issue

Vol. 51, Iss. 22 — 1 June 1995

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