Particle-Hole Asymmetry in the Two-Impurity Kondo Model

J. B. Silva; W. L. C. Lima; W. C. Oliveira; J. L. N. Mello; L. N. Oliveira; J. W. Wilkins

doi:10.1103/PhysRevLett.76.275

Particle-Hole Asymmetry in the Two-Impurity Kondo Model

J. B. Silva, W. L. C. Lima, W. C. Oliveira, J. L. N. Mello, L. N. Oliveira, and J. W. Wilkins

Phys. Rev. Lett. 76, 275 – Published 8 January 1996

Abstract

A modified numerical renormalization-group procedure, preserving the particle-hole asymmetry of the two-impurity Kondo model, calculates the susceptibility, over 13 decades of temperature, and low-temperature specific heat. For large ferromagnetic RKKY couplings, a two-stage Kondo effect screens the triplet-correlated moments. For large antiferromagnetic couplings, the impurities develop singlet correlations and contribute Van Vleck terms to the low-temperature properties. For vanishing particle-hole asymmetry, previously found critical behavior emerges at low temperatures.

Received 11 August 1995

DOI:https://doi.org/10.1103/PhysRevLett.76.275

Authors & Affiliations

J. B. Silva¹, W. L. C. Lima^1,2, W. C. Oliveira¹, J. L. N. Mello¹, L. N. Oliveira^1,2, and J. W. Wilkins²

¹Instituto de Física de São Carlos, Universidade de São Paulo, C.P. 369, 13560-970 São Carlos, São Paulo, Brazil
²Physics Department, The Ohio State University, 174 W. 18th Avenue, Columbus, Ohio 43210