PARTICLE-HOLE ASYMMETRY IN THE 2-IMPURITY KONDO MODEL

Citation
Jb. Silva et al., PARTICLE-HOLE ASYMMETRY IN THE 2-IMPURITY KONDO MODEL, Physical review letters, 76(2), 1996, pp. 275-278
Citations number
21
Categorie Soggetti
Physics
Journal title
ISSN journal
00319007
Volume
76
Issue
2
Year of publication
1996
Pages
275 - 278
Database
ISI
SICI code
0031-9007(1996)76:2<275:PAIT2K>2.0.ZU;2-O
Abstract
A modified numerical renormalization-group procedure, preserving the p article-hole asymmetry of the two-impurity Kondo model, calculates the susceptibility, over 13 decades of temperature, and low-temperature s pecific heat. For large ferromagnetic RKKY couplings, a two-stage Kond o effect screens the triplet-correlated moments. For large antiferroma gnetic couplings, the impurities develop singlet correlations and cont ribute Van Vleck terms to the low-temperature properties. For vanishin g particle-hole asymmetry, previously found critical behavior emerges at low temperatures.