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Tunable Doniach phase diagram for strongly-correlated nanoclusters

Luo, Y.; Verdozzi, Claudio LU and Kioussis, N (2005) In Physical Review B. Condensed Matter and Materials Physics 71.
Abstract
Exact diagonalization calculations reveal that the energy spacing Delta in the conduction band tunes the interplay between the local Kondo and nonlocal Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions, giving rise to a Doniach phase diagram for a nanocluster with regions of prevailing Kondo or RKKY correlations. The parity of the total number of electrons alters the competition between the Kondo and RKKY correlations. This interplay may be relevant to experimental realizations of small rings or quantum dots with tunable magnetic properties. Below a critical value Vc of the hybridization the susceptibility exhibits a low-T exponential activation behavior determined by the interplay of the spin gap and Delta.
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B. Condensed Matter and Materials Physics
volume
71
publisher
American Physical Society
external identifiers
  • scopus:15444372541
DOI
10.1103/PhysRevB.71.033304
language
English
LU publication?
yes
id
448aa4f8-3eda-44b9-8cb0-ccc855e17534 (old id 921288)
date added to LUP
2008-01-10 17:57:05
date last changed
2017-01-01 08:07:16
@article{448aa4f8-3eda-44b9-8cb0-ccc855e17534,
  abstract     = {Exact diagonalization calculations reveal that the energy spacing Delta in the conduction band tunes the interplay between the local Kondo and nonlocal Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions, giving rise to a Doniach phase diagram for a nanocluster with regions of prevailing Kondo or RKKY correlations. The parity of the total number of electrons alters the competition between the Kondo and RKKY correlations. This interplay may be relevant to experimental realizations of small rings or quantum dots with tunable magnetic properties. Below a critical value Vc of the hybridization the susceptibility exhibits a low-T exponential activation behavior determined by the interplay of the spin gap and Delta.},
  articleno    = {033304},
  author       = {Luo, Y. and Verdozzi, Claudio and Kioussis, N},
  language     = {eng},
  publisher    = {American Physical Society},
  series       = {Physical Review B. Condensed Matter and Materials Physics},
  title        = {Tunable Doniach phase diagram for strongly-correlated nanoclusters},
  url          = {http://dx.doi.org/10.1103/PhysRevB.71.033304},
  volume       = {71},
  year         = {2005},
}