Disordered Kondo nanoclusters: Effect of energy spacing
نویسنده
چکیده
Exact-diagonalization results for Kondo nanoclusters alloyed with mixed-valence impurities show that tuning the energy spacing D drives the system from the Kondo to the Ruderman-Kittel-Kasuya-Yosida (RKKY) regime. The interplay of D and disorder gives rise to a D versus concentration T=0 phase diagram very rich in structure. The parity of the total number of electrons alters the competition between the Kondo and RKKY correlations. The local Kondo temperatures TK and RKKY interactions depend strongly on the local environment and overall are enhanced by disorder, in contrast to the hypothesis of “Kondo disorder” single-impurity models.
منابع مشابه
Tuning the Magnetism of Ordered and Disordered Strongly-correlated Electron Nanoclusters
Recently, there has been a resurgence of intense experimental and theoretical interest on the Kondo physics of nanoscopic and mesoscopic systems due to the possibility of making experiments in extremely small samples. We have carried out exact diagonalization calculations to study the effect of energy spacing ∆ in the conduction band states, hybridization, number of electrons, and disorder on t...
متن کاملTunable “Doniach Phase Diagram” for strongly-correlated nanoclusters
Exact diagonalization calculations reveal that the energy spacing ∆ in the conduction band tunes the interplay between the local Kondo and non local 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 in...
متن کاملParity-dependent Kondo effect in ultrasmall metallic grains
– In this Letter we study the Kondo effect in an ultrasmall metallic grain, i.e. small enough to have a discrete energy-level spectrum, by calculating the susceptibility χ of the magnetic impurity. Our quantum Monte Carlo simulations, and analytic solution of a simple model, show that the behavior changes dramatically depending on whether the number of electrons in the grain is even or odd. We ...
متن کاملHOW THE KONDO EFFECT CAN EXIST IN Gd INTERMETALLIC COMPOUNDS
Based on the crystal and magnetic structural properties of some Gd intermetallic compounds, it is shown that with increasing conduction electron concentration, Gd experiences electronic and magnetic instability, and that these behaviors point to the appearance of Kondo Lattice. We suggest that the conduction electrons have gained local character. It is shown that Kondo effect should be observed...
متن کاملComputational study of electronic, spectroscopic and chemical properties of Cun(n=2-8) nanoclusters for CO adsorption
First-principle calculations were carried out to investigate the adsorption of CO over Cun nanoclusters. The structural, spectroscopic and electronic properties like optimized geometries, HOMO (highest occupied molecular orbital) and LUMO (lowest unoccupied molecular orbital) energy levels, binding energy, adsorption energy, vibrational frequency and density of states (DOSs) of the p...
متن کامل