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Abstract
Exact diagonalization calculations are employed to study the temperature-dependent specific heat and the susceptibility of strongly correlated nanoclusters in the presence of a magnetic field B. The calculations reveal that B and the energy spacing Δ of the conduction electrons tune the interplay between the local Kondo and non-local RKKY interactions. The magnetic field induces transitions spin states. As the size of the cluster is reduced the RKKY interactions become suppressed compared to the Kondo effect and the low-T peak of the specific heat shifts towards lower temperatures, consistent with experiment. Reduction of the size of the nanocluster induces a transition from an antiferromagnetic to ferromagnetic high-spin ground state.
Acknowledgments
The research at California State University Northridge was supported through NSF under Grant Nos DMR-0097187, NASA under grant No. NCC5-513, and the Keck and Parsons Foundations grants. The calculations were performed on the the CSUN Massively Parallel Computer Platform supported through NSF under Grant No. DMR-0011656.