Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 21, Pages 4990-4993Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.4990
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Magnetic ordering and Kondo behavior coexist in three (Ce,Al)-based compounds: CeAl2, Ce3Al, and Ce3Al11. A common feature apparently independent of crystal structures also prevails in terms of the size-induced transition between these two magnetic phenomena. As the particle size is reduced to nanoscale, the specific heat anomaly associated with the magnetic ordering diminishes. Although the Kondo temperature also decreases, the entropy associated with Kondo anomaly exhibits a large increase. This results in an enhancement of the Kondo behavior and an increased coefficient gamma of the linear term in specific heat. For example, in 80 Angstrom CeAl2 the extrapolated r(0) reaches 9000 mJ mol Ce-1 K-2.
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