Specific heat of Ce0.8La0.2Al3 in magnetic fields: a test of the anisotropic Kondo picture.
The specific heat C of Ce0.8La0.2Al3 has been measured as a function of temperature T in magnetic fields up to 14 T. A large peak in C at 2.3 K has recently been ascribed to an anisotropic Kondo effect in this compound. A 14-T field depresses the temperature of the peak by only 0.2 K, but strongly reduces its height. The corresponding peak in C/T shifts from 2.1 K at zero field to 1.7 K at 14 T. The extrapolated specific heat coefficient gamma = lim as T --> 0 of C/T increases with field over the range studied. We show that these trends are inconsistent with the anisotropic Kondo model.
Pietri
R
R
Department of Physics, University of Florida, P.O. Box 118440, Gainesville, Florida 32611-8440, USA.
Ingersent
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K
Andraka
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B