Field-dependent cyclotron mass of CeAl sub 2

We have studied the cyclotron mass of the heavy fermion compound CeAl sub 2 by measuring the de Haas-van Alphen effect in pulsed magnetic fields up to 52 T and at temperatures down to 1.7 K. With the field parallel to [1 1 1] we find two high-frequency extremal orbits with frequencies of 6.40 and 5....

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 1998-07, Vol.259-261, p.1081-1082
Main Authors: Haanappel, E G, Pricopi, L, Demuer, A, Lejay, P
Format: Article
Language:English
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Summary:We have studied the cyclotron mass of the heavy fermion compound CeAl sub 2 by measuring the de Haas-van Alphen effect in pulsed magnetic fields up to 52 T and at temperatures down to 1.7 K. With the field parallel to [1 1 1] we find two high-frequency extremal orbits with frequencies of 6.40 and 5.41 kT. These values are close to those reported in the literature for the same field orientation. We observe a striking field dependence of the cyclotron mass of the 6.40 kT orbit, similar to the mass decrease observed in CeB sub 6 . The cyclotron mass changes from m*/m sub e = (4.4 plus/minus 0.7) at 35 T to m*/m sub e = (2.0 plus/minus 1.1) at 49 T. This should be compared with the value m*/m sub e = (14.7 plus/minus 0.5) reported below 13 T.
ISSN:0921-4526