Abstract
The upper critical field B c2 in UNi 2Al 3 is determined as a function of temperature for B || a and c from ac susceptibility measurements on a single crystal. B c2(0) is estimated at 0.93 (|| a) and 0.76 T (|| c). It is argued that B c2 is dominated by orbital effects. De Haas–van Alphen oscillations with F = 3.29 T and m * = 8.3 ± 0.1 m e ( m e=free electron mass) are observed for B || c. It is shown that the observed orbit most likely involves the magnetic breakdown. The orbit is compared to the UPd 2Al 3 β orbit.
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