Abstract
A series of experiments are reported on single crystals of UPd 2Al 3 in the normal state, i.e. above T c . The most striking effects are a large anomaly in the AC susceptibility that occurs at ~240 K. No microscopic evidence of a phase transition has been found by diffraction techniques. We argue, by analogy with a recent paper on CePd 2Al 3, that the anomalies are caused by the defect (either interstitial Al atoms or defects) in the Al layer of the crystal structure. Synchrotron X-ray back-reflection Laue photographs present striking evidence for short-range disorder in the direction parallel to the hexagonal c axis.
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