Cu 63,65 NMR and NQR evidence for an unusual spin dynamics in Pr Cu2 below 100 K

Abstract

We report the results of a Cu 63,65 NMR/NQR study probing the intermetallic compound Pr Cu2. The previously claimed onset of magnetic order at 65 K, indicated in a muon spin resonance study, is not confirmed. Based on our data, we discuss different possible reasons for this apparent discrepancy, including a non-negligible influence of the implanted muons on their environment. Competing dipolar and quadrupolar interactions lead to unusual features of the magnetic-ion/conduction-electron system, different from those of common intermetallics exhibiting structural or magnetic instabilities. © 2008 The American Physical Society.