Abstract

63Cu quadrupole-split nuclear magnetic resonance has been observed in the unconventional Kondo alloy UCu 3.5Pd 1.5. The magnetic and quadrupolar line widths were measured as functions of temperature. Below ∼ 30 K the magnetic line width is enhanced ∼ 25% over the values expected by scaling the high-temperature magnetic susceptibility. This behavior might indicate the possibility of U-spin freezing, as observed in some dilute Kondo alloys. The absence of any anomaly at ∼ 30 K in either the specific heat or the susceptibility suggests, however, that spin freezing does not account for the observations, and that the enhancement is related to intrinsic behavior of the paramagnetic alloy.

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