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Schlagwörter:
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Zusammenfassung:
Analysis of the leading nonlinear term of the susceptibility chi3(T) of
the singlet-ground-state heavy-fermion superconductor UPd2Al3 shows
evidence for a jump at T(N) and a ''third-order'' Curie-Weiss type
behavior at higher temperatures, inferring quadrupolar or magnetoelastic
interactions. These effects are closely related to quadrupolar
correlations observed in measurements of the nonlinear susceptibility
and calculated in a crystal-electric-field approach for the
singlet-ground-state systems URu2Si2 and PrNi5.
