Nonlinear Susceptibility: A Direct Test of the Quadrupolar Kondo Effect in UBe(13)

Details Nonlinear Susceptibility: A Direct Test of the Quadrupolar Kondo Effect in UBe(13) Nonlinear Susceptibility: A Direct Test of the Quadrupolar Kondo Effect in UBe(13)

1994-05-25

arxiv.org/abs/cond-mat/9405072v2

Physics

Condensed Matter

(Latex+4figs)

Scientific paper

10.1103/PhysRevLett.73.3018

We present the nonlinear susceptibility as a direct test of the quadrupolar Kondo scenario for heavy fermion behavior, and apply it to the case of cubic crystal-field symmetry. Within a single-ion model we compute the nonlinear susceptibility resulting from low-lying \Gamma_3 (5f^2 and Kramers (5f^3) doublets. We find that nonlinear susceptibility measurements on single-crystal UBe_{13} are inconsistent with a quadrupolar 5f^2 ground-state of the uranium ion; the experimental data indicate that the low-lying magnetic excitations of UBe_{13} are predominantly dipolar in character.

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