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

A. P. Ramirez·P. Chandra·P. Coleman·Z. Fisk·J. L. Smith·H. R. Ott
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Abstract

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 Γ_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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A. P. Ramirez, P. Chandra, P. Coleman, Z. Fisk, J. L. Smith, H. R. Ott. 1994-05-26. Nonlinear Susceptibility: A Direct Test of the Quadrupolar Kondo Effect in UBe(13). https://doi.org/10.1103/physrevlett.73.3018

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