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Nonlinear susceptibility measurements in heavy fermion systems

  • Author(s): Chandra, P;
  • Ramirez, AP;
  • Coleman, P;
  • Brück, E;
  • Menovsky, AA;
  • Fisk, Z;
  • Bucher, E
  • et al.
Abstract

We discuss the nonlinear susceptibility (χ3) as a probe of higher-order spin correlations in heavy fermion materials, with particular emphasis on U Ru2Si2 and U Be13. The sharp discontinuity of χ in U Ru2Si2 is contrasted with two other antiferromagnets U2Zn17 and U0.95Th0.05Pt3 with larger moments. Nonlinear magnetic properties of URu2Si2 can be understood simply in terms of Landau-Ginzberg theory for a large hidden, itinerant order parameter. In UBe13 we discuss how χ3 can be used to probe the presence of quadrupolar fluctuations. © 1994.

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