Abstract
We have investigated evolution of transport and low-energy spin fluctuation properties of heavy Fermi liquid compounds YbAuCu 4 and YbPdCu 4 with the application of magnetic field. YbAuCu 4 is found to be driven from the originally antiferromagnetically (AFM) ordered ground state ( T N ∼ 0.8 K ) to a nonmagnetic Fermi liquid (FL) one through the field-tuned quantum critical point (QCP) at H cr ≃ 13 kOe ( T N → 0 ) . In the vicinity of H cr , the electrical resistivity measurement provides evidence for the increase in the inelastic scattering of heavy electrons, and the 63 Cu spin-lattice relaxation rate measurement exhibits the occurrence of AFM spin order instability. Whilst, YbPdCu 4 transforms from the originally ferromagnetically (FM) ordered ground state ( T C ∼ 0.6 K ) into the nonmagnetic FL state, without any intermediate NFL phenomena. This result indicates that the competition of the field-stabilized FM correlation and field-destabilized AFM correlation plays an important role on the field-driven quantum critical phenomena.
Published Version
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