Anomalous Magnetism of UPT_{3}:

TL;DR

This paper investigates the paradoxical antiferromagnetic behavior of UPt₃, proposing a spin-density wave state with finite oscillation frequency to reconcile neutron scattering and NMR observations.

Contribution

It introduces the concept of a finite-frequency SDW state to explain UPt₃'s anomalous magnetic properties, bridging experimental discrepancies.

Findings

Neutron scattering detects antiferromagnetic order below 5K.

NMR and specific heat do not show transition at T_N.

Preliminary calculations suggest a finite-frequency SDW state.

Abstract

UPt${}_{3}$ exhibits a paradoxical behavior in its antiferromagnetism. Namely, the neutron scattering experiments surely detect the antifferomagnetic ordering below the transition temperature ${\rm T}_{N}\sim 5K$, while no trace of the transition is seen in the NMR experiments and in the specific heat at ${\rm T}_{N}$. For resolution of this paradox, we propose the ``SDW state'' which oscillates with a finite frequency larger than those of the NMR and smaller than those of the neutron scattering. For demonstrating such possibility we seek the divergent point of susceptibility, and offer a preliminary calculation of the frequency dependence of ``magnetization''.