Magnetism of Superconducting UPt3

TL;DR

This paper investigates the phase diagram and neutron scattering data of superconducting UPt3 using a two-component order parameter model, proposing antiferromagnetic moments that couple to superconductivity to explain experimental observations.

Contribution

It introduces a model with two antiferromagnetic moments at different temperatures that couple to superconductivity, providing a qualitative explanation for experimental data.

Findings

Identification of two antiferromagnetic moments at T_N and T_m.

Constraints on Ginzburg-Landau free energy coefficients.

Qualitative explanation of neutron scattering data.

Abstract

The phase diagram of superconducting $U\!Pt_{3}$ in pressure-temperature plane, together with the neutron scattering data is studied within a two component superconducting order parameter scenario. In order to give a qualitative explanation to the experimental data a set of two linearly independent antiferromagnetic moments which emerge appropriately at the temperature \mbox{$T_{N}\sim 10\cdot T_{c}$} and \mbox{$T_{m}\sim T_{c}$} and couple to superconductivity is proposed. Several constraints on the fourth order coefficients in the Ginzburg-Landau free energy are obtained.