Magnetisation dynamics in the normal and condensate phases of UPd2Al3 I: Surveys in reciprocal space using neutron inelastic scattering

TL;DR

This study provides a comprehensive neutron scattering analysis of the magnetisation dynamics in UPd2Al3, revealing the complex interplay of antiferromagnetism and superconductivity in its low-temperature state.

Contribution

It offers the first detailed survey of wavevector- and energy-dependent magnetisation dynamics in UPd2Al3, enhancing understanding of its magnetic susceptibility and ground state.

Findings

Robust magnetic susceptibility data across various conditions

Evidence of coexistence of antiferromagnetism and superconductivity

Insights into the low-temperature magnetic ground state

Abstract

This paper, I, presents new results from neutron inelastic scattering experiments on single crystals of UPd2Al3. The focus is on the experimental position whilst the sequel, II, advances theoretical perspectives. We present a detailed and complete characterisation of the wavevector- and energy-dependent magnetisation dynamics in UPd2Al3 as measured by neutron inelastic scattering primarily in the form of extensive surveys in energy-momentum space under a wide range of experimental conditions, and put our observations in context with data that has been previously published by two independent groups. In this way we emphasize the commonality and robust nature of the data which indicate the intricate nature of the dynamic magnetic susceptibility of this material. Our results yield unique insight into the low temperature ground state which exhibits a microscopic coexistence of antiferromagnetism and superconductivity making UPd2Al3 one of the most accessible heavy-fermion superconductors that can be fully characterised by neutron spectroscopy.