Bullet pressure-cell design for neutron scattering experiments with horizontal magnetic fields and dilution temperatures

TL;DR

This paper introduces a novel bullet-shaped pressure cell compatible with horizontal magnetic fields, enabling neutron scattering experiments under simultaneous high pressure, high magnetic field, and dilution temperatures, advancing experimental capabilities in quantum materials research.

Contribution

The paper presents an optimized pressure-cell design with a novel shape, compatible with high magnetic fields and dilution temperatures, demonstrated through successful neutron scattering experiments.

Findings

Achieved neutron diffraction at 0.7 GPa, 25.9 T, and 200 mK.

Validated the pressure-cell design with finite-element analysis.

Enabled simultaneous extreme condition measurements for quantum materials.

Abstract

The simultaneous application of high magnetic fields and high pressures for controlling magnetic ground states is important for testing our understanding of many-body quantum theory. However, the implementation for neutron scattering experiments presents a technical challenge. To overcome this challenge we present an optimized pressure-cell design with a novel bullet shape, which is compatible with horizontal-field magnets, in particular the high-field magnet operating at the Helmholtz-Zentrum Berlin. The cell enabled neutron diffraction and spectroscopy measurements with the combination of three extreme conditions: high pressures, high magnetic fields, and dilution temperatures, simultaneously reaching 0.7 GPa, 25.9 T, and 200 mK. Our results demonstrate the utility of informed material choices and the efficiency of finite-element analysis for future pressure-cell designs to be used in combination with magnetic fields and dilution temperatures for neutron scattering purposes.