Neutron Scattering Research on Quantum Materials under Pressure*

Quantum phenomena exhibits often an extreme sensitivity to weak external perturbations (H, E, P). Among these, pressure is unique in that, even in a moderate range – less than 10 GPa, it induces structural changes that correspond to 1000’s of K, while remaining near the electronic ground state. Also, samples subjected to pressure do not suffer from chemical disorder or impurity phases that may arise from of doping. In this context, neutron scattering, able to inspect both lattice and spin degrees of freedom, while not depositing energy on the sample, is uniquely suitable for the study of quantum systems. Modern neutron sources, such as the SNS, are now coupled with custom made pressure devices that are extend the realm of the possible in terms of exploration of quantum systems with neutrons. Faster measurement on smaller samples are possible across extended ranges of P, T. Here we will present the current suite of instrumentation available to research of quantum materials, including new developments in instrumentation and pressure devices. These advances will be illustrated with science examples that benefited from these new capabilities.