Diffuse Scattering from Correlated Electron Systems

TL;DR

This paper reviews how advanced diffuse scattering techniques reveal nanoscale structural inhomogeneities in correlated electron systems, shedding light on their impact on electronic phenomena like superconductivity and charge order.

Contribution

It highlights recent developments in neutron and x-ray diffuse scattering methods and their application to understanding structural correlations in complex electronic materials.

Findings

Diffuse scattering measurements uncover nanoscale inhomogeneities.

Structural fluctuations are linked to electronic properties.

Advanced analysis tools provide new insights into correlated systems.

Abstract

The role of inhomegeneity in determining the properties of correlated electron systems is poorly understood because of the dearth of structural probes of disorder at the nanoscale. Advances in both neutron and x-ray scattering instrumentation now allow comprehensive measurements of diffuse scattering in single crystals over large volumes of reciprocal space, enabling structural correlations to be characterized over a range of length scales from 10~{\AA} to 200~{\AA} or more. When combined with new analysis tools, such as three-dimensional difference pair-distribution functions, these advanced capabilities have produced novel insights into the interplay of structural fluctuations and electronic properties in a broad range of correlated electron materials. This review describes recent investigations that have demonstrated the importance of understanding structural inhomogeneity pertaining to phenomena as diverse as superconductivity, charge-density-wave modulations, metal-insulator transitions, and multipolar interactions.