The Advanced Photon Source
a U.S. Department of Energy Office of Science User Facility

High-Pressure Interest Group - High Pressure Neutron Scattering at the Spallation Neutron Source

Dr. Bianca Haber, Oak Ridge National Laboratory
Start Date
Start Time
1:00 p.m.

In situ high pressure neutron scattering is very useful for the characterization of materials and their behaviors under extreme conditions. Neutron diffraction can be used to determine elemental stoichiometries and atomic positions of light elements and can also be used to directly determine magnetic structures. Neutron spectroscopy can measure dynamics and can, for example, determine phonon dispersions or phonon density of states. Exploiting these capabilities for in situ high pressure studies has, however, previously been limited in maximum pressures due to large sample volumes required. Recent developments at the Spallation Neutron Source (SNS) aim to overcome these limitations and I will highlight several ongoing developments here.  

Neutron scattering is widely used to probe the phase behavior of quantum materials under ultralow temperature (ULT) conditions down. Combining ULT conditions with high pressure has in the past been mainly limited to the use of piston-cylinder type cells (so-called clamped cells) that are limited to ~2 GPa in pressure. At the SNS we are addressing this pressure limit through coupling a large-volume neutron diamond anvil cell (DAC) equipped with polycrystalline anvils [1] with a dilution refrigerator. Here, I will detail in situ neutron diffraction experiments on Yb2O3 conducted at 6 GPa and 170 mK on SNS’s SNAP high pressure diffractometer.  MORE…

For more information about her work, see:

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