Cheng-Tai Kuo, Stanford Synchrotron Radiation Lightsource

Abstract:

Emergent phenomena reported in quantum materials are strongly associated with the interaction between degrees of freedom, such as charge, spin, orbital, and lattice. It is commonly believed that exploring the ground state of degrees of freedom is crucial to understanding the phenomena properly. Resonant soft x-ray scattering (RSXS) has been regarded as a powerful tool to probe such degrees of freedom. When the temperature of a quantum material reaches below its transition temperature, RSXS scrutinizes its ordering and the corresponding intercoupled behavior between the degrees of freedom. However, the world-appreciated RSXS capabilities at x-ray facilities have been struggling to cool below 25K. It leads to a gap in the demands for investigating the ground state. In this sense, we (SSRL) have developed a new RSXS capability to overcome the gap and would like to introduce it to everyone. The new RSXS capability has been installed at BL13-3 of SSRL. The sample temperature is currently controlled by an open-cycled cryostat (FY23; transferring to an LHe-liquefier system) and an aggressive radiation shield system, which can cool down to a sample temperature of around 10K. Also, the sample motion can be controlled by a 6-axis sample manipulator, enabling a full range of ϴ motion and wide flipping (χ from +30° to -30°) as well as azimuthal (φ from +90° to -90°) motions. The three types of detector (photodiode, charged-coupled device (CCD), and transition-edge-sensor (TES) spectrometer) have been equipped for the RSXS experiments. Ultimately, we believe that this newly developed RSXS setup allows us to explore veiled sciences below 20 K.

Poster Session Link: https://gather.town/invite?token=0pEoq7VP

If you have any questions for the presenter, please contact them via email: ctkuo@slac.stanford.edu