Seminars | Shull Wollan Center

High Pressure Interest Group Seminar - Utilizing neutron diffraction to non-destructively map residual stresses in operating high-pressure sample environments

ABSTRACT:

Neutron diffraction has proven a valuable tool for materials characterization of engineering materials, specifically for the technique’s merits in residual stress mapping. Neutron diffraction allows for non-destructive spatial characterization of residual stresses in engineering materials with deep penetration, as opposed to x-ray diffraction which can only characterize the surface stress state. The HB2B beamline at HFIR has two decades of history mapping residual stresses in a variety of components and materials.

SWC Seminar - Nature of Quantum Spin Liquid in Kagome Heisenberg Antiferromagnet: Dynamics and Entanglement Response

ABSTRACT

Quantum spin liquids (QSL) are materials that do not order magnetically down to the lowest temperatures and host exotic excitations. The S = 1/2 Heisenberg antiferromagnet model on the kagome lattice (KAFM) constitutes one of the most promising platforms for QSL due to its geometric frustration. Experiments on the kagome compound herberthsmithite show that it is a QSL, but its nature remains under debate. 

Emergent Magnetic Anisotropy in the '115' Cerium-based Heavy Fermions

ABSTRACT: Metals containing cerium exhibit a diverse range of fascinating phenomena including heavy fermion behavior, quantum criticality, and novel states of matter such as unconventional superconductivity. The antiferromagnetic system CeIn3, which becomes superconducting under pressure, is a prototypical case of such physics. We have measured the magnetic H-T phase diagram of CeIn3, and show that above 40 T a surprising anisotropy develops.

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