University of Minnesota
School of Physics & Astronomy

Condensed Matter Sack Lunch Seminar

Friday, December 8th 2017
12:20 pm:
Speaker: Zach Anderson, University of Minnesota
Subject: Inelastic neutron scattering measurements of antiferromagnetic excitations in HgBa2CuO4+δ

Unconventional superconductivity and antiferromagnetism often appear close to each other in the phase diagrams of the cuprates and other unconventional superconductors, and it has been proposed that antiferromagnetic (AF) correlations drive the pairing underlying unconventional superconductivity. A quantitative understanding of these correlations is therefore of great importance. We studied AF excitations in the cuprate superconductor HgBa2CuO4+δ (Hg1201) using inelastic neutron scattering. The structural simplicity of Hg1201 makes it an ideal system in which to study the physics of the essential copper-oxygen plane. Our neutron scattering results differ qualitatively from what is seen in other cuprates, suggesting that structural complications in other materials significantly alter the AF excitations.

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