X-ray and neutron scattering

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Neutron scattering study of the orientational disorder in potassium cyanide

Journal of Physics Communications IOP Publishing 4:2 (2020) 023001

Authors:

Guanqun Cai, Anthony E Phillips, David A Keen, Matthew G Tucker, Martin T Dove

Ground state magnetic structure of Mn$_3$Ge

(2020)

Authors:

J-R Soh, F de Juan, N Qureshi, H Jacobsen, H-Y Wang, Y-F Guo, AT Boothroyd

Proton transfer and drug binding details revealed in neutron diffraction studies of wild-type and drug resistant HIV-1 protease

Chapter in Neutron Crystallography in Structural Biology, Elsevier 634 (2020) 257-279

Authors:

Andrey Kovalevsky, Oksana Gerlits, Kaira Beltran, Kevin L Weiss, David A Keen, Matthew P Blakeley, John M Louis, Irene T Weber

Approaching the quantum critical point in a highly-correlated all-in-all-out antiferromagnet

(2019)

Authors:

Yishu Wang, TF Rosenbaum, D Prabhakaran, AT Boothroyd, Yejun Feng

An ideal Weyl semimetal induced by magnetic exchange

Physical Review B: Condensed Matter and Materials Physics American Physical Society (2019)

Authors:

J-R Soh, FD Juan, Vergniory, NBM Schr枚ter, MC Rahn, DY Yan, M Bristow, PA Reiss, JN Blandy, YF Guo, YG Shi, TK Kim, A McCollam, SH Simon, Y Chen, AMALIA Coldea, AT Boothroyd

Abstract:

Weyl semimetals exhibit exceptional quantum electronic transport due to the presence of topologically-protected band crossings called Weyl nodes. The nodes come in pairs with opposite chirality, but their number and location in momentum space is otherwise material specific. Following the initial discoveries there is now a need for better material realizations, ideally comprising a single pair of Weyl nodes located at or very close to the Fermi level and in an energy window free from other overlapping bands. Here we propose the layered intermetallic EuCd$_2$As$_2$ to be such a system. We show that Weyl nodes in EuCd$_2$As$_2$ are magnetically-induced via exchange coupling, emerging when the Eu spins are aligned by a small external magnetic field. The identification of EuCd$_2$As$_2$ as a model magnetic Weyl semimetal, evidenced here by ab initio calculations, photoemission spectroscopy, quantum oscillations and anomalous Hall transport measurements, opens the door to fundamental tests of Weyl physics.