X-ray and neutron scattering

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Soft-mode anisotropy in the negative thermal expansion material ReO3

Physical Review B American Physical Society (APS) 104:21 (2021) 214102

Authors:

Tobias A Bird, Mark GL Wilkinson, David A Keen, Ronald I Smith, Nicholas C Bristowe, Martin T Dove, Anthony E Phillips, Mark S Senn
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From n- to p‑Type Material: Effect of Metal Ion on Charge Transport in Metal–Organic Materials

ACS Applied Materials & Interfaces American Chemical Society (ACS) 13:44 (2021) 52055-52062

Authors:

Sungwon Yoon, A Alec Talin, Vitalie Stavila, Austin M Mroz, Thomas D Bennett, Yuping He, David A Keen, Christopher H Hendon, Mark D Allendorf, Monica C So
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A model for coupled $4f-3d$ magnetic spectra: a neutron scattering study of the Yb$-$Fe hybridisation in Yb$_3$Fe$_5$O$_{12}$

(2021)

Authors:

Viviane Peçanha-Antonio, Dharmalingam Prabhakaran, Christian Balz, Aleksandra Krajewska, Andrew T Boothroyd
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Structural units of binary vanadate glasses by X-ray and neutron diffraction

Journal of Non-Crystalline Solids Elsevier 572 (2021) 121120

Authors:

U Hoppe, A Ghosh, S Feller, AC Hannon, DA Keen, J Neuefeind
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Magnetic structure of the topological semimetal YbMnSb2

Physical Review B American Physical Society 104:16 (2021) L161103

Authors:

Jian-Rui Soh, Siobhan M Tobin, Hao Su, Ivica Zivkovic, Bachir Ouladdiaf, Anne Stunault, J Alberto Rodríguez-Velamazán, Ketty Beauvois, Yanfeng Guo, Andrew T Boothroyd

Abstract:

The antiferromagnetic (AFM) semimetal YbMnSb2 has recently been identified as a candidate topological material, driven by time-reversal symmetry breaking. Depending on the ordered arrangement of Mn spins below the Néel temperature, TN = 345 K, the electronic bands near the Fermi energy can either have a Dirac node, a Weyl node, or a nodal line. We have investigated the ground state magnetic structure of YbMnSb2 using unpolarized and polarized single crystal neutron diffraction. We find that the Mn moments lie along the c axis of the P4/nmm space group and are arranged in a C-type AFM structure, which implies the existence of gapped Dirac nodes near the Fermi level. The results highlight how different magnetic structures can critically affect the topological nature of fermions in semimetals.
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