Muons and magnets

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Inhomogeneous superconductivity in LuxZr1-xB12 dodecaborides with dynamic charge stripes

(2020)

Authors:

A Azarevich, A Bogach, V Glushkov, S Demishev, A Khoroshilov, K Krasikov, V Voronov, N Shitsevalova, V Filipov, S Gabani, K Flachbart, A Kuznetsov, S Gavrilkin, K Mitsen, SJ Blundell, N Sluchanko
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Magnetic ground-state of the one-dimensional ferromagnetic chain compounds $M$(NCS)$_2$(thiourea)$_2$; $M$ = Ni, Co

(2020)

Authors:

Samuel PM Curley, Rebecca Scatena, Robert C Williams, Paul A Goddard, Piero Macchi, Thomas J Hicken, Tom Lancaster, Fan Xiao, Stephen J Blundell, Vivien Zapf, James C Eckert, Elizabeth H Krenkel, Jacqueline A Villa, Melissa L Rhodehouse, Jamie L Manson
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Position-dependent stability and lifetime of the skyrmion state in nickel-substituted Cu2OSeO3

Physical Review B American Physical Society (APS) 102:22 (2020) 224407

Authors:

M Crisanti, MT Birch, MN Wilson, SH Moody, A Štefančič, BM Huddart, S Cabeza, G Balakrishnan, PD Hatton, R Cubitt
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Megahertz dynamics in skyrmion systems probed with muon-spin relaxation

(2020)

Authors:

TJ Hicken, MN Wilson, KJA Franke, BM Huddart, Z Hawkhead, M Gomilšek, SJ Clark, FL Pratt, A Štefančič, AE Hall, M Ciomaga Hatnean, G Balakrishnan, T Lancaster
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Magnetic order and disorder in a quasi-two-dimensional quantum Heisenberg antiferromagnet with randomized exchange

PHYSICAL REVIEW B 102:17 (2020) ARTN 174429

Authors:

F Xiao, Wja Blackmore, Bm Huddart, M Gomilsek, Tj Hicken, C Baines, Pj Baker, Fl Pratt, Sj Blundell, H Lu, J Singleton, D Gawryluk, Mm Turnbull, Kw Kramer, Pa Goddard, T Lancaster

Abstract:

We present an investigation of the effect of randomizing exchange coupling strengths in the S=1/2 square lattice quasi-two-dimensional quantum Heisenberg antiferromagnet (QHAF) (QuinH)2Cu(ClxBr1-x)4·2H2O (QuinH = Quinolinium, C9H8N+), with 0≤x≤1. Pulsed-field magnetization measurements allow us to estimate an effective in-plane exchange strength J in a regime where exchange fosters short-range order, while the temperature TN at which long-range order (LRO) occurs is found using muon-spin relaxation, allowing us to construct a phase diagram for the series. We evaluate the effectiveness of disorder in suppressing TN and the ordered moment size, and we find an extended disordered phase in the region 0.4≲x≲0.8 where no magnetic order occurs. The observed critical substitution levels are accounted for by an energetics-based competition between different local magnetic orders. Furthermore, we demonstrate experimentally that the ground-state disorder is driven by quantum effects of the exchange randomness, which is a feature that has been predicted theoretically and has implications for other disordered quasi-two-dimensional QHAFs.
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