Muons and magnets

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Determining the anisotropy and exchange parameters of polycrystalline spin-1 magnets

(2019)

Authors:

William JA Blackmore, Jamie Brambleby, Tom Lancaster, Stewart J Clark, Roger D Johnson, John Singleton, Andrew Ozarowski, John A Schlueter, Yu-Shen Cheng, Atta M Arif, Saul Lapidus, Fan Xiao, Robert C Williams, Stephen J Blundell, Matthew J Pearce, Martin R Lees, Pascal Manuel, Danielle Y Villa, Jacqueline A Villa, Jamie L Manson, Paul A Goddard
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FeTi$_2$O$_5$: a spin Jahn-Teller transition enhanced by cation substitution

(2019)

Authors:

Franz Lang, Lydia Jowitt, Dharmalingam Prabhakaran, Roger D Johnson, Stephen J Blundell
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Evidence for a J(eff)=0 ground state and defect-induced spin glass behavior in the pyrochlore osmate Y2Os2O7

PHYSICAL REVIEW B 99:17 (2019) ARTN 174442

Authors:

NR Davies, CV Topping, H Jacobsen, AJ Princep, FKK Kirschner, MC Rahn, M Bristow, JG Vale, I da Silva, PJ Baker, Ch J Sahle, Y-F Guo, D-Y Yan, Y-G Shi, SJ Blundell, DF McMorrow, AT Boothroyd
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Probing magnetic order and disorder in the one-dimensional molecular spin chains CuF2(pyz) and [Ln(hfac)3(boaDTDA)]n (Ln=Sm, La) using implanted muons

(2019)

Authors:

T Lancaster, BM Huddart, RC Williams, F Xiao, KJA Franke, PJ Baker, FL Pratt, SJ Blundell, JA Schlueter, MB Mills, AC Maahs, KE Preuss
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Local magnetism, magnetic order and spin freezing in the 'nonmetallic metal' FeCrAs

Journal of Physics: Condensed Matter IOP Publishing 31:28 (2019) 285803

Authors:

BM Huddart, MT Birch, FL Pratt, Stephen Blundell, DG Porter, SJ Clark, W Wu, Julian, PD Hatton, T Lancaster

Abstract:

We present the results of x-ray scattering and muon-spin relaxation ([Formula: see text]SR) measurements on the iron-pnictide compound FeCrAs. Polarized non-resonant magnetic x-ray scattering results reveal the 120° periodicity expected from the suggested three-fold symmetric, non-collinear antiferromagnetic structure. [Formula: see text]SR measurements indicate a magnetically ordered phase throughout the bulk of the material below [Formula: see text] K. There are signs of fluctuating magnetism in a narrow range of temperatures above [Formula: see text] involving low-energy excitations, while at temperatures well below [Formula: see text] behaviour characteristic of freezing of dynamics is observed, likely reflecting the effect of disorder in our polycrystalline sample. Using density functional theory we propose a distinct muon stopping site in this compound and assess the degree of distortion induced by the implanted muon.
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