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pro vyhledávání: '"Johnson, RD"'
Powder neutron-diffraction experiments have been employed to establish the effects of site-selective magnetic dilution in the Sm2MnMnMn4-xTixO12 A-site columnar ordered quadruple perovskite manganites (x=1, x=2, and x=3). We show that in all three co
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https://ora.ox.ac.uk/objects/uuid:9b3c7451-9bbc-4762-aa42-a47a45844a1b
https://ora.ox.ac.uk/objects/uuid:9b3c7451-9bbc-4762-aa42-a47a45844a1b
Using micromagnetic simulations, we have modelled the formation of imprinted merons and anti-merons in cobalt overlayers of different thickness (1-8 nm), stabilised by interfacial exchange with antiferromagnetic vortices in $\alpha$-Fe2O3. Structures
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http://arxiv.org/abs/1912.07511
http://arxiv.org/abs/1912.07511
Autor:
Liu, J, Kittaka, S, Johnson, RD, Lancaster, T, Singleton, J, Sakakibara, T, Kohama, Y, Van Tol, J, Ardavan, A, Williams, BH, Blundell, SJ, Manson, ZE, Manson, JL, Goddard, PA
Publikováno v:
Physical review letters, 2019, Vol.122(5), pp.057207 [Peer Reviewed Journal]
We investigate the low-temperature magnetic properties of the molecule-based chiral spin chain [Cu(pym)(H$_2$O)$_4$]SiF$_6\cdot$H$_2$O (pym = pyrimidine). Electron-spin resonance, magnetometry and heat capacity measurements reveal the presence of sta
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e4c6c157b18a8d4e096dc59c1b5395f5
https://doi.org/10.1103/physrevlett.122.057207
https://doi.org/10.1103/physrevlett.122.057207
Autor:
Huon, A, Vibhakar, AM, Grutter, AJ, Borchers, JA, Disseler, S, Liu, Y, Tian, W, Orlandi, F, Manuel, P, Khalyavin, DD, Sharma, Y, Herklotz, A, Lee, HN, Fitzsimmons, MR, Johnson, RD, May, SJ
Publikováno v:
Physical Review B. 98(22)
Noncollinear magnetism can play an important role in multiferroic materials but is relatively understudied in oxide heterostructures compared to their bulk counterparts. Using variable temperature magnetometry and neutron diffraction, we demonstrate
Publikováno v:
Physical review letters
120 (2018): 257202-1. doi:10.1103/PhysRevLett.120.257202
info:cnr-pdr/source/autori:Johnson, R. D.; Mezzadri, F.; Manuel, P.; Khalyavin, D. D.; Gilioli, E.; Radaelli, P. G./titolo:Evolution of Magneto-Orbital order Upon B-Site Electron Doping in Na1-xCaxMn7O12 Quadruple Perovskite Manganites/doi:10.1103%2FPhysRevLett.120.257202/rivista:Physical review letters (Print)/anno:2018/pagina_da:257202-1/pagina_a:/intervallo_pagine:257202-1/volume:120
120 (2018): 257202-1. doi:10.1103/PhysRevLett.120.257202
info:cnr-pdr/source/autori:Johnson, R. D.; Mezzadri, F.; Manuel, P.; Khalyavin, D. D.; Gilioli, E.; Radaelli, P. G./titolo:Evolution of Magneto-Orbital order Upon B-Site Electron Doping in Na1-xCaxMn7O12 Quadruple Perovskite Manganites/doi:10.1103%2FPhysRevLett.120.257202/rivista:Physical review letters (Print)/anno:2018/pagina_da:257202-1/pagina_a:/intervallo_pagine:257202-1/volume:120
We present the discovery and refinement by neutron powder diffraction of a new magnetic phase in the Na1-xCaxMn7O12 quadruple perovskite phase diagram, which is the incommensurate analogue of the well-known pseudo-CE phase of the simple perovskite ma
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https://ora.ox.ac.uk/objects/uuid:bcd704d9-011d-4279-914d-5ac67be4f0a7
https://ora.ox.ac.uk/objects/uuid:bcd704d9-011d-4279-914d-5ac67be4f0a7
Autor:
Brambleby, J, Manson, JL, Goddard, PA, Stone, MB, Johnson, RD, Manuel, P, Villa, JA, Brown, CM, Lu, H, Chikara, S, Zapf, V, Lapidus, SH, Scatena, R, Macchi, P, Chen, Y-S, Wu, L-C, Singleton, J
Publikováno v:
Physical Review B
The magnetic ground state of the quasi-one-dimensional spin-1 antiferromagnetic chain is sensitive to the relative sizes of the single-ion anisotropy (D) and the intrachain (J) and interchain (J′) exchange interactions. The ratios D/J and J′/J di
Autor:
Davies, NR, Johnson, RD, Princep, AJ, Gannon, LA, Ma, JZ, Qian, T, Richard, P, Li, H, Shi, M, Nowell, H, Baker, PJ, Shi, YG, Ding, H, Luo, J, Guo, YF, Boothroyd, A
We report single-crystal x-ray-diffraction measurements on Na2Ti2Pn2O (Pn = As,Sb) which reveal a charge superstructure that appears below the density wave transitions previously observed in bulk data. From symmetry-constrained structure refinements
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https://doi.org/10.1103/physrevb.94.104515
https://doi.org/10.1103/physrevb.94.104515
Autor:
Beale, TA, Wilkins, SB, Johnson, RD, Bland, SR, Joly, Y, Forrest, TR, McMorrow, DF, Yakhou, F, Prabhakaran, D, Boothroyd, AT, Hatton, PD
Publikováno v:
Physical review letters, 2010, Vol.105(8), pp.087203 [Peer Reviewed Journal]
Physical Review Letters
Physical Review Letters, American Physical Society, 2010, 105, pp.087203. ⟨10.1103/PhysRevLett.105.087203⟩
Physical Review Letters
Physical Review Letters, American Physical Society, 2010, 105, pp.087203. ⟨10.1103/PhysRevLett.105.087203⟩
4 pages; International audience; We report the direct measurement of antiferromagnetic spin polarization at the oxygen sites in the multiferroic TbMn2O5, through resonant soft x-ray magnetic scattering. This supports recent theoretical models suggest
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https://ora.ox.ac.uk/objects/uuid:9ef709ed-7f2e-49e3-8827-be17cb56f927
https://ora.ox.ac.uk/objects/uuid:9ef709ed-7f2e-49e3-8827-be17cb56f927
Autor:
Johnson, RD, Nair, S, Chapon, LC, Bombardi, A, Vecchini, C, Prabhakaran, D, Boothroyd, AT, Radaelli, PG
By combining bulk properties, neutron diffraction and non-resonant X-ray diffraction measurements, we demonstrate that the new multiferroic Cu$_3$Nb$_2$O$_8$ becomes polar simultaneously with the appearance of generalised helicoidal magnetic ordering
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https://doi.org/10.1103/physrevlett.107.137205
https://doi.org/10.1103/physrevlett.107.137205
Autor:
Johnson, RD, Williams, S, Haghighirad, AA, Singleton, J, Zapf, V, Manuel, P, Mazin, II, Li, Y, Jeschke, HO, Valenti, R, Coldea, R
The layered honeycomb magnet alpha-RuCl3 has been proposed as a candidate to realize a Kitaev spin model with strongly frustrated, bond-dependent, anisotropic interactions between spin-orbit entangled jeff=1/2 Ru4+ magnetic moments. Here we report a
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https://ora.ox.ac.uk/objects/uuid:14bf858f-6664-4a2f-be3f-de881341dd53
https://ora.ox.ac.uk/objects/uuid:14bf858f-6664-4a2f-be3f-de881341dd53