Browsing by Author "Princep, AJ"
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- ItemCircularly polarized soft x-ray diffraction study of helical magnetism in hexaferrite(American Physical Society, 2010-03-01) Mulders, AM; Lawrence, SM; Princep, AJ; Staub, U; Bodenthin, Y; García-Fernández, M; Garganourakis, M; Hester, JR; Macquart, RB; Ling, CDMagnetic spiral structures can exhibit ferroelectric moments as recently demonstrated in various multiferroic materials. In such cases the helicity of the magnetic spiral is directly correlated with the direction of the ferroelectric moment and measurement of the helicity of magnetic structures is of current interest. Soft x-ray resonant diffraction is particularly advantageous because it combines element selectivity with a large magnetic cross-section. We calculate the polarization dependence of the resonant magnetic x-ray cross-section (electric dipole transition) for the basal plane magnetic spiral in hexaferrite Ba0.8Sr1.2Zn2Fe12O22 and deduce its domain population using circular polarized incident radiation. We demonstrate there is a direct correlation between the diffracted radiation and the helicity of the magnetic spiral. © 2010, American Physical Society
- ItemResonant x-ray diffraction and the observation of strange quantities(Australian Institute of Physics, 2012-02-02) Princep, AJ; Mulders, AM; Schierle, E; Weschke, E; Hester, JR; Hutchinson, WD; Tanaka, Y; Terada, N; Narumi, Y; Staub, U; Scagnoli, V; Nakamura, T; Kikkawa, A; Lovesey, SW; Balcar, ECondensed matter physics has a growing reputation for providing an opportunity to observe exotic particles and states of matter that have an analogue in other areas of physics. Examples of this include the observation of Dirac strings and magnetic monopoles in spin-ice materials , spinon / holon separation in gated nanowires , and toroidal moments (anapoles) in the ubiquitous cuprates . Resonant X-ray Diffraction (RXD) is well suited to the observation of a variety of quantities that behave differently under time reversal, coordinate inversion, and rotation . It is possible to distinguish between competing orders and we have determined the orbital order in RB2C2, including higer order terms (as illustrated on the cover page) [5,6]
- ItemREXS contribution to electronic ordering investigation in solids(Springer Heidelberg, 2012-06-01) Beale, TAW; Beutier, G; Bland, SR; Bombardi, A; Bouchenoire, L; Bunau, O; Di Matteo, S; Fernandez-Rodriguez, J; Hamann-Borrero, JE; Herrero-Martin, J; Jacques, VLR; Johnson, RD; Juhin, A; Matsumura, T; Mazzoli, C; Mulders, AM; Nakao, H; Okamoto, J; Partzsch, S; Princep, AJ; Scagnoli, V; Strempfer, J; Vecchini, C; Wakabayashi, Y; Walker, HC; Wermeille, D; Yamasaki, YResonant Elastic X-Ray Scattering (REXS) has played a fundamental role in understanding electronic properties and in revealing hidden order, local symmetries and exotic states realized in correlated solids. This article reports on some of the relevant scientific contributions and technical advances over the last 20 years, by providing a list of related publications produced by various groups all around the world. The given perspective is that of a group of young scientists involved at various times in the investigation of the beauty of electronic ordering by the REXS technique. © 2012, Springer.
- ItemTriakontadipole and high-order dysprosium multipoles in the antiferromagnetic phase of DyB2C2(IOP Publishing Ltd., 2011-07-06) Princep, AJ; Mulders, AM; Staub, U; Scagnoli, V; Nakamura, T; Kikkawa, A; Lovesey, SW; Balcar, EResonant soft x-ray Bragg diffraction at the Dy M-4,M-5 edges has been used to study Dy multipoles in the combined magnetic and orbitally ordered phase of DyB2C2. The analysis incorporates both the intra-atomic magnetic and quadrupolar interactions between the 3d core and 4f valence shells. Additionally, we introduce to the formalism the interference of magnetic and nonmagnetic oscillators. This allows a determination of the higher-order multipole moments of rank 1 (dipole) to 6 (hexacontatetrapole). The strength of the Dy 4f multipole moments have been estimated as being up to 80% of the quadrupolar moment.(c) 2011 IOP Publishing LTD