Journal Article

PreJuSER-11952

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Magnetic correlations in the spin ice Ho2-xYxTi2O7 as revealed by neutron polarization analysis

Chang, L. J. ; Su, Y.FZJ* ; Kao, Y.-J. ; Chou, Y. Z. ; Mittal, R.FZJ* ; Schneider, H.FZJ* ; Brückel, T.FZJ* ; Balakrishnan, G. ; Lees, M. R.

2010
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/10968  doi:19.1103/PhysRevB.82.172403

Abstract: We present single-crystal magnetic diffuse neutron-scattering measurements with polarization analysis on the spin ice Ho2-xYxTi2O7 (x=0, 0.3, and 1). At 2 K, the spin-flip scattering patterns are typical of a nearest-neighbor spin ice and the effects of Y doping are seen in the widths of the pinch points. At low temperature, the spin-flip patterns are characteristic of a dipolar spin ice and are unaffected by Y doping. In the nonspin-flip channel, we observe the signature of strong antiferromagnetic correlations at the same temperature as the dipolar spin-ice correlations appear in the spin-flip channel. These experimental observations have been well reproduced by our Monte Carlo simulations.

Keyword(s): J

Note: We thank W. Schweika, P. Holdsworth, and B. Gaulin for valuable discussions, and M. Gingras and Y. Endoh for critical reading of the manuscript. This work was supported in Taiwan by Grants No. NSC 96-2739-M-213-001 and No. NSC 99-2112-M-007-020 (L.J.C.), and Grant No. NSC 97-2628-M-002-011-MY3 and NTU under Grants No. 98R0066-65 and No. 98R0066-68 (Y.Z.C. and Y.J.K.). Artur Glavic is acknowledged for implementing the DNSPLOT software package.

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Contributing Institute(s):

1. Streumethoden (IFF-4)
2. Neutronenstreuung (IFF-5)
3. JCNS (Jülich Centre for Neutron Science JCNS (JCNS) ; JCNS)
4. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)

Research Program(s):

1. BioSoft: Makromolekulare Systeme und biologische Informationsverarbeitung (P45)
2. Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) (P55)

Appears in the scientific report 2010

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