Muons and magnets

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Local magnetism and magnetoelectric effect in HoMnO3 studied with muon-spin relaxation

Physical Review B - Condensed Matter and Materials Physics 81:1 (2010)

Authors:

HJ Lewtas, T Lancaster, PJ Baker, SJ Blundell, D Prabhakaran, FL Pratt

Abstract:

We present the results of muon-spin relaxation (μ+ SR) measurements on the hexagonal manganite HoMnO3. Features in the temperature-dependent relaxation rate λ correlate with the magnetic transitions at 76, 38, and 34 K. The highest temperature transition, associated with the ordering of Mn3+ moments has the largest effect on λ. The application of a static electric field of E=5× 106 Vm-1 below T=50K causes a small reduction in λ which is suggestive of coupling between ferroelectric and magnetic domain walls in the ordered state of the material. © 2010 The American Physical Society.
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The Earth: Its Origin, History and Physical Constitution, 6th edition, by Sir Harold Jeffreys

Contemporary Physics Taylor & Francis 51:1 (2010) 95-96
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The Pursuit of Perfect Packing, by T. Aste and D. Weaire

Contemporary Physics Taylor & Francis 51:1 (2010) 94-95
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Magnetic and structural properties of monoradicals and diradicals based on thienyl-substituted nitronyl nitroxide

Physica B: Condensed Matter (2010)

Authors:

T Sugano, SJ Blundell, W Hayes, P Day, H Mori
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Charge order, enhanced orbital moment, and absence of magnetic frustration in layered multiferroic LuFe2 O4

Physical Review B - Condensed Matter and Materials Physics 80:22 (2009)

Authors:

K Kuepper, M Raekers, C Taubitz, M Prinz, C Derks, M Neumann, AV Postnikov, FMF De Groot, C Piamonteze, D Prabhakaran, SJ Blundell

Abstract:

Electronic and magnetic properties of the charge ordered phase of LuFe2 O4 are investigated by means of x-ray spectroscopic and theoretical electronic structure approaches. LuFe2 O4 is a compound showing fascinating magnetoelectric coupling via charge ordering. Here, we identify the spin ground state of LuFe2 O4 in the charge ordered phase to be a 2:1 ferrimagnetic configuration, ruling out a frustrated magnetic state. An enhanced orbital moment may enhance the magnetoelectric coupling. Furthermore, we determine the densities of states and the corresponding correlation potentials by means of x-ray photoelectron and emission spectroscopies, as well as electronic structure calculations. © 2009 The American Physical Society.
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