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Crystals 2018, 8(2), 88; doi:10.3390/cryst8020088

Coupling between Spin and Charge Order Driven by Magnetic Field in Triangular Ising System LuFe2O4+δ

ISIS Pulsed Neutron Facility, Rutherford Appleton Laboratory, Harwell Oxford, Didcot OX11 0QX, UK
Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, UK
Department of Physics, University of Warwick, Coventry CV4 7AL, UK
Authors to whom correspondence should be addressed.
Received: 19 January 2018 / Revised: 19 January 2018 / Accepted: 31 January 2018 / Published: 6 February 2018
(This article belongs to the Special Issue Non-Ambient Crystallography)
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We present a study of the magnetic-field effect on spin correlations in the charge ordered triangular Ising system LuFe2O4+δ through single crystal neutron diffraction. In the absence of a magnetic field, the strong diffuse neutron scattering observed below the Neel temperature (TN = 240 K) indicates that LuFe2O4+δ shows short-range, two-dimensional (2D) correlations in the FeO5 triangular layers, characterized by the development of a magnetic scattering rod along the 1/3 1/3 L direction, persisting down to 5 K. We also found that on top of the 2D correlations, a long range ferromagnetic component associated with the propagation vector k1 = 0 sets in at around 240 K. On the other hand, an external magnetic field applied along the c-axis effectively favours a three-dimensional (3D) spin correlation between the FeO5 bilayers evidenced by the increase of the intensity of satellite reflections with propagation vector k2 = (1/3, 1/3, 3/2). This magnetic modulation is identical to the charge ordered superstructure, highlighting the field-promoted coupling between the spin and charge degrees of freedom. Formation of the 3D spin correlations suppresses both the rod-type diffuse scattering and the k1 component. Simple symmetry-based arguments provide a natural explanation of the observed phenomenon and put forward a possible charge redistribution in the applied magnetic field. View Full-Text
Keywords: single crystal neutron diffraction; magnetic structure; diffuse scattering; charge order; spin frustration single crystal neutron diffraction; magnetic structure; diffuse scattering; charge order; spin frustration

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Ding, L.; Orlandi, F.; Khalyavin, D.D.; Boothroyd, A.T.; Prabhakaran, D.; Balakrishnan, G.; Manuel, P. Coupling between Spin and Charge Order Driven by Magnetic Field in Triangular Ising System LuFe2O4+δ. Crystals 2018, 8, 88.

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