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

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

1
ISIS Pulsed Neutron Facility, Rutherford Appleton Laboratory, Harwell Oxford, Didcot OX11 0QX, UK
2
Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, UK
3
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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Abstract

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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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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