Coupling between Spin and Charge Order Driven by Magnetic Field in Triangular Ising System LuFe2O4+δ
AbstractWe 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
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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.
Ding L, Orlandi F, Khalyavin DD, Boothroyd AT, 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(2):88.Chicago/Turabian Style
Ding, Lei; Orlandi, Fabio; Khalyavin, Dmitry D.; Boothroyd, Andrew T.; Prabhakaran, Dharmalingam; Balakrishnan, Geetha; Manuel, Pascal. 2018. "Coupling between Spin and Charge Order Driven by Magnetic Field in Triangular Ising System LuFe2O4+δ." Crystals 8, no. 2: 88.
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