Investigating High-Tc Spiral Order In YBaCuFeO5 Multiferroic Single Crystal
The low-magnetic ordering temperatures critically restrict the potential uses of magnetoelectric multiferroics. YBaCuFeO5 displays magnetism-driven ferroelectricity at unexpectedly high temperatures. This structure being one of the best candidates [Nature Comm 7, 13758 (2016), Science Adv. 4(10), eaau6386 (2018)] to switchable, magnetism-driven ferroelectricity at zero field. This system shows an extraordinary tunability of its spiral ordering temperature, which can be extended beyond ambient temperature by manipulating the Cu/Fe chemical disorder. However, both a sinusoidal and a spiral magnetic order can give account of the magnetic intensities of the inconmensurate phase from neutron powder diffraction patterns. Although the spiral solution is usually adopted to explain ferroelectricity in polycrystalline samples, there is no yet magnetic refinements of this phase using full single-crystal data. This experiment is aimed to definitively remove the ambiguity between the sinusoidal and spiral models in the incommensurate phase of a quality YBaCuFeO5 crystal. To our knowledge, our sample presents the highest TS reported for YBCFO crystals.
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Jose Luis Garcia-Muņoz; FABELO ROSA Oscar Ramon; HERRERO MARTIN Javier; QURESHI Navid; RODRIGUEZ VELAMAZAN Jose Alberto; Arnau Romaguera and ZHANG XIAODONG. (2021). Investigating High-Tc Spiral Order In YBaCuFeO5 Multiferroic Single Crystal. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-41-1128
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