Robust charge and magnetic order under electric field and current in the multiferroic LuFe2O4 - Condensed Matter > Materials ScienceReport as inadecuate




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Abstract: We performed elastic neutron scattering measurements on the charge- andmagnetically-ordered multiferroic material LuFe2O4. An external electricfield along the 001 direction with strength up to 20 kV-cm applied at lowtemperature ~100 K does not affect either the charge or magnetic structure.At higher temperatures ~360 K, before the transition to three-dimensionalcharge-ordered state, the resistivity of the sample is low, and an electriccurrent was applied instead. A reduction of the charge and magnetic peakintensities occurs when the sample is cooled under a constant electric current.However, after calibrating the real sample temperature using its ownresistance-temperature curve, we show that the actual sample temperature ishigher than the thermometer readings, and the -intensity reduction- is entirelydue to internal sample heating by the applied current. Our results suggest thatthe charge and magnetic orders in LuFe2O4 are unaffected by the applicationof external electric field-current, and previously observed electricfield-current effects can be naturally explained by internal sample heating.



Author: Jinsheng Wen, Guangyong Xu, Genda Gu, S. M. Shapiro

Source: https://arxiv.org/







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