Pressure-induced charge orders and their postulated coupling to magnetism in hexagonal multiferroic LuFe2O4
- Fudan Univ., Shanghai (China); Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing (China); Nanchang Univ. (China)
- Fudan Univ., Shanghai (China)
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing (China)
- Univ. of Hawaii at Manoa, Honolulu, HI (United States). Dept. of Physics and Astronomy
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Univ. of Nebraska, Lincoln, NE (United States)
- Fudan Univ., Shanghai (China); Nanjing Univ. (China); Shanghai Qi Zhi Inst. (China); Shanghai Research Center for Quantum Sciences (China)
- Fudan Univ., Shanghai (China); Nanjing Univ. (China)
- Fudan Univ., Shanghai (China); Nanjing Univ. (China); Shanghai Qi Zhi Inst. (China)
Hexagonal LuFe2O4 is a promising charge order (CO) driven multiferroic material with high charge and spin-ordering temperatures. The coexisting charge and spin orders on Fe3+/Fe2+ sites result in magnetoelectric behaviors, but the coupling mechanism between the charge and spin orders remains elusive. Here, by tuning external pressure, we reveal three charge-ordered phases with suggested correlation to magnetic orders in LuFe2O4: (i) a centrosymmetric incommensurate three-dimensional CO with ferrimagnetism, (ii) a non-centrosymmetric incommensurate quasi-two-dimensional CO with ferrimagnetism, and (iii) a centrosymmetric commensurate CO with antiferromagnetism. Experimental in situ single-crystal X-ray diffraction and X-ray magnetic circular dichroism measurements combined with density functional theory calculations suggest that the charge density redistribution caused by pressure-induced compression in the frustrated double-layer [Fe2O4] cluster is responsible for the correlated spin-charge phase transitions. The pressure-enhanced effective Coulomb interactions among Fe-Fe bonds drive the frustrated (1/3, 1/3) CO to a less frustrated (1/4, 1/4) CO, which induces the ferrimagnetic to antiferromagnetic transition. Our results not only elucidate the coupling mechanism among charge, spin, and lattice degrees of freedom in LuFe2O4, but also provide a new way to tune the spin-charge orders in a highly controlled manner.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Natural Science Foundation of China (NSFC); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
- Grant/Contract Number:
- AC02-06CH11357; FG02-99ER45775; NA0001974
- OSTI ID:
- 2378609
- Journal Information:
- npj Quantum Materials, Journal Name: npj Quantum Materials Journal Issue: 1 Vol. 8; ISSN 2397-4648
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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