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Title: Pressure-induced charge orders and their postulated coupling to magnetism in hexagonal multiferroic LuFe2O4

Journal Article · · npj Quantum Materials
 [1];  [2];  [2]; ORCiD logo [3];  [4]; ORCiD logo [5]; ORCiD logo [5];  [6]; ORCiD logo [7]; ORCiD logo [8]; ORCiD logo [9]; ORCiD logo [10]; ORCiD logo [3];  [8]; ORCiD logo [8]; ORCiD logo [3]
  1. Fudan Univ., Shanghai (China); Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing (China); Nanchang Univ. (China)
  2. Fudan Univ., Shanghai (China)
  3. Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing (China)
  4. Univ. of Hawaii at Manoa, Honolulu, HI (United States). Dept. of Physics and Astronomy
  5. Argonne National Laboratory (ANL), Argonne, IL (United States)
  6. Brookhaven National Laboratory (BNL), Upton, NY (United States)
  7. Univ. of Nebraska, Lincoln, NE (United States)
  8. Fudan Univ., Shanghai (China); Nanjing Univ. (China); Shanghai Qi Zhi Inst. (China); Shanghai Research Center for Quantum Sciences (China)
  9. Fudan Univ., Shanghai (China); Nanjing Univ. (China)
  10. 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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