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Title: Spin-reorientation transitions in the Cairo pentagonal magnet Bi 4 Fe 5 O 13 F

Here, we show that interlayer spins play a dual role in the Cairo pentagonal magnet Bi 4Fe 5O 13F, on one hand mediating the three-dimensional magnetic order, and on the other driving spin-reorientation transitions both within and between the planes. The corresponding sequence of magnetic orders unraveled by neutron diffraction and Mössbauer spectroscopy features two orthogonal magnetic structures described by opposite local vector chiralities, and an intermediate, partly disordered phase with nearly collinear spins. A similar collinear phase has been predicted theoretically to be stabilized by quantum fluctuations, but Bi 4Fe 5O 13F is very far from the relevant parameter regime. While the observed in-plane reorientation cannot be explained by any standard frustration mechanism, our ab initio band-structure calculations reveal strong single-ion anisotropy of the interlayer Fe 3+ spins that turns out to be instrumental in controlling the local vector chirality and the associated interlayer order.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ; ORCiD logo [5] ;  [6]
  1. Univ. of Augsburg (Germany). Experimental Physics VI, Center for Electronic Correlations and Magnetism
  2. Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy
  3. Lomonosov Moscow State Univ., Moscow (Russia). Dept. of Chemistry
  4. Univ. of Antwerp, Antwerp (Belgium). Electron microscopy for materials science (EMAT)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  6. Lomonosov Moscow State Univ., Moscow (Russia). Dept. of Chemistry; Skolkovo Inst. of Science and Technology, Moscow (Russia)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; 14-13-00680
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 9; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE; Russian Science Foundation
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1410907