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- W3036612001 abstract "Spin-reorientation (SR) transition as a kind of magnetic phase transition is the most peculiar and interesting phenomenon for rare-earth orthoferrites RFeO3, the research on which is important not only for practical applications but also for physical theory. In this article, we report a new and novel second-order SR transition Γ4 (Gx, Ay, Fz) → Γ2 (Fx, Cy, Gz) at around TSR2 = 126 K, besides the normal first-order SR transition Γ4 (Gx, Ay, Fz) → Γ1 (Ax, Gy, Cz) at around TSR1 = 230 K, in orthoferrite CeFeO3 induced by intrinsic doping with oxygen ions. The twofold SR transition of type Γ4 → Γ41 → Γ42 for the Fe3+ magnetic sublattices in CeFeO3 shows different natures. By the result analyses of magnetism and specific heat, it is confirmed that the first-order SR transition Γ4 → Γ1 is attributed to the Ce3+–Fe3+ ferromagnetic (FM) interaction, but the second-order SR transition at TSR2 = 126 K is ascribed to the Fe2+–Fe3+ double-exchange FM interaction in Fe sublattices due to the substitution of nonmagnetic Ce4+ ions with magnetic Ce3+ ions and the valence fluctuation in R sublattices. This new mechanism is different from that for Dy0.5Pr0.5FeO3 and Mn-doped SmFeO3 with a twofold SR transition. Both Ce3+–Fe3+ and Fe2+–Fe3+ FM interactions in CeFeO3 have an effect on the free energy. The combination and competition of Ce3+–Fe3+ and Fe2+–Fe3+ FM interactions dominate the SR transition taking the first-order one (Γ4 → Γ1) or the second-order one (Γ4 → Γ2), which can be adjusted by both the distributions of the magnetism and valent states of R ions in the R-site of orthoferrites RFeO3." @default.
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- W3036612001 date "2020-06-17" @default.
- W3036612001 modified "2023-09-24" @default.
- W3036612001 title "Spin-Reorientation Transition Driven by Double Exchange in CeFeO<sub>3</sub> Ceramics" @default.
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- W3036612001 doi "https://doi.org/10.1021/acs.jpcc.0c00379" @default.
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