Abstract
The super-exchange interaction parametersI(Fe, Cr) of Fe3+ and Cr3+ in iron doped rate-earth orthochromitesRCr0.99Fe0.01 O3 (R=La, La0.5Nd0.5, Nd, Sm, Gd, Dy, Y, Er, Yb or Lu) have been obtained from57Fe magnetic hyperfine structure measurementsvia the Mössbauer effect.
The dependence of the experimental valuesI(Fe, Cr) on the Fe−O−Cr average superexchange angle θ (depending upon the relative size of the rare-earth (RE) ionR 3+) is well described by the equationI(d5, dN) = α N + β N cosθ + γ N cos2 θ.
Within the accessible range of super-exchange angles 142°≲θ≲156°, the Fe3+−O2−−Cr3+ interaction is negative (antiferromagnetic). However, a theoretical analysis predicts a sign reversal forI(Fe, Cr.) at about θ ≈ 162° and thus ferromagnetic character of the interaction between 162° and 180°.
The spin-only super-exchange interaction integrals fore g andt 2g electrons, separately, are also calculated. Their angular dependence is accounted for by the behaviour of the antiferromagnetic kinetic and ferromagnetic potential exchange which are of different character when passing from 180° to 90° super-exchange geometry. The magnitude and the sign of the spin-only super-exchange integral for an arbitrary 3d cation, pair is predicted.
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References
I. Kanamori, J. Phys. Chem. Solids 10 (1959) 87.
J.B. Goodenough, Phys. Rev. 100 (1955) 564.
M.A. Butler, M. Eibschütz and L.G. van Uitert, Solid State Commun. 12 (1973) 499.
N.S. Ovanesyan and V.A. Trukhtanov, JETPh (pisma) 17 (1973) 98.
J. Owen and D.P. Taylor, J. Appl. Phys. 39 (1968) 791;
D.P. Taylor, J. Owen and B. Wanklyn, J. Phys. C6 (1973) 2611.
M. Marezio, J.P. Remeika and P.D. Dernier, Acta Cryst. B26 (1970) 2008.
K. Motida and S. Miyahara, J. Phys. Soc. Japan 28 (1970), 1188.
M. Eibschütz, S. Shtrikman and D. Treves, Phys. Rev. 156, (1967) 562.
J.M.D. Coey and G.A. Sawatzky, Phys. Stat. Sol. (b) 44 (1971) 673.
J.M.D. Coey, Phys. Rev. B6 (1972) 3240.
M.A. Butler, M. Eibschütz and L.G. van Uitert Phys. Rev. 179 (1969) 343.
E.F. Bertaut et al., J. Appl. Phys. 37 (1966) 1038.
G.A. Sawatzky, C. Boekema and F. van der Woude, Proc. Int. Conf. on Mössbauer Spectrometry, Dresden, 1971, V. 1 (1971) 238.
G. Gorodetsky et al., Phys. Rev. 187 (1970) 637; Solid State Commun. 7 (1969) 67.
N.L. Huang et al., Phys. Rev. 156 (1967) 383.
Y. Miyahara and S. Iida, J. Phys. Soc. Japan 33 (1972) 849.
V.D. Doroshev, N.M. Kovtun and V.N. Selesnev, Phys. Stat. Sol. (a) 13 (1972) K41.
N.S. Ovanesyan and V.A. Trukhtanov, Proc. 5th Int. Conf. on Mössbauer Spectrometry, Bratislava, 1973, Part I (1975) 157.
P. Freund, J. Owen and B.F. Hann, J. Phys. C6 (1973) L139.
B.C. Tofield and B.E.F. Fender, J. Phys. Chem. Sol. 31 (1970) 2741.
P.W. Anderson, Phys. Rev. 115 (1959) 2.
A.A. Sidorov, Phis. Tverd. Tela 16 (1974) 625.
C. Boekema, F. van der Woude and G.A. Sawatzky, Int. J. Magn. 3 (1972) 341.
S. Freeman, Phys. Rev. B7 (1973) 3960.
J. Goodenough, ed., Magnetism and the Chemical Bond, (Wiley & Sons, New York-London, 1963).
A.S. Moskvin, Phis. Tverd. Tela 12 (1970) 3208.
D. Treves, M. Eibschütz and P. Coppens, Phys. Letters 18 (1965) 216.
A.S. Moskvin, Izv. Acad. Nauk SSSR, ser. phys. 36 (1972) 1395.
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Moskvin, A.S., Ovanesyan, N.S. & Trukhtanov, V.A. Angular dependence of the superexchange interaction Fe3+-O2−-Cr3+ . Hyperfine Interact 1, 265–281 (1975). https://doi.org/10.1007/BF01022459
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DOI: https://doi.org/10.1007/BF01022459