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Localized-Itinerant Electron Transitions in the Orthomanganites

  • John B. Goodenough (a1)

Abstract

The AMO3 perovskites containing transition-metal atoms M have an MO3 array with M-O-M bond angles 180°-φ in which the angle φ increases with the mismatch of the A-O and M-O equilibrium bond lengths. The tight-binding bandwidths for the π-bonding t and σ-bonding e orbitals of d-orbital parentage are Wπ < Wσ. In the orthomanganites Ln1−xAxMnO3 with A an alkaline earth, the octahedral-site high-spin Mn3+ ions have a d-electron configuration t3e1:5Eg that is orbitally twofold-degenerate, and the on-site electron-electron coulomb energy for adding a fifth d electron is Uσ ≈Wσ > Wπ. Consequently the equilibrium reaction t3e1 ≈ t3 σ*1 for a first-order transition from localized-e to itinerant-σ* electrons is shifted to the left as the bandwidth Wσ ≈ 12 εσλσ 2 cos φ is narrowed by increasing φ, by perturbations of the periodic potential of the MO3 array, and/or by increasing spin-disorder scattering; it is shifted to the right by oxidation of the MnO3 array, by application of a magnetic field, and by pressure. Cross-over from polaronic-e to itinerant-σ* electrons at a ferromagnetic Curie temperature Tc or a charge-ordering temperature Tco < Tc can give a “colossal” negative magnetoresistance provided the Fermi energy εF lies below a mobility edge μc in the narrow σ* band of the ferromagnetic phase. Cooperative Jahn-Teller distortions that remove the orbital degeneracy of a localized 5Eg configuration also introduce unusual antiferromagnetic ordering of the manganese-atom spins.

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1. Wollan, E.O. and Koehler, W. C., Phys. Rev. 100, 545 (1955)
2. Goodenough, J.B., Phys. Rev. 100, 564 (1955)
3. Zener, C., Phys. Rev. 81, 440(1951); 82, 403 (1951)
4. deGennes, P.-G., Phys. Rev. B 118, 141 (1960)
5. Jonker, G.H. and van Santen, J.H., Physica 16, 337 (1950)
6. Kusters, R.M., Singleton, J., Keen, D.A., McGreevy, R.,. and Hayes, W., Physica B 155, 362 (1989)
7. Shannon, R.D. and Prewitt, C.T., Acta Cryst. B25, 725 (1969); B26, 1046 (1970)
8. Goodenough, J.B., Kafalas, J.A., and Longo, J.M., in Preparative Methods in Solid State Chemistry, Hagenmuller, P., ed. (Academic Press, New York & London, 1972) Chap. 1
9. Goodenough, J.B., in Proc. 1st Polish-U.S. Conf. on High-Temperature Superconductors to be published in Lecture Notes in Physics (Springer-Verlag, Berlin, 1996)
10. Canfield, P.C., Thompson, J.D., Cheong, S.-W., Ruff, L.W., Phys. Rev. B47, 12 357 (1993)
11. Zhou, J.-S., Chen, H., and Goodenough, J.B., Phys. Rev. B49, 9084 (1994)
12. Goodenough, J.B. and Longo, J.M., Tabellen, Landolt-Börnstein, New Series, Group III, Vol.4, pt. a., Hellwege, K.H., ed. (Springer-Verlag, Berlin, 1970)p. 126
13. Mott, N.F. and Davis, E.A., Electronic Processes in Non-Crystalline Materials (Clarendon Press, Oxford, 1971)
14. Schiffer, P., Ramirez, A.P., Bao, W., and Cheong, S.W., Phys. Rev. Lett. 75, 3336 (1995)
15. Urushibara, A., Moritomo, Y., Arima, T., Asamitsu, A., Kido, G., Tokura, Y., Phys Rev. B51, 14 103 (1995)
16. Argyriou, D. N., Mitchell, J.F., Potter, C.D., Hinks, D.G., and Jorgenson, J.D., submitted
17. Goodenough, J.B., Wold, A., Arnott, R.J., and Menyuk, N., Phys. Rev. 124, 373 (1961)
18. Tokura, Y., Kuwahara, H., Tomioka, Y., Moritomo, Y., and Asamitsu, A., submitted; Science 270, 961 (1995)
19. Hwang, H.Y., Cheong, S.-W., Radaelli, P.G., Marezio, M., and Batlogg, B., Phys. Rev. Lett. 75, 914 (1995)
20. Archibald, W., Zhou, J.-S., and Goodenough, J.B., submitted

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Localized-Itinerant Electron Transitions in the Orthomanganites

  • John B. Goodenough (a1)

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