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APS » Journals » Phys. Rev. B » Volume 58 » Issue 22
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Phys. Rev. B 58, R14689–R14692 (1998)

Electron-doped manganese perovskites: The magnetic polaron state

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C. D. Batista, J. Eroles, M. Avignon*, and B. Alascio
Centro Atómico Bariloche and Instituto Balseiro, (8400) S. C. de Bariloche, Argentina

Received 18 September 1998; published in the issue dated 1 December 1998

Using the Lanczos method in linear chains we study the ground state of the double exchange model including an antiferromagnetic superexchange in the low concentration limit. We find that this ground state is always inhomogeneous, containing ferromagnetic polarons. The extension of the polaron spin distortion, the dispersion relation and its trapping by impurities, are studied for different values of the superexchange interaction and magnetic field. We also find repulsive polaron-polaron interaction.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.58.R14689
DOI:
10.1103/PhysRevB.58.R14689
PACS:
71.38.+i, 75.50.Cc

*Permanent address: Laboratoire d’Etudes des Propriétés Electroniques des Solides (LEPES)—BP166, 38042 Grenoble Cedex 9, France.

 
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