Home
For authors
Submission status

Current
Archive (English)
Archive
   Volumes 81-92
   Volumes 41-60
   Volumes 21-40
   Volumes 1-20
   Volumes 61-80
      Volume 80
      Volume 79
      Volume 78
      Volume 77
      Volume 76
      Volume 75
      Volume 74
      Volume 73
      Volume 72
      Volume 71
      Volume 70
      Volume 69
      Volume 68
      Volume 67
      Volume 66
      Volume 65
      Volume 64
      Volume 63
      Volume 62
      Volume 61
Search
VOLUME 67 (1998) | ISSUE 11 | PAGE 934
Manganites at low temperatures and light doping: band approach and percolation
PACS: 75.10.Lp, 75.30.-m, 75.50.-y
A tight-band model is employed for the e29-orbitals in manganites. It is shown that a large intraatomic Hund's coupling, Jh and the resulting double-exchange mechanism lead to antiferromagnetic ordering along one of the cubic axis stabilized by the cooperative JT effect which further decreases the band energy of electrons. As a result, LaMnOs is a band insulator built of 2D ferromagnetic layers. The critical concentration xc ~ 0.16, for onset of ferromagnetic and metallic behavior at low temperatures in Lai-aSrzMnOs and the phase transition are treated in the percolation approach.