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Journal of Superconductivity

, Volume 7, Issue 6, pp 901–907 | Cite as

Magnetic order in thet-J andt-t′-J models

  • Hiroyuki Mori
  • Minoru Hamada
Article

Abstract

The magnetic structure of thet-J andt-t′-J models are investigated. Assuming that the ground state has magnetic long-range order, we calculated the energy of some magnetically ordered states using a simple transformation of the models and theS→∞ approximation. The result shows that the Néel state is destroyed by doped holes unless the next-nearest neighbor hoppingt′ is finite, and that the ferromagnetic phase appears at moderate doping. Mean field analysis shows that the intermediate phase between the Néel and ferromagnetic phase has spiral spin order, although the spiral phase is shown to be unstable against density fluctuations.

Key words

Magnetic order t-J model t-t′-J model 

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Copyright information

© Plenum Publishing Corporation 1994

Authors and Affiliations

  • Hiroyuki Mori
    • 1
  • Minoru Hamada
    • 2
  1. 1.Department of PhysicsIndiana UniversityBloomington
  2. 2.Department of Materials Science, Faculty of ScienceHiroshima UniversityHigashi-HiroshimaJapan

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