| Autor: |
Vladimir Hizhnyakov, Ernst Sigmund, G. S. Zavt |
| Rok vydání: |
1991 |
| Předmět: |
|
| Zdroj: |
Physical review. B, Condensed matter. 44(22) |
| ISSN: |
0163-1829 |
| Popis: |
We study the behavior of an extra hole added to the ground state of the antiferromagnetically ordered ${\mathrm{CuO}}_{2}$ plane. Both the Cu-O hybridization (characterized by parameter T) and the O-O transfer (\ensuremath{\sim}t) are taken into account, assuming \ensuremath{\Vert}T\ensuremath{\Vert}g\ensuremath{\Vert}t\ensuremath{\Vert}. As has been shown previously [V. Hizhnyakov and E. Sigmund, Physica C 156, 655 (1988)]. The energetically most favorable situation is given when a localized state is formed in which the antiferromagnetic order is locally destroyed and a small ferromagnetic cluster (ferron) is built up. We show that due to the increase of the magnetic energy induced by the spin-flip process (${\mathit{E}}_{\mathit{s}}$\ensuremath{\sim}0.25 eV) the localized and the metastable free-hole states are separated by a barrier of energy \ensuremath{\delta}\ensuremath{\sim}${\mathit{E}}_{\mathit{s}}$t/2T, which can reveal in various kinetic phenomena. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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