Pressure dependence of the superexchange interaction in antiferromagneticLa2CuO4
| Autor: | Meigan Aronson, B. S. Dennis, Sang-Wook Cheong, Zachary Fisk, Dierker Sb |
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| Rok vydání: | 1991 |
| Předmět: | |
| Zdroj: | Physical Review B. 44:4657-4660 |
| ISSN: | 1095-3795 0163-1829 |
| DOI: | 10.1103/physrevb.44.4657 |
| Popis: | Using high-pressure Raman scattering, we have directly measured the pressure dependence of the in-plane superexchange interaction J in antiferromagnetic ${\mathrm{La}}_{2}$${\mathrm{CuO}}_{4}$ between 1 bar and 100 kbar. We find that J has a substantially weaker pressure dependence than in conventional magnets. We also show that the Hubbard-model parameters describing the low-energy electronic structure are significantly influenced by out-of-plane compositional and structural variations. Finally, we show that the relationship between J and the Ne\'el temperature ${\mathit{T}}_{\mathit{N}}$ is poorly described by current theory. |
| Databáze: | OpenAIRE |
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