| Anti-ferromagnetism, spin-phonon interaction and the local-density approximation in high-T$_C$ superconductors (2004) | |||||||||
Abstract | |||||||||
| Results from different sets of band calculations for undoped and doped HgBa$_2$CuO$_4$ show that small changes in localization can lead to very different ground states. The normal LDA results are compared with 'modified' LDA results, in which different linearization energies make the O-p band more localized. The ground states in the normal calculations are far from the anti-ferromagnetic ones, while nearly AFM states are found in the modified calculations. The proximity of an AFM state in the doped system leads to increased $\lambda_{sf}$, and the modified band structure has favorable conditions for spin-phonon coupling and superconductivity mediated by spin fluctuations.. Comment: 4 pages, 2 figs., Accepted in J. Physics: Condensed Matter as a letter | |||||||||
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