The importance of local band effects for ferromagnetism in hole doped La$_2$CuO$_4$

Details The importance of local band effects for ferromagnetism in hole doped La$_2$CuO$_4$ The importance of local band effects for ferromagnetism in hole doped La$_2$CuO$_4$

2008-09-18

arxiv.org/abs/0809.3246v1

Phys. Rev. Lett. 101, 157002 (2008)

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures, accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.101.157002

Band calculations for supercells of La$_{(2-x)}$Ba$_x$CuO$_4$ show that the rigid band model for doping is less adequate than what is commonly assumed. In particular, weak ferromagnetism (FM) can appear locally around clusters of high Ba concentration. The clustering is important at large dilution and averaged models for magnetism, such as the virtual crystal approximation, are unable to stabilize magnetic moments. These results give a support to the idea that weak FM can be the cause of the destruction of superconductivity at high hole doping.

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