Is the pi-particle responsible for the 41 meV peak in YBa_2Cu_3O_7?

Details Is the pi-particle responsible for the 41 meV peak in YBa_2Cu_3O_7? Is the pi-particle responsible for the 41 meV peak in YBa_2Cu_3O_7?

1997-05-06

arxiv.org/abs/cond-mat/9705049v1

Phys. Rev. Lett. 79, 4898 (1997)

Physics

Condensed Matter

Superconductivity

3 pages, latex (revtex)

Scientific paper

10.1103/PhysRevLett.79.4898

It is argued that there is no low-energy resonance associated with the
pi-operators introduced by Demler and Zhang. This implies that the Hubbard
model does not possess an approximate SO(5) symmetry generated by these
operators. Recent finite-size studies are re-interpreted accordingly.

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