Study of impurities in spin-Peierls systems including lattice relaxation

Details Study of impurities in spin-Peierls systems including lattice relaxation Study of impurities in spin-Peierls systems including lattice relaxation

1998-05-25

arxiv.org/abs/cond-mat/9805325v2

Phys. Rev. B 59, 13 557 (1999).

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.59.13557

The effects of magnetic and non-magnetic impurities in spin-Peierls systems are investigated allowing for lattice relaxation and quantum fluctuations. We show that, in isolated chains, strong bonds form next to impurities, leading to the appearance of magneto-elastic solitons. Generically, these solitonic excitations do not bind to impurities. However, interchain elastic coupling produces an attractive potential at the impurity site which can lead to the formation of bound states. In addition, we predict that small enough chain segments do not carry magnetic moments at the ends.

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