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2 Acta Physica Polonica A

2 2000

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Destruction of Antiferromagnetic Order by Localized Polarons

100%

Wilamowski Z. , Hankiewicz E.

Acta Physica Polonica A

2000

tom 97

nr 3

403-406

Analysis of a finite spin cluster indicates a possibility of the formation of purely magnetic polarons in low-dimensional antiferromagnets. It is shown that for parameters characteristic of CuO_{2} based superconductors a strong antiferromagnetic polaron can occur. The destruction of antiferromagnetic order by the presence of a magnetic polaron is discussed.

"Comb-Like" Polarons and Bipolarons in High-T_{c} Materials

80%

Hankiewicz E. , Buczko R. , Wilamowski Z.

Acta Physica Polonica A

2000

tom 97

nr 1

185-188

Diagonalization of Hamiltonian composed from d-d exchange interactions between localized d spins of antiferromagnetic cluster and p-d interaction with the spin of carriers indicates a possibility of formation of pure magnetic polarons. The most energetically favorable solution occurs when the carrier density in CuO_{2} planes is distributed on every second spin. These "comb-like" polarons have a tendency to bind into pairs (bipolarons) "glued" by the antiferromagnetic medium.