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Exact diagonalization studies of doped Heisenberg spin rings

J. Schnack, F. Ouchni

cond-mat.str-elarXiv:cond-mat/0406592

Abstract

Motivated by magnetization studies of the "telephon number compound" Sr14Cu24O41 we investigate doped Heisenberg spin rings by means of complete numerical diagonalization of a Heisenberg Hamiltonian that depends parametrically on hole positions. A comparison with experimental magnetization data reveals rather accurate information about the screened electrostatic interaction between the charged holes on the ring which appears to be astonishingly strong.

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