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Proceedings Paper

Spin ladders: new high-temperature superconductors
Author(s): Henryk Szymczak; Rita Szymczak; Marek Baran; Lydia Leonyuk; Jurgis G. Babonas; Vladimir M. Maltsev
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Paper Abstract

Recent studies of the structural and magnetic properties of spin-ladder compounds will be reviewed. The spin ladders of the composition (M2Cu2O3)m(CuO2)n (where M are divalent and trivalent cations) have both CuO2 ribbons and Cu2O3 two-leg ladders. Both of the building blocks show spin gaps in their excitation spectra which originate from a dimerized state. In the reviewed systems it is possible to change the number of hole carriers by changing the ratio Ca/Sr. The hole carriers are considered to be localized in the chains (ribbons) and are coupled with the copper spins forming the Zhang-Rice singlets. The dimers are formed between next-nearest neighbor copper ions. The charge ordering involving both dimerization and the Zhang-Rice singlet formation is suggested to exist in (M2Cu2O3)5(CuO2)7 compounds. In some compounds with high Ca/Sr ratio and with substantial hole transfer from ribbons to ladders the superconducting state is created with a high critical temperature (of about 80 K).

Paper Details

Date Published: 24 March 1999
PDF: 11 pages
Proc. SPIE 3724, International Conference on Solid State Crystals '98: Single Crystal Growth, Characterization, and Applications, (24 March 1999);
Show Author Affiliations
Henryk Szymczak, Institute of Physics (Poland)
Rita Szymczak, Institute of Physics (Poland)
Marek Baran, Institute of Physics (Poland)
Lydia Leonyuk, Moscow State Univ. (Russia)
Jurgis G. Babonas, Semiconductor Physics Institute (Lithuania)
Vladimir M. Maltsev, Moscow State Univ. (Russia)

Published in SPIE Proceedings Vol. 3724:
International Conference on Solid State Crystals '98: Single Crystal Growth, Characterization, and Applications
Andrzej Majchrowski; Jerzy Zielinski, Editor(s)

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