Spin ladders: new high-temperature superconductors

Henryk Szymczak; Rita Szymczak; Marek Baran; Lydia Leonyuk; Jurgis G. Babonas; Vladimir M. Maltsev

doi:10.1117/12.342995

24 March 1999 Spin ladders: new high-temperature superconductors

Henryk Szymczak, Rita Szymczak, Marek Baran, Lydia Leonyuk, Jurgis G. Babonas, Vladimir M. Maltsev

Proceedings Volume 3724, International Conference on Solid State Crystals '98: Single Crystal Growth, Characterization, and Applications; (1999) https://doi.org/10.1117/12.342995
Event: International Conference on Solid State Crystals '98, 1998, Zakopane, Poland

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).

Citation Download Citation

Henryk Szymczak, Rita Szymczak, Marek Baran, Lydia Leonyuk, Jurgis G. Babonas, and Vladimir M. Maltsev "Spin ladders: new high-temperature superconductors", Proc. SPIE 3724, International Conference on Solid State Crystals '98: Single Crystal Growth, Characterization, and Applications, (24 March 1999); https://doi.org/10.1117/12.342995

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