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- W2045804799 abstract "Recent studies of the structural and magnetic properties of spin-ladder compounds will be reviewed. The spin ladders of the composition (M<SUB>2</SUB>Cu<SUB>2</SUB>O<SUB>3</SUB>)<SUB>m</SUB>(CuO<SUB>2</SUB>)<SUB>n</SUB> (where M are divalent and trivalent cations) have both CuO<SUB>2</SUB> ribbons and Cu<SUB>2</SUB>O<SUB>3</SUB> 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 (M<SUB>2</SUB>Cu<SUB>2</SUB>O<SUB>3</SUB>)<SUB>5</SUB>(CuO<SUB>2</SUB>)<SUB>7</SUB> 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)." @default.
- W2045804799 created "2016-06-24" @default.
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- W2045804799 date "1999-03-24" @default.
- W2045804799 modified "2023-10-14" @default.
- W2045804799 title "Spin ladders: new high-temperature superconductors" @default.
- W2045804799 doi "https://doi.org/10.1117/12.342995" @default.
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