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- W2038419639 abstract "Holes doped on edge-sharing CuO 2 chains are almost localized because of nearly orthogonal Cu-O-Cu bonds. Consequently, only spin degrees of freedom survive at low temperatures, which sometimes presents unusual quantum magnetism. Quasi-one-dimensional cupric oxides Ca 1-x CuO 2+δ and Sr 14 Cu 24 O 41 , both containing 25-50% hole-doped edge-sharing CuO 2 chains, are studied by uniform magnetic susceptibility and specific heat measurements on a series of polycrystalline samples with controlled metal and oxygen contents. Most spins are always dimerized in Sr 14 Cu 24 O 41 , while, in contrast, antiferromagnetic chains made of nearly 50% spins exist with the remainder forming dimers of variable density in Ca 1 CuO 2 . A two-sublattice model is proposed by considering that the nearest-neighbor couplings are negligibly small, due to both geometrical frustration and the special Cu-O-Cu bond angle of ∼95°." @default.
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- W2038419639 date "2001-04-01" @default.
- W2038419639 modified "2023-09-30" @default.
- W2038419639 title "S=1/2 antiferromagnetic chains and dimers on hole-doped edge-sharing CuO2 chains" @default.
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- W2038419639 doi "https://doi.org/10.1016/s0925-8388(00)01314-1" @default.
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