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We have investigated the magnetic properties of one-dimensional (1D) compounds An+2Con+1O3n+3 (A=Ca, Sr, Ba) by susceptibility measurements. The transition to a partially disordered antiferromagnetic state, which takes place at 25K for Ca3Co2O6 (n=1), was not observed down to 2K for the n=2–5 samples, except that a precursory behavior was found for n=2 below 3.2K. The absence of a long-range order...
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