Abstract
A phase diagram for the boron-doped new superconductor Sr 2CuO 2(CO 3) 1− x (BO 3) x has been systematically investigated. The parent compound Sr 2CuO 2(CO 3) is an antiferromagnetic (AF) insulator with a Néel temperature of T N∼285 K. T N of Sr 2CuO 2(CO 3) 1− x (BO 3) x changes drastically with increasing boron content x. In the lightly doped AF state (0≤ x≤0.04), the strong superexchange interaction within the CuO 2-layers still yields a long-range AF ordering. The superconductivity is confined to the narrow compositional range 0.04≤ x≤0.15 and its highest T c is 32 K at x=0.15.
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