Abstract
Single crystals of spin ladder-like compound CaCu 2O 3 (2-leg) have been grown by the traveling-solvent floating-zone method. It was shown that crystal quality depends much on the starting composition to form solvent (flux), oxygen pressure and growth rate. Large-size, inclusion-free CaCu 2O 3 crystals were grown under high oxygen pressure (7 bar) using CuO-poor starting composition (CaO:CuO=2:1) to form the solvent. Ca(Cu 1− x Zn x ) 2O 3 ( x=0.035, 0.07, 0.14) crystals grown under identical conditions contained inclusions such as Ca 2CuO 3 or CaO. Compositional analyses by energy-dispersive X-ray spectroscopy (EDXS) indicate that the Zn-ions are substituted at both Ca- and Cu-sites. All samples show antiferromagnetic behavior.
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