Abstract
Carrier concentration of high-T c oxide, Bi 2(Sr, Ca) 3Cu 2O 8 has been successfully varied by the substitution of Ca atoms with Y and by a thermal treatment at relatively low temperatures in (0.9Ar + 0.1H 2) gas flow. Various physical properties have been measured through the metal-insulator boundary, the results of which indicate that these properties are quite similar to those of other well known high-T c oxides. The relationship between the magnetic susceptibility and the hole concentration suggests that a crossover of the character of electronic spin system takes place at the metal (superconducting)- insulator boundary from the localized and fluctuating to the band character.
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