On the 110 K Superconductor in the Bi-Ca-Sr-Cu-O System

Abstract

We found a new compound in the Bi-Ca-Sr-Cu-O system which has a different structure from the 80 K superconductor Bi 2 (Ca, Sr) 3 Cu 2 O y . The c -dimension of this compound is ∼37 Å and is ∼6 Å longer than that of Bi 2 (Ca, Sr) 3 Cu 2 O y . Although we have not obtained a single-phased sample yet, the clear correlation between the diamagnetic susceptibility just below 110 K and the content of this compound included in the sample strongly suggests that the compound with c ≈37 Å is responsible for the superconductivity of T c ∼110 K.