SmxBa1-xCuOyの微細構造と磁束線のピン止め効果

概要

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The substitution for the Ba sites in Sm1/3Ba2/3CuOy (=SmBa2Cu3Oy) by Sm induces the local oxygen disordering in the Cul-O planes since the Sm atoms located on the Ba sites are apt to have eight oxygen coordination. In order to investigate the effectiveness of the disordered oxygens as pinning centers for flux lines in SmxBa1-xCuOy, the magnetic hysteresis curves were examined by SQUID magnetometer. As a result, the critical current density Jc, which is estimated from the magnetic hysteresis curves, decreased with increase of degree of the oxygen disordering in the Cul-O planes of SmxBa1-xCuOy. Thus, the disordered oxygens do not act as effective pinning centers. This result is in contrast to the result in YBa2(Cu1-xFex)3Oy system where the Jc has the maximum value at about x=0.02, and indicates that the increase of Jc in the YBa2(Cu1-xFex)3Oy system is ascribed not to the disordering oxygens, but to the clustered Fe atoms.
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