Single crystals of Pb2Sr2Ho0.5Ca0.5Cu3O8 have been grown in Pt, Al2O3 and Au crucibles by means of the flux method. The effect of contamination from the crucible on Tc has been investigated by studing the effects of Cu-site substitution on Tc and magnetic properties for sintered polycrystals of Pb2Sr2R0.5Ca0.5(Cu1- y M y)3O8 with R= Ho or Y and M= Pt or Al. Consequently it has been found that use of a Pt crucible leads to growth of single crystals of the best quality with high T c values and that Al2O3 and Au crucibles contaminate the single crystals to decrease T c. Anisotropy in the electrical resistivity of the single-crystal Pb2Sr2Ho0.5Ca0.5Cu3O8 has been found to be comparable to that of YBa2Cu3O7 in spite of its thick blocking layer suggesting that the wave functions of conduction electrons moderately overlap along the c-axis in Pb2Sr2Ho0.5Ca0.5Cu3O8.
ASJC Scopus subject areas
- Physics and Astronomy(all)