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T c of Overdoped YLa 0.2 Ba 1.8 Cu 3 O 7.06+y and La 1.2 Ba 1.8 Cu 3 O 7.2+y

1997; Institute of Physics; Volume: 36; Issue: 4B Linguagem: Inglês

10.1143/jjap.36.l473

1347-4065

Bin Okai Kato,

Superconductivity in MgB2 and Alloys

Heat treatment of YLa 0.2 Ba 1.8 Cu 3 O 7.06 at high oxygen pressure produces overdoped YLa 0.2 Ba 1.8 Cu 3 O 7.06+ y ( y ≦0.7). Likewise, such treatment of La 1.2 Ba 1.8 Cu 3 O 7.2 produces overdoped La 1.2 Ba 1.8 Cu 3 O 7.2+ y ( y ≦0.8). With increasing y , T c of the former rises from 50 K ( y =0) to 90 K ( y =0.3), then fluctuates somewhat between 87 and 90 K up to y =0.7. In the case of the latter, although T c remains unchanged at 27 K with increase in y up to ∼0.2, the volume fraction of superconductivity is reduced to zero at y =0.2.