Superconductivity in the Pb-based 1222 Cuprate Containing Boron, (Pb0.5B0.5) Sr2(Y1.9?x
Ce
x
Sr0.1)Cu2O
z |
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Authors: | Hiroyuki Sasakura Yoshiya Akagi Shigeki Tsukui Motoaki Adachi |
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Affiliation: | (1) Department of Physics, Hamamatsu University School of Medicine, 1-20-1 Handayama, Hamamatsu, Shizuoka, 431-3192, Japan; |
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Abstract: | We previously reported on the discovery of new Pb-based 1222 cuprates containing boron in the (Pb0.5B0.5)Sr2(RE2−x−y
Ce
x
Sr
y
)Cu2O
z
(RE = Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, and Y) systems. However, none of the cuprates was a superconductor, but a semiconductor
with the conduction process of a three-dimensional variable range hopping at low temperatures, despite annealing under O2 atmosphere at 100 atm and 400 °C. Recently, we have discovered that some samples showed superconductivity in the (Pb0.5B0.5)Sr2(Y1.9−x
Ce
x
Sr0.1)Cu2O
z
system. Among them, the sample with x=0.45 shows the highest zero resistivity temperature at about 10 K and it shows a diamagnetic signal starting at abut 16 K
with lowering temperature. The superconductivity is considered to originate from the 1222 phase. |
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Keywords: | |
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