The change of anisotropy by Zn or Ca substitution in YBCO single crystals
Takahiko Masui; Yuta Uraike; Kouta Nagasao; Setsuko Tajima; Takahiko Masui; Department of Physics, Graduate School of Science, Osaka University, Osaka 560–0043, Japan; Yuta Uraike; Department of Physics, Graduate School of Science, Osaka University, Osaka 560–0043, Japan; Kouta Nagasao; Department of Physics, Graduate School of Science, Osaka University, Osaka 560–0043, Japan; Setsuko Tajima; Department of Physics, Graduate School of Science, Osaka University, Osaka 560–0043, Japan
Журнал:
Journal of Physics: Conference Series
Дата:
2009-03-01
Аннотация:
Zn and Ca substitution effects in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> single crystals are presented, focusing on the anisotropy in overdoped regime. Overdoping by Ca substitution lowers the pseudogap temperature T*, T* vanishes for heavily overdoped samples. The effect of oxygen deficiency by Ca-substitution is negligible. Zn substitution effect on residual part of c-axis resistivity is hardly observed, which is in contrast to the steady increase for in-plane resistivities.
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