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Codoping Effect of Zn and Pr in YBa_2Cu_3O_{7-δ}

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Naik M., Sarode P., Prabhu R., Priolkar K., Vasanthacharya N.

Acta Physica Polonica A

2009

vol. 115

issue 3

742-744

In this paper we present the resistivity data for Pr and Zn codoped compound Y_{1-x}Pr_xBa_2[Cu_{1- y}Zn_y]_3O_{7-δ} with 0 & y & 0.1 and x=0.0, 0.1 and 0.2. The data is analysed in terms of the superconducting critical temperature T_c, residual resistivity ρ_0 and the resistivity slope dρ/dT corresponding to the linear ρ-T region. It is found that for x=0.1 Pr has a minimal influence on the in-plane processes for Zn impurity alone affecting slightly T_c and ρ_0. The slope dρ/dT becomes larger for 0.03 & y & 0.06 leading to larger depining effect and hence slower fall of T_c as a function of y. For x = 0.2 there is a drastic change, ρ_0 becomes abnormally large, dρ/dT becomes negative implying absence of depinning and a totally pinned charge stripes. Superconductivity vanishes at y=0.03. It is concluded that for x = 0.2 Pr converts the system from overdoped to underdoped region leading to the universal superconductor-insulator transition.

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1 Acta Physica Polonica A

1 2009

1 Naik M.

1 Prabhu R.

1 Priolkar K.

1 Sarode P.

1 Vasanthacharya N.

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Codoping Effect of Zn and Pr in YBa_2Cu_3O_{7-δ}