In-plane optical spectra of Y_(1-x)Ca_xBa_2Cu_3O_(7-δ): Overdoping and disorder effects on residual conductivity

E. Uykur; K. Tanaka; T. Masui; S. Miyasaka; S. Tajima

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In-plane optical spectra of Y_(1-x)Ca_xBa_2Cu_3O_(7-δ): Overdoping and disorder effects on residual conductivity

机译：Y_（1-x）Ca_xBa_2Cu_3O_（7-δ）的面内光谱：掺杂和无序对残余电导率的影响

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We measured the temperature dependence of the in-plane polarized reflectivity spectra of twin-free Y_(1-x)Ca_xBa_2Cu_3O_(7-δ) single crystals with different Ca concentrations (x = 0, 0.11.and 0. 16) from the optimally doped to heavily overdoped region. Low-energy optical conductivity spectra showed a Drude-like residual conductivity at temperatures far below the superconducting transition temperature, which indicates the presence of unpaired-normal carriers in the superconducting state. Comparing the spectra at a fixed Ca content or at a fixed doping level, we have revealed that the carrier overdoping increases unpaired carriers in addition to those induced by the Ca disorder. We also found the superconducting behavior of the one-dimensional CuO chains for the Ca-free samples.

机译：我们从最佳位置测量了具有不同Ca浓度（x = 0、0.11和0. 16）的无孪晶Y_（1-x）Ca_xBa_2Cu_3O_（7-δ）单晶的面内偏振反射光谱的温度依赖性。掺杂到严重过量的区域。低能光导谱在远低于超导转变温度的温度下显示出类似于Drude的残留电导率，这表明在超导状态下存在未配对的正态载流子。比较固定Ca含量或固定掺杂水平下的光谱，我们发现载流子过量掺杂会增加由Ca紊乱引起的未配对载流子。我们还发现了无钙样品的一维CuO链的超导行为。

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来源
《Physical review》 |2011年第18期|p.184527.1-184527.7|共7页
作者
E. Uykur; K. Tanaka; T. Masui; S. Miyasaka; S. Tajima;
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Department of Physics, Graduate School of Science, Osaka University, Osaka 560-0043, Japan;

Department of Physics, Graduate School of Science, Osaka University, Osaka 560-0043, Japan;

Department of Physics, Graduate School of Science, Osaka University, Osaka 560-0043, Japan;

Department of Physics, Graduate School of Science, Osaka University, Osaka 560-0043, Japan;

Department of Physics, Graduate School of Science, Osaka University, Osaka 560-0043, Japan;

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正文语种 eng
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optical properties; cuprate superconductors (high-Tc and insulating parent compounds);

机译：光学性质铜酸盐超导体（高Tc和绝缘母体化合物）;

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2. Electronic Raman Response of Optimal and Overdoped Y_(1-x)Ca_xBa_2Cu_3O_(7-#delta#) Single Crystals [J] . A. A. Martin, V. G. Hadjiev, C. Bernhard, Physica status solidi, B. Basic research . 1999,第2期

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机译：系统研究金属取代对YBa2Cu（1-x）mx3O（7-（Rho）），m = Fe，Co，al，Ga，Cr，Ni和Zn中Cu的影响。

In-plane optical spectra of Y_(1-x)Ca_xBa_2Cu_3O_(7-δ): Overdoping and disorder effects on residual conductivity

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