T C Decrease Under Copper Substitution by Metallic Ions in LSCO and YBCO Cuprates

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• 作者：Andreea Oprea
• 关键词：Cuprates ; Hightemperature superconductivity ; Copper substitution ; Effective hubbard model
• 刊名：Journal of Superconductivity Incorporating Novel Magnetism
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：28
• 期：2
• 页码：503-508
• 全文大小：477 KB
• 参考文献：1. Hamming, R.W.: Numerical methods for scientists and engineers, 2nd edn. New York: Dover, Part II, Chap 27 (1986)
  2. Adam, Gh., Adam, S., Ayriyan, A., Dushanov, E., Hayryan, E., Korenkov, V., Lutsenko, A., Mitsyn, V., Sapozhnikova, T., Sapoznikov, A., Streltsova, O., Buzatu, F., Dulea, M., Vasile, I., Sima, A., Visan, C., Busa, J., Pokorny, I.: Performance assessment of the SIMFAP parallel cluster at IFIN-HH Bucharest. Rom. Journ. Phys. class="a-plus-plus">53, 665-77 (2008)
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  5. Padaliat, B.D., Gurman, S.J., Mehta, P. K.: Prakash Om.: Extended x-ray absorption fine-structure studies of 3d ions in YBa_{class="a-plus-plus">2}(Cu_{class="a-plus-plus">1?em class="a-plus-plus">x} M_{class="a-plus-plus"> / x} )_{class="a-plus-plus">3}O_{class="a-plus-plus">7?em class="a-plus-plus">δ} ( / x ?0.10; M ?Mn, Fe, Co, Ni and Zn). J. Phys.: Condens. Matter. class="a-plus-plus">4, 6865-878 (1992)
  6. Rao, A., Rao, A.: Influence of Zn doping on the thermal expansion of the high / T _{class="a-plus-plus">C} superconductor Y_{class="a-plus-plus">1}Ba_{class="a-plus-plus">2}Cu_{class="a-plus-plus">3}O_{class="a-plus-plus"> / y} . J. Phys.: Condens. Matter. class="a-plus-plus">16, 1439-445 (2004)
  7. Soerensen, G., Gygax, S.: Evaluation of oxygen isotope experiments on Pr-, Ca-, and Zn-substituted YBa_{class="a-plus-plus">2}Cu_{class="a-plus-plus">3}O_{class="a-plus-plus">7}. Phys. Rev. B class="a-plus-plus">51, 11848-1859 (1995) class="external" href="http://dx.doi.org/10.1103/PhysRevB.51.11848" target="_blank" title="It opens in new window">CrossRef
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  10. Licci, F., Raffo, L.: Interplay of electronic and structural features in Zn- and Fe-doped YBCO. Supercond. Sci. Technol. class="a-plus-plus">8, 245-51 (1995) class="external" href="http://dx.doi.org/10.1088/0953-2048/8/4/009" target="_blank" title="It opens in new window">CrossRef
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  13. Westerholt, K., Wuller, H.J., Bach, H., Stauche, P.: Influence of Ni, Fe, and Zn substitution on the superconducting and antiferromagnetic state of YBa_{class="a-plus-plus">2}Cu_{class="a-plus-plus">3}O_{class="a-plus-plus">7?em class="a-plus-plus">δ} . Phys. Rev. B class="a-plus-plus">39, 11680-1689 (1989) class="external" href="http://dx.doi.org/10.1103/PhysRevB.39.11680" target="_blank" title="It opens in new window">CrossRef
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• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Superconductivity, Superfluidity and Quantum Fluids
  Magnetism and Magnetic Materials
  Condensed Matter
  Characterization and Evaluation Materials
  
• 出版者：Springer New York
• ISSN：1557-1947

文摘

Experimental evidence reported by various authors concerning the dependence of T C on the y percentage of metal (M) ions in (La1.85Sr0.15Cu1?em class="a-plus-plus">y M y O4) (LSCMO) and (YBa2(Cu1?em class="a-plus-plus">y M y )3O7?em class="a-plus-plus">δ ) (YBCMO, where δ = 0.07 ± 0.03) cuprates under Cu2+ substitution by M ions is scrutinized. The collected data represent a preliminary report on the selective Cu2+ substitutions by various metal ions of ionic radii close to that of Cu2+ in optimally doped La2?em class="a-plus-plus">x Sr x CuO4 (LSCO) and YBa2Cu3O y (YBCO) cuprates. Each T C(y i ) set of values for each y i concentration of M ion was replaced by a unique value T C(y i ) obtained as the arithmetic average of the data reported in the literature at various cooper substitution levels y i by a specific M ion in a given cuprate. The data analysis of the uniquely resulting T C(y i ) distributions for different M ions was performed by least squares fit (LSQF) analysis using the Hamming termination criterion which assumes Hamming (1986) that the optimal degree of the fitting polynomial is reached when the distribution of the residuals gets stochastic (for implementation details, see Adam et al., Rom. Journ. Phys. 53:665-77, 2008). The accumulated experimental evidence probing the sharp decrease of the transition temperature T C under gradual substitutions of the in-plane Cu2+ ions by M ions is strong arguments in favor of the effective two-dimensional two-band Hubbard model (see Plakida and Oudovenko, Europ. Phys. J. B. 86:115-30, 2013) and references therein), which starts from the fundamental assumption that the high-temperature superconductivity in cuprates originates in the interactions occurring inside the individual CuO2 planes of the existing layered perovskite structures. The results substantiate the key role of the CuO2 planes as a source of the high T C superconductivity in cuprates.