Excess Conductivity Analysis of Tl1?em class="a-plus-plus">x Y x Ba2Ca2Cu _{详细信息    查看全文}

• 作者：Nawazish A. Khan (1)
  Saleem Abbas (1)
  Syed M. Husnain Gardezi (2)
  
• 关键词：Y ; doped Tl1?x Y x Ba2Ca2Cu3O10?δsuperconductors ; Fermi velocity of the carriers ; Shrunken width 2D conductivity by Y doping
• 刊名：Journal of Low Temperature Physics
• 出版年：2013
• 出版时间：2 - July 2013
• 年：2013
• 卷：172
• 期：1
• 页码：70-83
• 全文大小：648KB
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• 作者单位：Nawazish A. Khan (1)
  Saleem Abbas (1)
  Syed M. Husnain Gardezi (2)
  
  1. Materials Science Laboratory, Department of Physics, Quaid-i-Azam University, Islamabad, 45320, Pakistan
  2. Department of General Studies (Physics), Yanbu University College, Yanbu Industrial City, P.B. Box: 31387, Kingdom of Saudi Arabia
  
• ISSN：1573-7357

文摘

Excess conductivity analyses of resistivity data of Tl1?em class="a-plus-plus">x Y x Ba2Ca2Cu3O10?em class="a-plus-plus">δ (x=0, 0.04, 0.06, 0.08, 0.1) samples have been carried out by following Lawrence & Doniach (LD) and Maki-Thompson (MT) models. In the critical regime important superconductivity parameters have been elucidated by employing Ginzburg-Landau number N G of Ginzburg Landau theory. Our samples have shown a decrease in the T c (R=0) and magnitude of diamagnetism with increased Y-doping. The cell parameters and volume of the unit cell increase with doping of Y+3 in Tl1?em class="a-plus-plus">x Y x Ba2Ca2Cu3O10?em class="a-plus-plus">δ (x=0, 0.04, 0.06, 0.08, 0.1) which shows a decrease in the density of charge carriers in the conducting CuO2 planes. Since the Fermi vectors of the carriers, K F=[3π 2 N/V]1/3=[3π 2 n]1/3, their coherence length along the c-axis, ξ c=?K F/2mΔ, and the Fermi velocity, V F=?K F/m depend on density of mobile charge carriers, the doping of Y+3 suppresses it and hence the superconductivity parameters. We have confirmed these conjectures with the excess conductivity analyses (FIC) of our conductivity data. The FIC analysis of conductivity data has shown a decrease in the values of ξ c, V F, B c(0), B c1(0) and J c(0) with increase doping of Y (except for the samples with x=0.04). The width of two dimensional conductivity regimes is shrunken with increased Y-doping. From these studies it is concluded that presence of Y+3 in the unit cell of TlBa2Ca2Cu3O10?em class="a-plus-plus">δ impedes the flow of the mobile charge carriers to the conducting CuO2 planes which induce suppression in the superconductivity parameters. The studies also stress the vital role of mobile charge carriers in the mechanism of high temperature superconductivity.