Armenian Journal of Physics

CORRELATION BETWEEN CRYSTAL STRUCTURE AND RESISTIVITY OF HIGH-TEMPERATURE SUPERCONDUCTING CUPRATES

Roeser, H.P. and Bohr, A. and Haslam, D.T. and Lόpez, J.S. and Stepper, M. and Hube, F.M. and Nikoghosyan, A.S. (2011) CORRELATION BETWEEN CRYSTAL STRUCTURE AND RESISTIVITY OF HIGH-TEMPERATURE SUPERCONDUCTING CUPRATES. Armenian Journal of Physics, 4 (2). pp. 109-133. ISSN 1829-1171

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Abstract

The experimental resistivity of high-temperature superconducting (HTSC) cuprates at about Tc has been determined by many authors. For large devices the in-CuO2-plane resistivity has a range of ~0.5<r(exp)<1.5*10^-6 Ω m. Above Tc all HTSC materials behave like a classical device and the resistance depends on cross section and length of the device. Assuming a superconducting unit volume and a mode structure, which are given by the doping pattern throughout the whole crystal, the experimental resistivity values have been plotted versus ~LR/Nmode. A strong linear correlation in the form r(exp)=m3*(LR/Nmode)*(n4/n3)can be seen with a slope of m3=(13.39+_0.79)*10^3 Ω. LR is an effective resistivity length, Nmode is the number of CuO2 planes per unit cell, n3 is the number of Cu3+-ions per chemical formula and n4 is the number of different shifted stacking sequences per unit cell. The investigation has only been performed for a maximum of Nmode=4 modes. The value for m3 is very close to the fundamental resistance of a single-mode ballistic conductor Rsm=h/2e^2=12.906 Ω, which appears when size quantization plays a dominant role.

Item Type:Article
Subjects:Physics > 74.Superconductivity
ID Code:382
Deposited By:Prof. Vladimir Aroutiounian
Deposited On:28 Sep 2011 13:15
Last Modified:18 Oct 2011 12:53

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