Journal ArticleDOI
Fluctuation induced excess conductivity in Tl2CaBa2Cu2O8
Raghavan Srinivasan,H. Krishnan,V. Sankaranarayanan,I. K. Gopalakrishnan,P.V.P.S.S. Sastry,J. V. Yakhmi,R.M. Iyer +6 more
TLDR
In this article, two samples of single phase thallium-calcium-barium-copperoxide were prepared using a precursor matrix technique and the resistivity of these samples was determined from 300 K to the temperature of zero resistance, Tzero, using the Montgomery technique.Abstract:
Two samples of single phase thallium-calcium-barium-copper-oxide were prepared using a precursor matrix technique. The resistivity of these samples was determined from 300 K to the temperature of zero resistance, Tzero, using the Montgomery technique. The room temperature resistivity of sample 2 was approximately seven times the room temperature resistivity of sample 1. From these measurements it was found that the temperature dependence of the fluctuation-induced excess conductivity in both the samples was in agreement with the Aslamazov-Larkin expression for three dimensional fluctuations.read more
Citations
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Effect of disorder on the exponent in the coherence region in high temperature superconductors
Manmeet Kaur,Raghavan Srinivasan,G.K. Mehta,D. Kanjilal,R. Pinto,Satishchandra Ogale,Sangeneni Mohan,V. Ganesan +7 more
TL;DR: In this article, the effect of disorder on the electrical resistance near the superconducting transition temperature in the paracoherence region of high temperature YBa 2 Cu 3 O 7− δ (YBCO) thin film superconductor is reported.
Journal ArticleDOI
Fluctuation induced excess conductivity in the Bi1.2Pb0.3Sr1.5Ca2Cu3Oy compound
S. Ravi,V. Seshu Bai +1 more
TL;DR: In this paper, the temperature variation of resistivity measured for the 110 K phase of the (Bi, Pb)-Sr-Ca-Cu-O system has been analyzed to study the excess conductivity due to fluctuations in the mean field region.
Journal ArticleDOI
Suppression of Superconductivity Due to Enhanced Co Doping in Cu0.5Tl0.5Ba2Ca2Cu3−yCoyO10−δ Superconductors
TL;DR: In this article, the authors used Aslamazov-Larkin (AL) and Lawrence-Donaich (LD) equations to analyze the fluctuation induced conductivity (FIC) of Co-doped Cu 0.5Tl0.5Ba2Ca2Cu3−y
Journal ArticleDOI
Electrical resistivity in polycrystalline La1.8Sr0.2CuO4 and YBa2Cu3O7-δ - temperature dependence and critical fluctuations
N. Sudhakar,M.K. Pillai,Argha Banerjee,Dhirendra Bahadur,Amitabh Das,K. P. Gupta,S. V. Sharma,A. K. Majumdar +7 more
TL;DR: In this paper, high resolution electrical resistivity data have been taken from 300 K down to zero-resistance temperatures in polycrystalline La 1.8 Sr 0.2 CuO 4 anf YBa 2 Cu 3 O 7−δ samples.
Journal ArticleDOI
Conductivity fluctuation in HBCCO superconductor
TL;DR: In this paper, the measured excess conductivity of a HBCCO high-T c superconductor as a function of temperature is attributed to the fluctuation of superconducting order parameter above T c 0, which is consistent with the two dimensional Aslamazov-Larkin mean-field theory based on the Ginzburg-Landau theory.
References
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Journal ArticleDOI
The influence of fluctuation pairing of electrons on the conductivity of normal metal
L.G. Aslamasov,A. I. Larkin +1 more
TL;DR: The theoretical analysis of the influence of the fluctuation pairing on the conductivity of a normal film leads to the law σ = σ res + e 2 (T−T c ) 16 d h T c in good agreement with experimental data as discussed by the authors.
Journal ArticleDOI
Method for Measuring Electrical Resistivity of Anisotropic Materials
TL;DR: In this paper, a rectangular prism with edges in principal crystal directions is prepared with electrodes on the corners of one face, and voltage-current ratios for opposite pairs of electrodes permit calculation of components of the resistivity tensor.
Journal ArticleDOI
Upper critical field, fluctuation conductivity, and dimensionality of YBa2Cu3O7-x.
Byungdu Oh,Kookrin Char,Andrew D. Kent,M. Naito,M. R. Beasley,T. H. Geballe,Robert Hammond,Aharon Kapitulnik,J. M. Graybeal +8 more
TL;DR: The upper critical field H/sub c//sub 2/ and fluctuation conductivity results demonstrate the intrinsic anisotropy in this layered superconductor and the dimensionality of the superconductivity in this material is discussed.
Journal ArticleDOI
Critical fluctuations in high-T c superconductors
TL;DR: The GinZburg criterion suggests that the Ginzburg-Landau theory will break down within --0.1 K of the transition temperature of the new high-T/sub c/ superconductors.
Journal ArticleDOI
Thermodynamic fluctuations in the superconductor Y 1 Ba 2 Cu 3 O 9 − δ : Evidence for three-dimensional superconductivity
TL;DR: The scaling of resistivity near and above the superconductivity transition temperature T/sub c/ observed in the Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 9-//sub delta/ superconductor, is found to be a manifestation of thermodynamic fluctuations as mentioned in this paper.