Fluctuation conductivity at high temperatures in polycrystalline Hg, Tl-1223––Is there 1D fluctuation behavior?

Han, Song; Axnäs, Johan; Zhao, Bo-Wei; Rapp, Ö.

doi:10.1016/j.physc.2004.03.107

Cited by 43 publications

(27 citation statements)

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“…The similar crossover was observed in the polycrystalline (Hg,Tl) 1223 superconductors and described in paper [10]. The authors contended that the appearance of 1D uctuating system suggests the existence of conducting channels in the superconductors.…”

Section: Resultssupporting

confidence: 71%

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Thermal Fluctuations of Bismuth Based 1G Tape

et al. 2015

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The thermal uctuations of bismuth based commercial 1G tape were studied near the critical temperature Tc = 110.2 K. The detailed analysis of the temperature dependence of resistivity measurements was made in the temperature region from the zero resistance critical temperature up to 300 K. The thermal uctuations of conductivity were analysed using the AslamazovLarkin microscopic approach and the critical exponents were calculated close to the transition temperature.

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Section: Resultssupporting

confidence: 71%

“…There are also observed the crossover from 2D to 1D in Hg-Tl 1223 polycrystalline superconductor [10]. In this paper the thermal uctuations of the 1G commercial BSCCO tape in the superconducting transition were studied.…”

Section: Introductionmentioning

confidence: 96%

Thermal Fluctuations of Bismuth Based 1G Tape

et al. 2015

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“…This concerns the ceramics, single crystals as well as the thin film samples [23][24][25][26]. A crossover from 2D to 1D was also reported for Hg-Tl 1223 ceramic superconductor [27]. The excess conductivity of the lower-dimensionality superconductors could successfully be described by the theory [28], which predicts λ = 1 for the two-dimensional and λ = 1.5 for the one-dimensional case in (1).…”

Section: Resultsmentioning

confidence: 65%

“…Below the critical temperature, the susceptibility signal is mainly related to the grain interiors, so the respective Cooper pair fluctuations are related to the intragranular regions. As described in several papers [5,27,34,35], the critical exponents bigger than 1.5 do not find reliable theoretical explanations. In several works [36][37][38], one can find suggestions that such high values of critical exponents are related to the properties of the Josephson junction.…”

Section: Resultsmentioning

confidence: 88%

Electrical Conductivity and Magnetic Susceptibility of Thallium 1223-Based Superconductor in the Fluctuation Range

Woch

Zalecki

Giebułtowski

et al. 2018

J Supercond Nov Magn

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The paper reports on the temperature dependencies of the electrical resistivity and the a.c. magnetic susceptibility of the Tl 0.8 Bi 0.3 Sr 1.8 Ba 0.2 Ca 2 Cu 3 O x bulk superconductor measured in the area of the transition from the metallic to the superconducting state. From the resistivity data, the onset temperature T c,onset = 121.6 K, the critical temperature T c50% = 118.8 K, the zero resistance critical temperature obtained using E = 10 −6 V/cm criterion T c0 = 117.9 K, and the width of superconducting transition T = 1.6 K were derived. The thermal fluctuations were examined using the formulae for the conductance: σ = Kε −λ , and for the magnetic susceptibility:λ is the critical exponent, and K and C are constants. The critical exponents in the transition region from the normal to the superconducting state were determined and analyzed. The three-dimensional fluctuations were found to occur in the vicinity of the zero-resistance critical temperature.

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“…The high values of the critical exponents near the zero resistance critical temperature suggest that the uctuating Cooper pairs are forced to move along the one dimension percolation path. This idea was proposed in the paper [39] in which the crossover from 2D to 1D in the polycrystalline HgTl 1223 superconductors was observed. On the other hand the crossover from 2D to 3D dimensional uctuation in the polycrystalline HgTl 1223 superconductors was also noticed [40].…”

Section: Thermal Uctuationsmentioning

confidence: 99%