Excess electrical conductivity in polycrystalline Bi-Ca-Sr-Cu-O compounds and thermodynamic fluctuations of the amplitude of the superconducting order parameter

Vidal, F.; Viera, Jarek; Maza, J.; Ponte, J. J.; Garcı́a-Alvarado, F.; Morán, E.; Amador, Juan Antonio; Cascales, C.; Castro, A.; Casáis, M. T.; Rasines, I.

doi:10.1016/0921-4534(88)90166-9

Cited by 84 publications

(25 citation statements)

References 27 publications

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“…Therefore, the fluctuations in the order parameter or the superconducting fluctuation behaviour (SFB) of gadolinium-substituted BPSCCO specimens has a 2D dimensionality. This result is in agreement with the previous reportings on BSCCO system [5][6][7][8]. However, the cross-over reported in ref.…”

Section: Superconducting Fluctuation Behaviour (Sfb) Studiessupporting

confidence: 49%

“…Previous reports suggest 2D superconducting fluctuation behaviour (SFB) in BSCCO (2212) system [5] and BSCCO (2223) system [5,6]. Other researchers [7,8] have also confirmed 2D superconducting fluctuation behaviour in BSCCO system.…”

Section: Introductionmentioning

confidence: 59%

“…The analysis of SFB in Δσ analysis for single crystal BSCCO (2212) system [9] however, shows a distinct 2D-3D cross-over. These studies [5][6][7][8][9] however, do not discuss the effect of substitution on superconducting fluctuation behaviour (SFB) in BSCCO systems. This paper summarises the effect of gadolinium doping at calcium site on the normal and superconducting properties of BPSCCO (2223) system.…”

Section: Introductionmentioning

confidence: 99%

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Gd-substituted Bi-2223 superconductor

Mishra

2008

Pramana - J Phys

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Abstract. The effects of gadolinium doping at calcium site on the normal and superconducting properties of Bi-2223 system were studied. The Gd-doped (BiPb)-2223 series of specimens, namely Batch I, II and III were sintered at three different sintering temperatures 830, 850 and 895• C respectively. The properties investigated are (1) the normal state resistivity with a view to study metal-to-insulator transition, (2) the XRD patterns of the specimens with a view to study the relative composition of (BiPb)-2212 and (BiPb)-2223 phases and (3) the superconducting fluctuation behaviour (SFB) with a view to determine the effect of doping, if any, on the dimensionality of the fluctuation conductivity of the system. The normal state resistivity of Gd-substituted Bi-2223 specimens shows metallic, semiconducting and insulating behaviour. The Tc(R = 0) values indicate that (BiPb)-2223 phase is responsible for the observed superconducting transitions in Batch I and Batch II specimens with Gd concentrations x ≤ 0.7. This observation is further confirmed in the analysis of XRD patterns of these specimens. Gadolinium, being a magnetic impurity, has pair breaking effect near the Fermi level and decreases Tc(R = 0). The analysis of the superconducting fluctuation behaviour (SFB) shows a 2D dimensionality without any cross-over.

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Section: Superconducting Fluctuation Behaviour (Sfb) Studiessupporting

confidence: 49%

Section: Introductionmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

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Gd-substituted Bi-2223 superconductor

Mishra

2008

Pramana - J Phys

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“…In the case of bismuth based superconductors the dimensional behaviour depends mainly on their stoichiometry. For Bi 2212 superconductors there is practically two-dimensional system [15], whereas for Bi 2223 superconductors some authors [16] nd two-dimensional behaviour while others [17] propose the crossover from 2D to 3D uctuations. Our current study of bulk Bi 2223…”

Section: Resultsmentioning

confidence: 99%

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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“…According to Pogrebnyakov et al [14] the dominance of 3D fluctuations, or 2D-3D cross-over depended on the range of temperature. For single crys- [15,16]. On the other hand, Friedman et al [17] reported that the LawrenceDoniach theory gives the best fit to their data showing 2D-3D cross-over at T 0 = 91.1 K but T mf c lies below T c including unreasonably small value of coherence length.…”

Section: Introductionmentioning

confidence: 93%