Superconducting fluctuation in Bi2Sr2Ca2Cu3Ox

Schnelle, Walter; Braun, E.; Broicher, H.; Weiß, H.; Geus, H.; Ruppel, S.; Galffy, M.; Braunisch, W.; Waldorf, A.; Seidler, F.; Wohlleben, D.

doi:10.1016/0921-4534(89)90120-2

Cited by 72 publications

(21 citation statements)

References 28 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: 48%

“…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: 48%

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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“…Nevertheless several experimental groups independently find coinciding results [29,30] which gives us a certain confidence in them.…”

Section: Specific Heat Anomaly In Htc Scmentioning

confidence: 83%

The Polaron Scenario for High-T_cSuperconductivity

Ranninger¹

1994

Acta Phys. Pol. A

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On the basis of experimental evidence we conclude that high-T c superconducting materials are composed of two distinct subsystems: one in which electrons are bound together in form of localized pairs of small polarons (bipolarons) and one in which electrons exist as strongly correlated Fermions. Upon doping one passes at a critical doping rate from the insulating parent compounds to metallic compounds. There, a charge transfer mechanism between the two subsystems sets in abruptly by which bipolarons can decay into pairs of electrons and vice versa. Such a picture can be modelled by a mixture of interacting Bosons and Fermions. A superconducting ground state for such a system develops at low temperature which is characterized by the opening of a gap in the single electron spectrum and the appearance of collective Boson excitations with a linear spectrum which is confined to the energy regime of the gap. Above TT , a pseudo-gap remains upon closing the superconducting gap. There are strong indications that the normal state has non Fermi liquid behaviour.

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“…The electronic specific heat coefficients 7, and the coherence length Ę have been obtained. The specific heat anomaly, especially the specific heat jump AC at the superconducting transition temperature Tc in high-temperature superconductors (HTSC) of yttrium, thalium and bismuth families have been thorougly investigated in view to look at the discrepancy between BCS-like and fluctuations-added-like behavior [1][2][3]. The classical BCS-Ginzburg-Landau (BCS-GL) approach [4] neglects any fluctuations because according to the so-called Ginzburg criterion [4,5], the temperature interval around Tc , in which this theory collapses, is extremally narrow for conventional superconductors.…”

Section: G Gritzner and M Mairmentioning

confidence: 99%

Specific Heat and Magnetoresistance of Y-, Tl- and Bi-Type High-Temperature Superconductors

et al. 1997

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Specificheat of polycrystalline DyBa2Cu3O 7 and Tl0.58Pb0,42Sr1.6Ba0.4Ca2Cu3O9 samples, as well as the single crystal of Bi2Sr2CaCu2O8 have been measured within the temperature interval from 50 to 250 K. For Dy-and Tl-specimens the pronounced jump in specific heat and apparent contribution from Gaussian fluctuations of superconducting order parameter close to T, have been observed. In contrary, for Bi-specimen only a rounded maximum within a broad interval around Tc has been detected. Magnetoresistance measurements as a function of temperature just below T, have been carried out for Dy-and Tl-samples and the slopes of upper critical fields have been determined. The data have been analysed within a frame of Ginzburg-Landau-Abrikosov-Gorkov theory with additional Gaussian-like fluctuation term. The electronic specific heat coefficients 7, and the coherence length Ę have been obtained. The specific heat anomaly, especially the specific heat jump AC at the superconducting transition temperature Tc in high-temperature superconductors (HTSC) of yttrium, thalium and bismuth families have been thorougly investigated in view to look at the discrepancy between BCS-like and fluctuations-added-like behavior [1][2][3]. The classical BCS-Ginzburg-Landau (BCS-GL) approach [4] neglects any fluctuations because according to the so-called Ginzburg criterion [4,5], the temperature interval around Tc , in which this theory collapses, is extremally narrow for conventional superconductors. In Eq. (1) Tc , Hc , have their usual meaning, Hc (T) = Hc2(T)2 -1 /2 #c G L, and the so-called G-L parameter κGL is the ratio of the penetration depth λGL to the coherence length ξGL. On the contrary, for the HTSC, the temperature interval is of the order of 0.1-1 K [5, 6], mainly due (431)

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Superconducting fluctuation in Bi2Sr2Ca2Cu3Ox

Cited by 72 publications

References 28 publications

Gd-substituted Bi-2223 superconductor

Gd-substituted Bi-2223 superconductor

The Polaron Scenario for High-T_cSuperconductivity

Specific Heat and Magnetoresistance of Y-, Tl- and Bi-Type High-Temperature Superconductors

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Superconducting fluctuation in Bi2Sr2Ca2Cu3Ox

Cited by 72 publications

References 28 publications

Gd-substituted Bi-2223 superconductor

Gd-substituted Bi-2223 superconductor

The Polaron Scenario for High-TcSuperconductivity

Specific Heat and Magnetoresistance of Y-, Tl- and Bi-Type High-Temperature Superconductors

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The Polaron Scenario for High-T_cSuperconductivity