Maximum Josephson current and inhomogeneous superconductivity in Bi2Sr2CaCu2O8+δ

Suzuki, Minoru; Hamatani, Takashi; Yamada, Y.; Anagawa, Kenkichi; Watanabe, T.

doi:10.1088/1742-6596/43/1/270

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…It can be clearly seen that the carrier injection effect caused an increase of I c , while Δ s decreased with increased doping level. This increase of I c is in good agreement with our earlier study [30] and also with several studies in the literature indicating that the c-axis critical current density, J c , changes exponentially with the doping level or oxygen excess δ [31][32][33]. Moreover, we observe that the J c values that can be calculated from figure 8(b) lie in the range J c = (4.7-6.4) × 10 2 A cm −2 , which all fall into the underdoped regime [29].…”

Section: Resultssupporting

confidence: 93%

“…It can be clearly seen that the carrier injection effect caused an exponential increase at I c , while Δ s exponentially decreased with increasing the doping level. There are also several studies in the literature, which indicate that the c-axis critical current density, J c , changes exponentially with the doping level or oxygen excess δ [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Interlayer tunneling spectroscopy of mixed-phase BSCCO superconducting whiskers

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Truccato

Simsek

et al. 2016

Supercond. Sci. Technol.

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In this work, we present a study on the interlayer tunneling spectroscopy (ITS) of mixed-phase BiSrCaCuO (BSCCO) superconducting whiskers. The tunneling experiments were carried out on the artificial cross-whisker (twist angle of 90°) junctions. A multiple superconducting energy gap in the cross-whisker junctions was observed, which is attributed to the presence of different doping levels of two Bi2Sr2CaCu2O8+δ phases (Bi-2212), rather than two different phases, in the BSCCO whiskers, namely Bi2Sr2CaCu2O8+δ and Bi2Sr2Ca2Cu3O8+δ (Bi-2212 and Bi-2223). The temperature dependence of the energy gaps was discussed in the framework of the BCS T-dependence. On the other hand, the carrier concentration of the cross-whisker junction was changed by the carrier injection process. The effects of the carrier injection on the critical current, Ic, and the ITS of intrinsic Josephson junctions were investigated in details.

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Interlayer tunneling spectroscopy of mixed-phase BSCCO superconducting whiskers

Kızılaslan

Truccato

Simsek

et al. 2016

Supercond. Sci. Technol.

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“…In our previous ITS studies on Bi2212, we posited that such anomalous suppressions of J c result from inhomogeneous superconductivity. 34 The Josephson current flows only when both junction electrodes are in the superconducting (SC) state. When this is not the case, the junction is resistive and no Josephson current flows.…”

Section: Doping Dependence Of Josephson Critical Current Densitymentioning

confidence: 99%

Increase of superfluid density with growth of quasiparticle density of states probed by intrinsic tunneling spectroscopy in Bi1.9Pb0.1Sr
Kambara
¹
,
Kakeya
²
,
Suzuki
³

2013
Phys. Rev. B
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14
1
12
0
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Interlayer tunneling spectra, the Josephson critical current density J c , and the normal tunneling resistance have been measured simultaneously for intrinsic Josephson junctions of Bi 1.9 Pb 0.1 Sr 2 CaCu 2 O 8+δ (BiPb2212) in the underdoped region using a small mesa structure (S = 1 × 1 μm 2) and a short-pulse technique. J c was significantly enhanced when Bi was partially replaced with Pb. By comparing J c with the value estimated by the Ambegaokar-Baratoff formula, it was found that superfluid density doubles in the Pb-containing sample. In addition, Pb raises the superconducting coherence peak without changing the value of the superconducting gap. Based on a model that accounts for the inhomogeneity of in k space, we argue that the superfluid density increases because Pb substitution increases the homogeneity of (k).

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“…There is a rather limited number of studies in the literature that indicate that the critical current density j c changes exponentially with the doping level or oxygen excess δ [31,32]. However, these studies used different samples for different doping levels.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the critical current of intrinsic Josephson junctions by carrier injection

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Simsek

Aksan

et al. 2015

Supercond. Sci. Technol.

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We present a study of the doping effect by carrier injection of high-T c superconducting Bi-based whiskers. The current was injected in the c-axis direction, i.e., perpendicular to the superconducting planes. Superconducting properties were investigated systematically as a function of the doping level. The doping level of one and the same sample was changed by current injection in very small steps from an underdoped state up to a slightly overdoped state. We have observed that T c versus log (j c ) exhibits a dome-shaped characteristic, which can be fitted by a parabola. As T c versus carrier concentration has a parabolic form, too, it can be concluded that the critical current density j c increases exponentially with the doping level. The electron-trapping mechanism is interpreted in the framework of Phillips' microscopic theory. In addition, the Joule heating effect in the intrinsic Josephson junction (IJJ) was controlled by carrier injection, and the effect of the non-equilibrium quasiparticle on the I-V curves of the IJJs was also discussed.

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Maximum Josephson current and inhomogeneous superconductivity in Bi₂Sr₂CaCu₂O_8+δ

Cited by 5 publications

References 8 publications

Interlayer tunneling spectroscopy of mixed-phase BSCCO superconducting whiskers

Interlayer tunneling spectroscopy of mixed-phase BSCCO superconducting whiskers

Increase of superfluid density with growth of quasiparticle density of states probed by intrinsic tunneling spectroscopy in Bi1.9Pb0.1Sr
Kambara
¹
,
Kakeya
²
,
Suzuki
³

2013
Phys. Rev. B
Self Cite
14
1
12
0
View full text Add to dashboard Cite

Enhancement of the critical current of intrinsic Josephson junctions by carrier injection

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Maximum Josephson current and inhomogeneous superconductivity in Bi2Sr2CaCu2O8+δ

Cited by 5 publications

References 8 publications

Interlayer tunneling spectroscopy of mixed-phase BSCCO superconducting whiskers

Interlayer tunneling spectroscopy of mixed-phase BSCCO superconducting whiskers

Increase of superfluid density with growth of quasiparticle density of states probed by intrinsic tunneling spectroscopy in Bi1.9Pb0.1SrKambara1, Kakeya2, Suzuki3 2013Phys. Rev. BSelf Cite141120View full textAdd to dashboardCite

Enhancement of the critical current of intrinsic Josephson junctions by carrier injection

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Product

Resources

About

Maximum Josephson current and inhomogeneous superconductivity in Bi₂Sr₂CaCu₂O_8+δ

Increase of superfluid density with growth of quasiparticle density of states probed by intrinsic tunneling spectroscopy in Bi1.9Pb0.1Sr
Kambara
¹
,
Kakeya
²
,
Suzuki
³

2013
Phys. Rev. B
Self Cite
14
1
12
0
View full text Add to dashboard Cite