Terahertz emission from a stack of intrinsic Josephson junctions in Pb-doped Bi2Sr2CaCu2O8+δ

Tsujimoto, Manabu; Maeda, Yoshihito; Kambara, Hitoshi; Elarabi, Asem; Yoshioka, Yusuke; Nakagawa, Yasuyoshi; Wen, Yongzheng; Doi, Takuji; Saitô, Hiroshi; Kakeya, Itsuhiro

doi:10.1088/0953-2048/28/10/105015

Cited by 17 publications

(10 citation statements)

References 28 publications

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“…The corresponding current densities are about 220 A/cm 2 . Although this value is higher than switching current densities reported earlier [25,28,32,69,70] the fact that the switching current is nearly temperature independent over a large range of bath temperatures suggests that the actual critical current I c and the corresponding current density j c must be much higher. For slightly overdoped samples, measurements on small IJJ stacks revealed j c of at least 2 kA/cm 2 at 4.2 K, which would correspond to a critical current of 0.8 A for our stack [75].…”

Section: Sample Preparation and Measurement Techniquescontrasting

confidence: 57%

“…Subsequently, stacks sandwiched between two thermally-well-conducting substrates were created for a more efficient heat exhaust, and the highest emission frequency was increased gradually [25][26][27]. In addition, Tsujimoto et al [32] observed an increase of the maximum emission frequency for Pb-doped BSCCO stacks and argued that the higher interlayer critical current density j c leads to an increase of the Josephson plasma frequency, which most likely determines the cutoff frequency of emission. However, for high operating temperatures above 70 K, the reported BSCCO terahertz emitters always either have no emission or radiate at a frequency well below 500 GHz [25][26][27]29,35], limiting their applicability.…”

Section: Introductionmentioning

confidence: 99%

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Compact High- Tc Superconducting Terahertz emitter operating up to 86 K

Sun

Wieland

et al. 2018

Phys. Rev. Applied

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We report on a Stirling-cooled compact Bi 2 Sr 2 CaCu 2 O 8+δ intrinsic Josephson-junction stack with very high critical current density and improved cooling, operating at bath temperatures T b up to 86 K. The square stand-alone stack is embedded between two sapphire substrates. For bath temperatures between 27.8 and 86 K emission is observed at frequencies from 0.356 to 2.09 THz. The emission power exceeds 1 μW at bath temperatures between 60 and 80 K for emission frequencies between 0.5 and 0.88 THz. A record high value of 0.577 THz is obtained for the emission frequency at T b = 80 K, which is important for potential applications using liquid nitrogen as a coolant. We also compare our experimental results with numerical simulations based on three-dimensional coupled sine-Gordon equations combined with heat diffusion equations.

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Section: Sample Preparation and Measurement Techniquescontrasting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Compact High- Tc Superconducting Terahertz emitter operating up to 86 K

Sun

Wieland

et al. 2018

Phys. Rev. Applied

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“…A solid line represents fe ∝ √ Jc. Data correspondences are A07 [29], A11 [104], I12 [91], I13 [113], K15-1 [105], K15-2 [114], N10 [94], N12 [87], N14 [32], T09 [89], T12-1 [96], T12-2 [86], T14 [110], T15-1 [33], and T15-2 [34]. specific device.…”

Section: Suitable Materialsmentioning

confidence: 99%

Terahertz-wave emission from Bi2212 intrinsic Josephson junctions: a review on recent progress

Kakeya

Wang

2016

Supercond. Sci. Technol.

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Emission of terahertz (THz) electromagnetic (EM) waves from a high critical temperature (Tc) superconductor intrinsic Josephson junction (IJJ) is a new and promising candidate for practical applications of superconducting devices. From the engineering viewpoint, the IJJ THz source is competitive against the present semiconducting THz sources such as quantum cascade lasers and resonance tunnelling diode oscillators because of its broad tunable frequency range and ease of the fabrication process for the device. The emitted EM waves are considered to be coherent because the emission is yielded by synchronisation of thousand stacked IJJs consisting of the mesa device. This synchronisation is peculiar: the resonant frequency of each IJJ is distributed because the cross section of the mesa device is trapezoidal in shape. One of the key features of the synchronisation mechanism is the temperature inhomogeneity of the emitting device. In this topical review, we describe the recent progress in studies of IJJ THz sources with particular emphasis on the relevance of the temperature inhomogeneity to the synchronisation and the emission intensity. This review is of specific interest because the IJJ THz source shows the rich variety of functions due to self-heating which has always been a detrimental feature in the present superconducting devices. Moreover, the thermal managements used for IJJ THz sources will be common with those of other semiconducting devices such as quantum cascade lasers. In addition, this review is to invite the readers into related research through the detailed descriptions of experimental procedures.

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“…The most typical Bi-based cuprate superconductors are Bi2201 (n = 1, Michel et al 1987), Bi2212 (n = 2, von Schnering et al 1988), and Bi2223 (n = 3, Takano et al 1988), whose critical transition temperature (T c ) can arrive at 20 K, 90 K, and 110 K, respectively [5][6][7]. Therein, Bi2212 superconductor is expected to be applied in terahertz technology due to its intrinsic Josephson effect and excellent performance owing to its excellent service behavior at low temperature in strong magnetic field [8][9][10]. In addition, since Bi2212 superconducting tapes, wires, and films have been utilized widely in superconductivity and related fields, they have attracted great attention from the academics and industry [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Bi2Sr2CaCu2O8+δ(Bi2212) superconductor by Pechini sol–gel method: thermal decomposition and phase formation kinetics of the precursors

Zhao

Wang

et al. 2020

J Mater Sci: Mater Electron

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Bi2212 high-temperature superconductors were prepared using Pechini sol-gel method, and the thermal decomposition process under air condition was obtained by synchronous thermal analyzer. The synthesis mechanisms of Bi2212 phase were determined by the combination of universal integral, differential and multi-rate scanning methods. The crystallization behavior, morphology, and superconductivity of the samples were characterized and analyzed by XRD, FESEM, PPMS, and SQUID, respectively. The results exhibited that the thermal decomposition reactions of the precursors were divided into three stages. The kinetics of Bi2212 synthesis reaction followed the mechanism mode of random nucleation and subsequent growth (n = 3) during the third stage which were used to guide the heat treatment of the final products. The average activation energy and the pre-finger factor of the synthesis reaction were 226 kJ/mol and 1.84 9 10 11 /min, respectively. Finally, the Bi2212 superconductor with high purity and acceptable performance with the T c, onset of 77.1 K, T c, zero of 63.5 K, and the J c of 5.94 9 10 4 A/cm 2 , respectively, were prepared with shorter sintering time.

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Terahertz emission from a stack of intrinsic Josephson junctions in Pb-doped Bi₂Sr₂CaCu₂O_8+δ

Cited by 17 publications

References 28 publications

Compact High- Tc Superconducting Terahertz emitter operating up to 86 K

Compact High- Tc Superconducting Terahertz emitter operating up to 86 K

Terahertz-wave emission from Bi2212 intrinsic Josephson junctions: a review on recent progress

Preparation of Bi2Sr2CaCu2O8+δ(Bi2212) superconductor by Pechini sol–gel method: thermal decomposition and phase formation kinetics of the precursors

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