Intrinsic Josephson junctions of Tl2Ba2CaCu2Ox thin films for high frequency devices

Nemoto, Masaaki; Shimaoka, Kazuhiro; Yoshida, Isao; Yoshisato, Yoriobu

doi:10.1016/s0921-4534(97)01511-6

Cited by 13 publications

(8 citation statements)

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“…[1][2][3][4][5][6] The currentvoltage curve ͑IVC͒ of Bi 2 Sr 2 CaCu 2 O 8 ͑BSCCO͒ represents a set of resistive branches. 1,2 For BSCCO a longitudinal Josephson plasma resonance due to IJE has been recognized in microwave absorption measurement as well.…”

Section: Tanaka and H Kojimamentioning

confidence: 99%

Intrinsic Josephson effect in La2−xSrxCuO4 mesa junctions with niobium counter electrode

Uematsu

Nakajima

Yamashita

et al. 1998

Applied Physics Letters

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We reveal the intrinsic Josephson effect in a La2−xSrxCuO4 (LSCO) high-Tc superconductor. Nb counterelectrodes are deposited on top of mesas, which are formed on surfaces either parallel or perpendicular to the ab plane of LSCO single crystals. Nb/LSCO interfaces behave as SNS Josephson junctions. For the junctions parallel to the ab plane, we observe many branches in the current–voltage characteristics due to intrinsic Josephson effects. The voltage gaps between the branches are typically 0.1 mV, which is much smaller than the superconducting energy gap 2Δ≅11 mV expected for LSCO from Bardeen–Cooper–Schrieffer theory.

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Section: Tanaka and H Kojimamentioning

confidence: 99%

Intrinsic Josephson effect in La2−xSrxCuO4 mesa junctions with niobium counter electrode

Uematsu

Nakajima

Yamashita

et al. 1998

Applied Physics Letters

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“…The model predicts I c ∝ (1 − t). If the grains are separated by a normal metal, the film forms superconductor-normal metalsuperconductor (S-N-S) junctions for which I c ∝ (1 − t) 2 as predicted by the de Gennes model [7]. When both metal and insulator forms form a tunnelling barrier, the junctions are superconductor-normal metal-insulator-superconductor 3 Author to whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 95%

“…However, a true planar Josephson junction with an insulating tunnel barrier has not been realized so far due to small superconducting coherence length and severe degradation of the superconductor at the interface. Weak links with Josephson-like properties occur naturally across the grain boundaries of a polycrystalline high-T c superconducting sample and these behave as Josephson junctions [1][2][3]. Efforts have been made to fabricate HTSC devices [4,5] utilizing naturally present grain boundary Josephson junctions (GBJJs).…”

Section: Introductionmentioning

confidence: 99%

Grain boundary Josephson studies in BiSrCaCuO microbridges

Kaur¹,

Gupta²

2002

J. Phys. D: Appl. Phys.

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High-quality superconducting thin films of Bi2Sr2CaCu2OY have successfully been deposited on MgO (100) substrate using spray pyrolysis technique. Microbridge structures of various dimensions were patterned on the superconducting films using various techniques. A systematic study of the temperature dependence of the critical current (Ic) of the microbridges was carried out to understand the nature of the grain boundary Josephson weak links. These studies showed that the nature of the grain boundary weak links could vary from superconductor-normal metal-superconductor to superconductor-normal metal-insulator-superconductor to superconductor-insulator-superconductor, as the Jc of the microbridges is gradually decreased. The irradiation of microwaves on these microbridges led to the appearance of well-defined Shapiro steps in the I-V characteristics.

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“…Yoshikawa et al reported that both types of step-edge junctions or IJJs can be shown on a step substrate of the same angle (about 28 • ), which depends on the height of the steps. [33,34] The relationship between the step angle and the type of junctions needs to be verified by further experiments. More studies are essential to provide evidence for this field.…”

Section: Introductionmentioning

confidence: 99%

Transport properties of Tl₂Ba₂CaCu₂O₈ microbridges on a low-angle step substrate

Zhao¹,

Tian²,

Liang³

et al. 2021

Chinese Phys. B

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Tl-based superconducting devices have been drawn much attention for their high transition temperature (T c), which allow the high temperature superconductors (HTS) devices to operate at temperature near 100 K. The realization of Tl-based devices will promote the research and application of HTS devices. In this work, we present transport properties of Tl2Ba2CaCu2O8 (Tl-2212) microbridges across a low-angle step on LaAlO3 (LAO) substrate. We experimentally demonstrate intrinsic Josephson effects (IJEs) in Tl-2212 films by tailoring the geometry, i.e., reducing the width of the microbridges. In the case of a 1 μm width microbridge, in addition to the observation of voltage branches and remarkable hysteresis on the current–voltage (I–V) characteristics, the temperature dependence of differential resistance shows a finite resistance above 60 K when the bias current is below the critical current. For comparison, the wider microbridges are also investigated, exhibiting a highly critical current but do not showing obvious IJEs.

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Intrinsic Josephson junctions of Tl2Ba2CaCu2Ox thin films for high frequency devices

Cited by 13 publications

References 0 publications

Intrinsic Josephson effect in La2−xSrxCuO4 mesa junctions with niobium counter electrode

Intrinsic Josephson effect in La2−xSrxCuO4 mesa junctions with niobium counter electrode

Grain boundary Josephson studies in BiSrCaCuO microbridges

Transport properties of Tl₂Ba₂CaCu₂O₈ microbridges on a low-angle step substrate

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Intrinsic Josephson junctions of Tl2Ba2CaCu2Ox thin films for high frequency devices

Cited by 13 publications

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Intrinsic Josephson effect in La2−xSrxCuO4 mesa junctions with niobium counter electrode

Intrinsic Josephson effect in La2−xSrxCuO4 mesa junctions with niobium counter electrode

Grain boundary Josephson studies in BiSrCaCuO microbridges

Transport properties of Tl2Ba2CaCu2O8 microbridges on a low-angle step substrate

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Product

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Transport properties of Tl₂Ba₂CaCu₂O₈ microbridges on a low-angle step substrate