Growth and property analysis of large-area epitaxial Tl-2212 high temperature superconducting films

Lu, Jianghua; Liang, Xiaoping; He, Kaiyong; Xing, Jian; Xue, Ting; Xu, Ting; Wang, Litian; Zhang, Shengfang; Zhang, Xin; He, Ze; He, Ming; Cheng, Zhigang; Yan, S.L.; Feng, Min

doi:10.1016/j.ceramint.2019.08.195

Cited by 6 publications

(3 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A 500 nm thick high‐quality Tl‐2212 film was deposited on a 0.5 mm thick LaAlO 3 (001) substrate using a modified two‐step method. [ 52 ] The T c of the Tl‐2212 film is 105 K. The positive photoresist film was patterned to an array of DSRR structures and was used as the protective layer in the argon‐ion milling process. The free space THz time domain spectroscopy was used to measure the transmission spectra of Tl‐2212 films and DSRR metamaterial samples.…”

Section: Methodsmentioning

confidence: 99%

Josephson Plasmon Resonance in Tl₂Ba₂CaCu₂O₈ High‐Temperature Superconductor Tunable Terahertz Metamaterials

Guo

Duan

et al. 2021

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

The Josephson plasmon resonance (JPR) offers a valuable probe to investigate the superconductivity in layered cuprate superconductors. However, the coupling between free space radiation and JPR in high‐temperature superconductor (HTS) film remains challenging because the excitation of JPR demands the c‐axis oriented electric field. The subwavelength resonators in metamaterials can enhance the localized electric field, which can be utilized to resolve this difficulty. Here, a tunable terahertz (THz) metamaterial made from Tl2Ba2CaCu2O8 (Tl‐2212) HTS film is developed. The spectral response of Tl‐2212 metamaterial has a tunable property at temperatures up to 90 K. The resonant excitation of Josephson plasmon in the metamaterial is observed. Simulation results indicate that the scattering of subwavelength resonators can provide the component of the z‐axis electric field for the resonant excitation. The coupling between JPR and resonance modes of metamaterials is observed and explained using coupled mode theory. The temperature dependence of JPR frequency shows accordance with the experimental results of the pure film. This work provides an avenue to excite the JPR and probe superconducting condensate in the layered superconductor. The development of Josephson plasmonic metamaterials may contribute to tunable and nonlinear THz devices.

show abstract

Section: Methodsmentioning

confidence: 99%

Josephson Plasmon Resonance in Tl₂Ba₂CaCu₂O₈ High‐Temperature Superconductor Tunable Terahertz Metamaterials

Guo

Duan

et al. 2021

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…In this work, we use conventional photolithography, together with focused ion beam (FIB) direct-write lithography to fabricate superconducting microbridges on LAO step substrates. With our improved two-step method, [35,36] we present fabrication and electrical transport characterization of intrinsic Josephson junctions in Tl-2212 superconducting microbridges on a step substrate. We investigate the current-voltage characteristics of superconducting microbridges at different temperatures.…”

Section: Introductionmentioning

confidence: 99%

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

Zhao¹,

Tian²,

Liang³

et al. 2021

Chinese Phys. B

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…As a result, some non-superconducting phases may occur during the crystallization of thin films, which is one of the difficulties in the fabrication process. Comparing with the Hg-based JJs, Tl-based JJs are much easier to be prepared because the fabrication process of Tl-based films is less complicated than Hg-based films [34,35], especially Tl-2212 films can be easily achieved in large-area [36]. However, close to T c , thermally activated phase slippage (TAPS) [37] can disrupt the coupling of the order parameter of the two superconductors forming a Josephson junction.…”

Section: Introductionmentioning

confidence: 99%

Tl₂Ba₂CaCu₂O₈ bicrystal Josephson junctions operated close to 100 K

Zhao

Tian

Zhang

et al. 2020

Supercond. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

We have fabricated Tl 2 Ba 2 CaCu 2 O 8 (Tl-2212) bicrystal Josephson junctions (BJJs) on LaAlO 3 substrates and operated them at bath temperatures close to 100 K. The current-voltage characteristics of BJJs reveal that the critical current I c has a power-law relationship with temperature. In addition, the normal resistance R n has a universal value independent of the bath temperature. The performance of BJJs exhibits a perfect agreement with the Ambegaokar-Halperin model close to 100 K. Under microwave irradiation, Shapiro steps were clearly observed, confirming the genuine Josephson coupling through the grain boundary. We demonstrate that the maximum operating temperature of the proposed junction is up to 100 K, which is fairly close to the T c of the specimen. The results of Tl-2212 bicrystal Josephson junctions may open a new perspective in further studies on low-cost and portable superconducting devices.

show abstract

Growth and property analysis of large-area epitaxial Tl-2212 high temperature superconducting films

Cited by 6 publications

References 29 publications

Josephson Plasmon Resonance in Tl₂Ba₂CaCu₂O₈ High‐Temperature Superconductor Tunable Terahertz Metamaterials

Josephson Plasmon Resonance in Tl₂Ba₂CaCu₂O₈ High‐Temperature Superconductor Tunable Terahertz Metamaterials

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

Tl₂Ba₂CaCu₂O₈ bicrystal Josephson junctions operated close to 100 K

Contact Info

Product

Resources

About

Growth and property analysis of large-area epitaxial Tl-2212 high temperature superconducting films

Cited by 6 publications

References 29 publications

Josephson Plasmon Resonance in Tl2Ba2CaCu2O8 High‐Temperature Superconductor Tunable Terahertz Metamaterials

Josephson Plasmon Resonance in Tl2Ba2CaCu2O8 High‐Temperature Superconductor Tunable Terahertz Metamaterials

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

Tl2Ba2CaCu2O8 bicrystal Josephson junctions operated close to 100 K

Contact Info

Product

Resources

About

Josephson Plasmon Resonance in Tl₂Ba₂CaCu₂O₈ High‐Temperature Superconductor Tunable Terahertz Metamaterials

Josephson Plasmon Resonance in Tl₂Ba₂CaCu₂O₈ High‐Temperature Superconductor Tunable Terahertz Metamaterials

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

Tl₂Ba₂CaCu₂O₈ bicrystal Josephson junctions operated close to 100 K