铁电Bi₀₅Na₀。₅TiO₃屏障在YBCO高tc约瑟夫森结中实现了相干性、可调性和逻辑功能

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-10-10 DOI:10.1016/j.jallcom.2025.184316

Muthukkumaran Karthikeyan , Anucha Watcharapasorn

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引用次数: 0

摘要

我们报告YBa₂Cu₃O₇ₓ|Bi₀.₅Na₀的制备和全面表征。₅TiO₃|YBa₂Cu₃O₇₀ₓ（YBCO|BNT|YBCO）含有铁电势垒的三层Josephson结。BNT层具有高介电常数（10 K时~500）、低损耗正切（tan δ ≈ 0.002-0.01）和低温下稳定的剩余极化（20 μC/cm²）。输运测量揭示了由温度、场和势垒厚度调制的临界电流密度。电流-电压（I-V）特性显示出明确的约瑟夫森行为，而Ic(T)曲线和IcRn产品符合Ambegaokar-Baratoff模型。磁场扫描产生的周期性和叶瓣清晰度高达80 K的类似弗劳恩霍夫的干涉图案，FFT分析证实了相干通量量化。低温扫描隧道显微镜（STM）显示了有序的涡旋晶格，揭示了超导相干长度与铁电畴结构之间的空间相关性。能隙谱和Ic(d)的指数衰减证实了BNT中邻近诱导的超导性，衰减长度为ξN ≈ 5.5 nm。极化控制门控能够动态调谐Ic，隧道光谱和电容，展示约瑟夫森耦合的静电调制。噪声光谱显示，在40 K以下，相干性增强（τφ）和高结质因子（Q >； 1000）。模拟测试了BNT势垒与SrTiO₃和Al₂O₃的对比，表明了优越的相干保持性、可调性和相位控制。最后，器件演示包括可调谐π结行为，与量子位调谐相关的电场控制Josephson相位动力学，以及可扩展的SQUID逻辑，具有电压通量调制和ΔE(E)特性，持续高达90 K。这些结果表明，BNT是一种多功能铁电势垒，可以实现与高tc集成兼容的可调谐超导量子器件。

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Ferroelectric Bi₀.₅Na₀.₅TiO₃ barriers enable coherence, tunability, and logic functionality in YBCO High-Tc Josephson junctions

We report the fabrication and comprehensive characterization of YBa₂Cu₃O₇₋ₓ|Bi₀.₅Na₀.₅TiO₃|YBa₂Cu₃O₇₋ₓ (YBCO|BNT|YBCO) trilayer Josephson junctions incorporating a ferroelectric barrier. The BNT layer exhibits a high dielectric constant (∼500 at 10 K), low loss tangent (tan δ ≈ 0.002–0.01), and stable remanent polarization (20 μC/cm²) down to cryogenic temperatures. Transport measurements reveal a critical current density modulated by temperature, field, and barrier thickness. Current–voltage (I–V) characteristics display clear Josephson behavior, while the I_c(T) profile and I_cR_n product conform to the Ambegaokar–Baratoff model. Magnetic field sweeps yield Fraunhofer-like interference patterns with periodicity and lobe sharpness preserved up to 80 K, and FFT analysis confirms coherent flux quantization. Low-temperature scanning tunneling microscopy (STM) visualizes well-ordered vortex lattices and reveals spatial correlation between superconducting coherence length and ferroelectric domain structure. Proximity-induced superconductivity in BNT is confirmed by energy gap spectra and an exponential decay of I_c(d), with a decay length ξ_N ≈ 5.5 nm. Polarization-controlled gating enables dynamic tuning of I_c, tunneling spectra, and capacitance, demonstrating electrostatic modulation of Josephson coupling. Noise spectroscopy reveals enhanced coherence (τ_φ) and a high junction quality factor (Q > 1000) below 40 K. Simulations benchmark the BNT barrier against SrTiO₃ and Al₂O₃, indicating superior coherence retention, tunability, and phase control. Finally, device demonstrations include tunable π-junction behavior, electric-field-controlled Josephson phase dynamics relevant to qubit tuning, and scalable SQUID logic, with voltage–flux modulation and ΔE(E) characteristics persisting up to 90 K. These results establish BNT as a multifunctional ferroelectric barrier enabling tunable superconducting quantum devices compatible with high-T_c integration.

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.