Distinction between critical current effects and intrinsic anomalies in the point-contact Andreev reflection spectra of unconventional superconductors

He, Ge; Wei, Zhongxu; Brisbois, Jérémy; Jia, Yunfei; Huang, Yulong; Zhou, Huan‐Qiang; Silhanek, Alejandro; Shan, Lei; Zhu, Bo; Yuan, Jie; Dong, Xianlin; Zhou, Fang; Zhao, Zhongxian; Jin, Kui

doi:10.1088/1674-1056/27/4/047403

Cited by 5 publications

(3 citation statements)

References 50 publications

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“…Hybrid structures of BiSbTe 1.25 Se 1.75 40 and Bi 2 Se 3 42 on superconducting NbSe 2 substrates have yielded similar results at low temperature, with Γ/Δ ≈ 0.27 and 0.2 respectively. The conductance is in good agreement with a single gap BTK model, however it can be noted that proximity effects can also occur at the interface Ti/Au electrodes and the superconducting TI 43 , 44 .…”

Section: Resultssupporting

confidence: 70%

Investigations of proximity-induced superconductivity in the topological insulator Bi2Te3 by microRaman spectroscopy

Kiphart

Harkavyi

Balin

et al. 2021

Sci Rep

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We used the topological insulator (TI) Bi2Te3 and a high-temperature superconductor (HTSC) hybrid device for investigations of proximity-induced superconductivity (PS) in the TI. Application of the superconductor YBa2Cu3O7-δ (YBCO) enabled us to access higher temperature and energy scales for this phenomenon. The HTSC in the hybrid device exhibits emergence of a pseudogap state for T > Tc that converts into a superconducting state with a reduced gap for T < Tc. The conversion process has been reflected in Raman spectra collected from the TI. Complementary charge transport experiments revealed emergence of the proximity-induced superconducting gap in the TI and the reduced superconducting gap in the HTSC, but no signature of the pseudogap. This allowed us to conclude that Raman spectroscopy reveals formation of the pseudogap state but cannot distinguish the proximity-induced superconducting state in the TI from the superconducting state in the HTSC characterised by the reduced gap. Results of our experiments have shown that Raman spectroscopy is a complementary technique to classic charge transport experiments and is a powerful tool for investigation of the proximity-induced superconductivity in the Bi2Te3.

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Section: Resultssupporting

confidence: 70%

Investigations of proximity-induced superconductivity in the topological insulator Bi2Te3 by microRaman spectroscopy

Kiphart

Harkavyi

Balin

et al. 2021

Sci Rep

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“…在测量过程中需要多次调节改变界面势垒高度, 从而能够外推得到Z=0情况下的自旋极化率 [42,43] . 征 [48,49] . 这些特征与某些非常规超导体上沿节点入射的谱型非常相似 [3] , 这就导致在新超导体的探索研究 [51,52] .…”

Section: 点接触的制备与测量unclassified

Applications of point-contact spectroscopy in the study of topological materials

Hou¹,

Chen²,

Hao³

et al. 2021

Sci. Sin.-Phys. Mech. Astron.

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“…On the other hand, for the measurement of pointcontact spectroscopy, the positive differential conductance dip has been extensively reported [44][45][46][47][48][49][50] and can be generally attributed to the critical supercurrent effect due to the Maxwell resistance in the non-ballistic regime, as reported by Sheet et al [45] Moreover, Shan et al [44] explained the dip using the combination of superconducting proximity in the normal metal and Josephson tunnelling in the polycrystalline superconductor.…”

mentioning

confidence: 95%

Gate-Tunable Negative Differential Conductance in Hybrid Semiconductor–Superconductor Devices

Zhao

Pan

Liu

et al. 2023

Chinese Phys. Lett.

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Negative differential conductance (NDC) serves as a crucial characteristic that reveals various underlying physics and transport process in hybrid superconducting devices. In this work, we report the observation of gate-tunable NDC outside the superconducting energy gap on two types of hybrid semiconductor-superconductor devices, i.e., normal metal-superconducting nanowire-normal metal and normal metal-superconducting nanowire-superconductor devices. Specifically, we study the dependence of the NDCs on back-gate voltage and magnetic field. When the back-gate voltage decreases, these NDCs weaken and evolve into positive differential conductance dips; and meanwhile they move away from the superconducting gap towards high bias voltage, and disappear eventually. In addition, with the increase of magnetic field, the NDCs/dips follow the evolution of the superconducting gap, and disappear when the gap closes. We interpret these observations and reach a good agreement by combining the Blonder-Tinkham-Klapwijk (BTK) model and the critical supercurrent effect in the nanowire, which we call the BTK-supercurrent model. Our results provide an in-depth understanding of the tunneling transport in hybrid semiconductor-superconductor devices.

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Distinction between critical current effects and intrinsic anomalies in the point-contact Andreev reflection spectra of unconventional superconductors

Cited by 5 publications

References 50 publications

Investigations of proximity-induced superconductivity in the topological insulator Bi2Te3 by microRaman spectroscopy

Investigations of proximity-induced superconductivity in the topological insulator Bi2Te3 by microRaman spectroscopy

Applications of point-contact spectroscopy in the study of topological materials

Gate-Tunable Negative Differential Conductance in Hybrid Semiconductor–Superconductor Devices

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