Tunneling spectroscopy of Al/AlOx/Pb subjected to hydrostatic pressure

Tunneling spectroscopy of Al/AlOx/Pb subjected to hydrostatic pressure
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静水压力下 Al/AlOx/Pb 的隧道光谱

DOI:
10.1063/1.4921276
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发表时间:
2015-05
影响因子:
4
通讯作者:
Ren Cong
Ren Cong
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhu Jun;Yang Zheng-Xin;Hou Xing-Yuan;Guan Tong;Zhang Qin-Tong;Li Yong-Qing;Han Xiu-Feng;Zhang Jin;Li Chun-Hong;Shan Lei;Chen Gen-Fu;Ren Cong

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我们将电子隧穿谱测量与高压技术相结合,发展了一种研究高压电子态密度的实验工具。研究表明,Al/AlOx/Pb结的隧道谱测量系统地经受了高达2.2GPa的静水压力。在如此高的压力下,正常状态的结电阻对所施加的压力敏感,反映了势垒材料的能带结构随压力的变化。在超导态下,提取了能隙Δ0、差距比2Δ0/kBTc和声子谱能量随压力的变化关系,并与有限压力范围内的结果进行了比较。我们的实验结果表明了高压隧道谱的可行性和有效性,为高压超导提供了丰富的信息。
We develop an experimental tool to investigate high-pressure electronic density of state by combining electron tunneling spectroscopy measurements with high-pressure technique. It is demonstrated that tunneling spectroscopy measurement on Al/AlOx/Pb junction is systematically subjected to hydrostatic pressure up to 2.2 GPa. Under such high pressure, the normal state junction resistance is sensitive to the applied pressure, reflecting the variation of band structure of the barrier material upon pressures. In superconducting state, the pressure dependence of the energy gap Δ0, the gap ratio 2Δ0/kBTc, and the phonon spectral energy is extracted and compared with those obtained in the limited pressure range. Our experimental results show the accessibility and validity of high pressure tunneling spectroscopy, offering wealthy information about high pressure superconductivity.
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发表时间: 1969
期刊: --
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