Tunneling spectroscopy of Al/AlO{sub x}/Pb subjected to hydrostatic pressure

Journal Article · Mon May 18 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4921276· OSTI ID:22402463

Zhu, Jun; Hou, Xing-Yuan; Guan, Tong; Zhang, Qin-Tong; Li, Yong-Qing; Han, Xiu-Feng; Li, Chun-Hong; Ren, Cong ^[1]; Yang, Zheng-Xin; Zhang, Jin ^[2]; Shan, Lei; Chen, Gen-Fu ^[1]

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1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)
2. Physics Department of Yunnan University, Kunming 0871 (China)

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/AlO{sub x}/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 Δ{sub 0}, the gap ratio 2Δ{sub 0}/k{sub B}T{sub c}, 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.

• OSTI ID: 22402463
• Journal Information: Applied Physics Letters, Vol. 106, Issue 20; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CONNECTORS
DENSITY OF STATES
ELECTRON SPECTROSCOPY
ENERGY GAP
PHONONS
PRESSURE DEPENDENCE
PRESSURE RANGE GIGA PA
SUPERCONDUCTIVITY
TUNNEL EFFECT