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

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.
Authors:
; ; ; ; ; ; ;  [1] ; ;  [2] ; ;  [1] ;  [3]
  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)
  3. (China)
Publication Date:
OSTI Identifier:
22402463
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 20; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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