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Tunneling measurement for the energy gap in quaternary compound superconductors YNi2B2C, LuNi2B2C and YBCO by LTSTM
- Authors
- Jeong G.T.; Kye J.I.; Chun S.H.; Park W.K.; Khim Z.G.; Lee, Won Choon; Canfield P.C.; Cho B.K.; Johnston D.C.
- Issue Date
- Apr-1996
- Publisher
- THE PHYSICAL SOCIETY OF THE REPUBLIC OF CHINA
- Citation
- Chinese Journal of Physics, v.34, no.2-II, pp 406 - 413
- Pages
- 8
- Journal Title
- Chinese Journal of Physics
- Volume
- 34
- Number
- 2-II
- Start Page
- 406
- End Page
- 413
- ISSN
- 0577-9073
- Abstract
- Tunneling spectra of a single crystalline YNi2B2C (Tc = 15.4 K), LuNi2B2C (Tc= 15.7 K) and YBCO (Tc = 90 K) have been measured by a point contact spectroscopy using a low temperature scanning tunneling microscope. The conductance curve of RNi2B2C shows a smeared gap structure with an almost linear density of states inside of the gap region. The linear conductance inside the gap region has been explained by a proximity induced energy gap in the degraded surface normal layer. c-axis oriented YBCO films shows periodic current steps at the corresponding voltage of V = (2n+1)V0. Voltage period ΔV shows a dependence on the sample-to-tip distance implying the single electron tunneling nature.
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