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Two-gap structure in Yb(Y)Ba2Cu3O7−x single crystals (1994)

Aminov, B. A. ; Hein, M. A. ; Müller, G. ; [et al.]

Springer

Journal of superconductivity 7 (1994), S. 361-365

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ISSN: 1572-9605

Keywords: Tunneling spectroscopy ; high-T c superconductors

Source: Springer Online Journal Archives 1860-2000

Topics: Electrical Engineering, Measurement and Control Technology , Physics

Notes: Abstract Tunneling effects in YbBa2Cu3O7−x (YbBCO) and YbBa2Cu3O7−x (YBCO) single crystals have been investigated using an improved technique of break junction preparation. A two-gap structure with BCS-like density of states has been observed. The value of the “large” gap is in the range of 24–28 meV for YBCO (T c =85–90 K) and 29–30 meV for YbBCO (T c =87–90 K). A variation of the value of the “small” gap between 0.5 and 11 meV has been detected, even for the same crystal. As a possible explanation, two-band superconductivity, surface properties, or strong gap anisotropy will be discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00724569

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