Superconducting properties of La-substituted Bi-2201 crystals
Ponomarev, Ya. G. · Timergaleev, N. Z. · Uk, Kim Ki · Lorenz, M. A. · Mueller, G. · Piel, H. · Schmidt, H. · Krapf, A. · Os'kina, T. E. · Tretyakov, Yu. D. · Kozlovskii, V. F.
Original · EN
The superconducting gap Delta has been measured in Bi2Sr2-xLaxCuO6+d single crystals in a wide range of temperatures 4.2 K < T < Tc by point-contact and tunnelling spectroscopy for current in c-direction. The value of Delta(4.2 K) was found to scale with the critical temperature Tc in the whole range of doping levels with the ratio 2D/kTc = 12.5 +/- 2. The closing of the gap Ds at T = Tc has been registered in the underdoped, optimally doped as well as in the overdoped sam-ples.
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