Superconducting properties of La-substituted Bi-2201 crystals

Details Superconducting properties of La-substituted Bi-2201 crystals Superconducting properties of La-substituted Bi-2201 crystals

2001-11-19

arxiv.org/abs/cond-mat/0111340v1

Physics

Condensed Matter

Superconductivity

Scientific paper

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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