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arxiv: cond-mat/0111340 · v1 · submitted 2001-11-19 · ❄️ cond-mat.supr-con · cond-mat.str-el

Superconducting properties of La-substituted Bi-2201 crystals

Ya. G. Ponomarev , N. Z. Timergaleev , Kim Ki Uk , M. A. Lorenz , G. Mueller , H. Piel , H. Schmidt , A. Krapf
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T. E. Os'kina Yu. D. Tretyakov V. F. Kozlovskii
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classification ❄️ cond-mat.supr-con cond-mat.str-el
keywords beencrystalsdeltarangesuperconductingbi-2201bi2sr2-xlaxcuo6c-direction
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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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