Abstract
We have performed point-contact tunneling measurements on overdoped Bi 2Sr 1..94La 0.06CuO 6+δ (Bi2201) single crystals with gold tips. Sharp zero bias conductance peak (ZBCP) was observed. The data were analyzed with extended BTK theory. We found that the dx 2-y 2-wave symmetry gap parameter can fit the data nicely.
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