Point-contact spectroscopy of the high-temperature superconductor BiSrCaCuO
The maximum value of the energy gap $Δ\simeq 8\ meV$ and the ratio $2δ/kT_c\simeq~2.5$ are determined for a high-temperature superconductor $\rm Bi_2Sr_2CaCu_2O_{8+y}$ by using point contacts. It was found that the high-temperature superconductor is transformed under the effect of current injection of quasiparticles to a new modified state with a reduced gap, which is stable in a wide range of injection intensity.
cond-mat.supr-con↗