Reproducibility of Phonon Structures in the Tunneling Conductance of Bi2Sr2CaCu2O8

Reproducibility of phonon structures in the tunneling conductance of Bi 2 Sr 2 CaCu 2 O 8 is discussed in relation to their positions and intensities. As for the positions, correspondences with the phonon density of states are certainly observed. As for the intensity-ratios among structures corresponding to different phonon-modes, the reproducibility is not so certain as for the positions. As for the absolute intensity, which reflects the interaction strength, the apparent reproducibility is quite poor.