Electronic structures of two-phase microstructures α and β in heavily Pb-doped Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub y] single crystals investigated by scanning tunneling microscopy/spectroscopy

Kinoda, G.; Hasegawa, T.; Nakao, S.; Hanaguri, T.; Kitazawa, K.; Shimizu, K.; Shimoyama, J.; Kishio, K.
August 2003
Applied Physics Letters;8/11/2003, Vol. 83 Issue 6, p1178
Academic Journal
We have performed scanning tunneling microscopy/spectroscopy (STM/STS) of a high-J[sub c] superconductor, heavily Pb-doped Pb[sub 0.6]Bi[sub 1.4]Sr[sub 2]CaCu[sub 2]O[sub y], at low temperatures below T[sub c]. The obtained STM images showed a lamella-type phase separation into Pb-poor and Pb-rich regions. At 4.3 K, values of energy gap Δ, deduced from STS spectra, showed considerable inhomogeneity in the range of 20–80 meV, while Δ variations across the phase boundaries were less significant. At 63 K, in contrast, we found that Δ altered sharply at the boundaries particularly in the annealed samples, resulting from the suppression of electronic inhomogeneity in each phase. This suggests that the phase boundaries act as strong pinning centers at higher temperatures. © 2003 American Institute of Physics.


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