Scanning tunneling microscopy of the a-b planes of Bi2(Ca,Sr)3Cu2O8+δ single crystal and thin film

Kirk, M. D.; Eom, C. B.; Oh, B.; Spielman, S. R.; Beasley, M. R.; Kapitulnik, A.; Geballe, T. H.; Quate, C. F.
June 1988
Applied Physics Letters;6/13/1988, Vol. 52 Issue 24, p2071
Academic Journal
A scanning tunneling microscope was used to image the a-b plane of a single crystal of Bi2(Ca,Sr)3Cu2O8+δ (Tc∼85 K) and a thin film grown epitaxially on a (100) SrTiO3 substrate. Images taken at room temperature in air of a freshly cleaved bulk sample clearly show the one-dimensional superstructure (27.2±0.7 Å periodicity) which is common to this phase. Several images show steps 16 Å high, suggesting that the cleavage occurs between 2122 molecular units. The registry of the superstructure from terrace to terrace is either shifted by half a superlattice parameter or is aligned. Images of evaporated thin films show features of comparable size, but not the same long-range order as the crystal. Low-temperature conductance measurements of the thin film exhibit a BCS-like energy gap with 2Δ/kTc≊12.


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