Reactivity and passivation for Bi adatoms on YBa2Cu3O6.9 and Bi2Ca1+xSr2-xCu2O8+y

Meyer, H. M.; Hill, D. M.; Weaver, J. H.; Nelson, D. L.; Goretta, K. C.
September 1988
Applied Physics Letters;9/12/1988, Vol. 53 Issue 11, p1004
Academic Journal
X-ray photoemission spectroscopy was used to examine the reactivity of clean YBa[sub 2]Cu[sub 3]O[sub 6.9] and Bi[sub 2]Ca[sub 1+x]Sr[sub 2-x]Cu[sub 2]O[sub 8+y] surfaces with adatoms of vapor-deposited bismuth. For YBa[sub 2]Cu[sub 3]O[sub 6.9], depositions ≤8 Å of Bi induce O 1s, Cu 2p[sub &frac32;], and Bi 4f line-shape changes due to Bi-O bonding, limited oxygen loss from the substrate, partial conversion of Cu[sup 2+] to Cu[sup 1+], and growth of Bi metal. For coverages greater than 8 Å, there is no reaction and only Bi metal growth is observed. For Bi deposition onto Bi[sub 1]Ca[sub 1+x]Sr[sub 2-x]Cu[sub 2]O[sub 8+y], there is minimal reaction with only subtle O 1s and Ca 2p[sub &frac32;] line-shape changes and the nucleation and growth of Bi metal starting at low coverages (≥2 Å). Comparison shows that Bi is tess reactive than other metals, except Ag and Au, and that Bi[sub 2]Ca[sub 1+x]Sr[sub 2-x]Cu[sub 2]O[sub 8+y] is more stable toward Bi deposition than YBa[sub 2]Cu[sub 3]O[sub 6.9].


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