Observation of a halide (F/Cl) stabilized, new perovskite phase in superconducting Y2Ba5Cu7Ox films

Kwo, J.; Hong, M.; Fleming, R. M.; Hebard, A. F.; Mandich, M. L.; DeSantolo, A. M.; Davidson, B. A.; Marsh, P.; Hobbins, N. D.
May 1988
Applied Physics Letters;5/9/1988, Vol. 52 Issue 19, p1625
Academic Journal
A new, ordered perovskite structure was stabilized as a majority phase in superconducting Y2Ba5Cu7O20-δ’(F/Cl)δ‘ films epitaxially grown on SrTiO3(100). The new phase was formed via fluorination or chlorination introduced during the post-deposition O2 furnace anneal for recrystallization. The structure is determined by x-ray diffraction to be an orthorhombic unit cell [a∼b=3.86(1) Å, c=27.24(6) Å] with reflection conditions consistent with a fully twinned A-centered cell. Films containing primarily the new phase show a lower resistivity ρ(300 K)∼177 μΩ cm, a comparable ratio of ρ(300 K)/ρ(100 K)∼3.0, and a lower superconducting temperature of 78–74 K when compared to Y1Ba2Cu3O7.


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