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Clusters of Long- c Lattice Phase in {\rm SmBa}_{2}{\rm Cu}_{3}{\rm O}_{y} Films Grown in Low- P_{{\rm O}2} Atmosphere by Pulse Laser Deposition

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4 Author(s)
Akio Tsukada ; Geballe Lab. for Adv. Mater., Stanford Univ., Stanford, CA, USA ; In-Gann Chen ; Robert Hammond ; Malcolm Beasley

Phase stability diagram and boundary of a- and c-axis orientation of SmBa2Cu3Oy films grown by pulsed laser deposition were studied. In the study, anomalously long-c tetragonal SmBa2Cu3Oy were discovered in films grown in low oxygen pressure. The long-c phase has 1% longer c-axis lattice constant compared to normal-c orthorhombic SmBa2Cu3Oy and has lower superconducting transition temperature ( ~ 70 K). The long-c phase is able to coexist in the normal-c matrix over a range of oxygen pressure and growth temperature.

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:19 ,  Issue: 3 )