Thermal stability of YBa{sub 2}Cu{sub 3}O{sub 7{minus}x} single crystal surfaces investigated by the ion channeling technique
- Superconductivity Research Laboratory, ISTEC, 1-10-13 Shinonome, Koto-ku, Tokyo 135 (Japan)
We have performed ion channeling characterizations on the (001) and (100) surfaces of YBa{sub 2}Cu{sub 3}O{sub 7{minus}x} single crystals, using 950 keV He{sup +} ions at temperatures ranging from 20 to 780{degree}C. In oxygen pressures below 5{times}10{sup {minus}5}Torr, we directly observed the surface changes as the sample temperature was increased, and found that the compositional and structural changes occurred from around 400{degree}C. At higher oxygen pressures, we heated the crystals and performed channeling analysis before and after the heating. We found that the YBa{sub 2}Cu{sub 3}O{sub 7{minus}x} crystal surfaces were stable at temperatures up to 780{degree}C in the oxygen pressure range of 1 mTorr{endash}1 Torr. Beyond this range, the surfaces deteriorated at high temperatures. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 527962
- Journal Information:
- Applied Physics Letters, Vol. 71, Issue 6; Other Information: PBD: Aug 1997
- Country of Publication:
- United States
- Language:
- English
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