Resonant Photoemission from the Surface of a High-Temperature Y-Ba-Cu-O Superconductor
Научная публикация
| Общее |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Оригинальная
|
| Конференция |
Восьмое Всесоюзное совещание по использованию синхротронного излучения
18-22 авг. 1988
,
Новосибирск
|
| Журнал |
Nuclear Instruments and Methods in Physics Research Section A
ISSN: 0168-9002
|
| Вых. Данные |
Год: 1989,
Том: 282,
Номер: 2-3,
Страницы: 688-691
Страниц
: 4
DOI:
10.1016/0168-9002(89)90082-X
|
| Авторы |
Devyatov V.G.
1
,
Koshcheev S.V.
1
,
Cherkashin A.E.
1
,
Gluskin E.S.
2
,
Dudnikov A.V.
3
,
Dudnikov V.G.
2
,
Sood A.K.
4
,
Sahnie V.S.
5
,
Ventkataraman G.
4
|
| Организации |
| 1 |
Institute of Catalysis, 630090 Novostbrrsk, USSR
|
| 2 |
Institute of Nuclear Physics, 630090 Novosibirsk, USSR
|
| 3 |
Novosibirsk University, 630090 Novosibirsk, USSR
|
| 4 |
Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India
|
| 5 |
Bhabha Atomic Research Centre, Trombay, Bombay 400 085, India
|
|
Photoemission measurements using synchrotron radiation are reported on YBa2Cu3O7−x having a superconducting transition temperature of 90 K. The experiments were performed over a photon energy range of 40–161 eV as well as using Mg X-rays. An unusual enhancement of photoemission intensity associated with Ba(5p) and Ba(5s) levels was observed for a photon energy of ∼104 eV. Our results suggest a different chemical composition of the surface and volume, two types of oxygen sites in the material, and a predominantly monovalent state of copper after Ar+ etching.