OBSERVATION OF SUPERSTRUCTURES ON THE SURFACES OF SPUTTERED YBA2CU3O7-X THIN-FILMS BY LOW-ENERGY ELECTRON-DIFFRACTION

被引:6
作者
BEHNER, H [1 ]
RAUCH, W [1 ]
GORNIK, E [1 ]
机构
[1] TECH UNIV MUNICH,WALTER SCHOTTKY INST,W-8046 GARCHING,GERMANY
关键词
D O I
10.1063/1.107519
中图分类号
O59 [应用物理学];
学科分类号
摘要
The surface structures of sputtered c-axis-oriented YBa2Cu3O7-x (YBCO) thin films were studied by means of low-energy diffraction (LEED). The in situ analysis, without exposing the films to air, showed the formation of superstructures of the YBCO (001) 2 X 2 and YBCO (001) 4 X 1 type. Air-exposed surfaces showed no LEED pattern but could be transformed into the YBCO (001) 2 X 2 structure by annealing at 500-degrees-C. The observed superstructures are interpreted as being due to oxygen loss of the YBCO surface region, causing an oxygen vacancy ordering in the basal CuO planes.
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收藏
页码:1465 / 1467
页数:3
相关论文
共 10 条
[1]  
ALARIOFRANCO MA, 1988, PHYSICA C, V156, P455, DOI 10.1016/0921-4534(88)90771-X
[2]   SURFACE-LAYERS ON SUPERCONDUCTING Y-BA-CU-O FILMS STUDIED WITH X-RAY PHOTOELECTRON-SPECTROSCOPY [J].
CHANG, CC ;
HEGDE, MS ;
WU, XD ;
DUTTA, B ;
INAM, A ;
VENKATESAN, T ;
WILKENS, BJ ;
WACHTMAN, JB .
JOURNAL OF APPLIED PHYSICS, 1990, 67 (12) :7483-7487
[3]   SURFACE-COMPOSITION OF CLEAN, EPITAXIAL THIN-FILMS OF YBA2CU3O7-X FROM QUANTITATIVE X-RAY PHOTOEMISSION SPECTROSCOPY ANALYSIS [J].
FRANK, G ;
ZIEGLER, C ;
GOPEL, W .
PHYSICAL REVIEW B, 1991, 43 (04) :2828-2834
[4]   ATMOSPHERIC DETERIORATION OF CLEAN SURFACE OF EPITAXIAL (001)-YBACUO FILMS STUDIED BY LOW-ENERGY ELECTRON-DIFFRACTION [J].
OHARA, T ;
SAKUTA, K ;
KAMISHIRO, M ;
KOBAYASHI, T .
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 1991, 30 (12B) :L2085-L2087
[5]   DC-MAGNETRON SPUTTERING OF YBA2CU3O7-DELTA THIN-FILMS FOR MICROWAVE APPLICATIONS [J].
RAUCH, W ;
BEHNER, H ;
GIERES, G ;
SOLKNER, G ;
FOX, F ;
VALENZUELA, AA ;
GORNIK, E .
PHYSICA C, 1992, 198 (3-4) :389-396
[6]  
SHAREN MJ, 1991, JPN J APPL PHYS, V30, pL15
[7]   ANGLE-RESOLVED PHOTOEMISSION-STUDIES OF SINGLE-CRYSTAL YBA2CU3O7-X [J].
STOFFEL, NG ;
CHANG, Y ;
KELLY, MK ;
DOTTL, L ;
ONELLION, M ;
MORRIS, PA ;
BONNER, WA ;
MARGARITONDO, G .
PHYSICAL REVIEW B, 1988, 37 (13) :7952-7955
[8]   SURFACE-ANALYSIS OF C-AXIS-ORIENTED YBA2CU3O7-X THIN-FILMS BY QMS, XPS AND LEED - EFFECTS OF IN-VACUUM ANNEALING [J].
TANAKA, S ;
NAKAMURA, T ;
IIYAMA, M ;
YOSHIDA, N ;
TAKANO, S .
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 1991, 30 (8B) :L1458-L1461
[9]   LOW-ENERGY ION-SCATTERING SPECTROSCOPY OBSERVATIONS OF C-AXIS-ORIENTED YBA2CU3O7-X THIN-FILMS - EFFECTS OF IN-VACUUM ANNEALING [J].
TANAKA, S ;
NAKAMURA, T ;
IIYAMA, M ;
YOSHIDA, N ;
TAKANO, S ;
SHOJI, F ;
OURA, K .
APPLIED PHYSICS LETTERS, 1991, 59 (27) :3637-3639
[10]   DIFFRACTION EVIDENCE FOR OXYGEN-VACANCY ORDERING IN ANNEALED BA2YCU3O7-DELTA(0.3LESS-THAN-DELTA-OR-EQUAL-TO0.4) SUPERCONDUCTORS [J].
WERDER, DJ ;
CHEN, CH ;
CAVA, RJ ;
BATLOGG, B .
PHYSICAL REVIEW B, 1988, 37 (04) :2317-2319