NUCLEATION AND GROWTH OF DYBA2CU3O7-X THIN-FILMS ON SRTIO3 SUBSTRATES STUDIED BY TRANSMISSION ELECTRON-MICROSCOPY AND ATOMIC FORCE MICROSCOPY

被引:19
作者
AGRAWAL, V [1 ]
CHANDRASEKHAR, N [1 ]
ZHANG, YJ [1 ]
ACHUTHARAMAN, VS [1 ]
MECARTNEY, ML [1 ]
GOLDMAN, AM [1 ]
机构
[1] UNIV MINNESOTA,SCH PHYS & ASTRON,MINNEAPOLIS,MN 55455
来源
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS | 1992年 / 10卷 / 04期
关键词
D O I
10.1116/1.578040
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The microstructure of superconducting films influence their properties, requiring optimization of processing conditions. The early stages of nucleation and growth determine the final microstructure of the film. We report our studies of the initial stages of epitaxial growth of DyBa2CU3O7-x films on SrTiO3 substrates by transmission electron microscopy (TEM), atomic force microscopy (AFM), and reflection high energy electron diffraction (RHEED). Prethinned, electron transparent, reconstructed (100) and (110) SrTiO3 substrates were used to deposit 40-, 100-, and 1000-angstrom-thick DBCO films by ozone-assisted molecular beam epitaxy (MBE). The reconstructed substrates have a stepped surface and the film nucleates preferentially at the steps giving rise to an interconnected network of islands. The growth mechanism appears to be nucleation at the step edges and propagation of these steps. In situ reflection high energy electron diffraction yielded identical conclusions. Islands saturate at a certain size and further coverage merely increases the number of islands. This has significance in the application of ultrathin DyBa2Cu3O7-x films to devices and their use as a model systems to study superconductivity. Factors other than the substrate temperature, such as substrate surface morphology are found to influence the epitaxial relationship.
引用
收藏
页码:1531 / 1536
页数:6
相关论文
共 9 条
  • [1] INSITU GROWTH OF DYBA2CU3O7-X THIN-FILMS BY MOLECULAR-BEAM EPITAXY
    JOHNSON, BR
    BEAUCHAMP, KM
    WANG, T
    LIU, JX
    MCGREER, KA
    WAN, JC
    TUOMINEN, M
    ZHANG, YJ
    MECARTNEY, ML
    GOLDMAN, AM
    [J]. APPLIED PHYSICS LETTERS, 1990, 56 (19) : 1911 - 1913
  • [2] OBSERVATION OF THE EARLY STAGES OF GROWTH OF SUPERCONDUCTING THIN-FILMS BY TRANSMISSION ELECTRON-MICROSCOPY
    NORTON, MG
    TIETZ, LA
    SUMMERFELT, SR
    CARTER, CB
    [J]. APPLIED PHYSICS LETTERS, 1989, 55 (22) : 2348 - 2350
  • [3] STRUCTURAL PERFECTION OF Y-BA-CU-O THIN-FILMS CONTROLLED BY THE GROWTH-MECHANISM
    RAMESH, R
    CHANG, CC
    RAVI, TS
    HWANG, DM
    INAM, A
    XI, XX
    LI, Q
    WU, XD
    VENKATESAN, T
    [J]. APPLIED PHYSICS LETTERS, 1990, 57 (10) : 1064 - 1066
  • [4] STREIFFER SK, 1991, PHYS REV B, V41, P13890
  • [5] SUSNITZKY DW, 1986, MATER RES SOC S P, V60, P219
  • [6] REFLECTION HIGH-ENERGY ELECTRON-DIFFRACTION OSCILLATIONS DURING EPITAXIAL-GROWTH OF HIGH-TEMPERATURE SUPERCONDUCTING OXIDES
    TERASHIMA, T
    BANDO, Y
    IIJIMA, K
    YAMAMOTO, K
    HIRATA, K
    HAYASHI, K
    KAMIGAKI, K
    TERAUCHI, H
    [J]. PHYSICAL REVIEW LETTERS, 1990, 65 (21) : 2684 - 2687
  • [7] INITIAL-STAGE OF EPITAXIAL-GROWTH OF YBA2CU3O7-X THIN-FILMS
    TERASHIMA, T
    BANDO, Y
    IIJIMA, K
    YAMAMOTO, K
    HIRATA, K
    KAMIGAKI, K
    TERAUCHI, H
    [J]. PHYSICA C, 1989, 162 : 615 - 616
  • [8] HIGH-TEMPERATURE SUPERCONDUCTIVITY IN ULTRATHIN FILMS OF Y1BA2CU3O7-X
    VENKATESAN, T
    WU, XD
    DUTTA, B
    INAM, A
    HEDGE, MS
    HWANG, DM
    CHANG, CC
    NAZAR, L
    WILKENS, B
    [J]. APPLIED PHYSICS LETTERS, 1989, 54 (06) : 581 - 583
  • [9] PREPARATION AND SUPERCONDUCTING PROPERTIES OF ULTRATHIN YBA2CU3O7-X FILMS
    XI, XX
    GEERK, J
    LINKER, G
    LI, Q
    MEYER, O
    [J]. APPLIED PHYSICS LETTERS, 1989, 54 (23) : 2367 - 2369