INFLUENCE OF THE CHARACTERISTICS OF A SRTIO3 BUFFER LAYER ON THE SUPERCONDUCTIVITY OF LASER-ABLATED YBA2CU3O7-DELTA FILMS

被引：11

作者：

CHENG, HF

LIN, CH

LIN, HY

LO, JT

TSENG, TF

LIU, KS

LIN, IN

机构：

[1] NATL TSING HUA UNIV,CTR MAT SCI,HSINCHU 300,TAIWAN

[2] TATUNG INST TECHNOL,DEPT PHYS,TAIPEI,TAIWAN

[3] NATL TAIWAN NORMAL UNIV,DEPT PHYS,TAIPEI 117,TAIWAN

[4] NATL TSING HUA UNIV,DEPT MAT SCI & ENGN,HSINCHU 300,TAIWAN

来源：

PHYSICA C | 1994年 / 230卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(94)90839-7

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The superconductivity of YBa2Cu3O7-partial-derivatives (YBCO) films grown on MgO substrate materials has been modified significantly using SrTiO3 (STO) films as buffer layers. The role of the STO layer has been examined by conventional wide-angle X-ray diffraction (XRD), by atomic force microscopy (AFM) and by grazing-incident X-ray diffraction (GIXD) techniques and it has been found (i) to suppress the interaction between the films and the substrate materials and (ii) to enhance the nucleation and growth of (001)-oriented YBCO grains. The (001) epitaxial STO films are found to be of decisive importance to optimization of the superconductivity of the subsequently deposited YBCO films. Both the substrate temperature (720-degrees-C) and oxygen pressure (0.02 mbar) have to be stringently controlled for this purpose. The YBCO/STO/MgO films thus obtained possess excellent superconducting properties with T(c) = 90 K and transition width DELTAT = 2 K.

引用

页码：267 / 273

页数：7

共 17 条

[1] REPRODUCIBLE GROWTH OF HIGH-QUALITY YBA2CU3O7-X FILM ON (100) MGO WITH A SRTIO3 BUFFER LAYER BY PULSED LASER DEPOSITION [J].