Growth of strongly biaxially aligned MgB2 thin films on sapphire by postannealing of amorphous precursors

被引：38
作者：
Berenov, A
Lockman, Z
Qi, X
MacManus-Driscoll, JL
Bugoslavsky, Y
Cohen, LF
Jo, MH
Stelmashenko, NA
Tsaneva, VN
Kambara, M
Babu, NH
Cardwell, DA
Blamire, MG
机构：
[1] Univ London Imperial Coll Sci Technol & Med, Dept Mat, London SW7 2BP, England
[2] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2BZ, England
[3] Univ Cambridge, Irc Superconduct, Cambridge CB3 0HE, England
来源：
APPLIED PHYSICS LETTERS | 2001年 / 79卷 / 24期
关键词：
D O I：
10.1063/1.1424070
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
MgB2 thin films were cold grown on sapphire substrates by pulsed laser deposition followed by postannealing in mixed, reducing gas, Mg rich, Zr gettered, environments (pO(2)similar to 10(-24) atm) at 750 and 950 degreesC. The films had T-c in the range 29-34 K, J(c) (20 K, H=0) in the range 3x10(4)-3x10(5) A cm(-2), and irreversibility fields H-* at 20 K of 4-6.2 T. An inverse correlation was found between T-c and H-*. The films had grain sizes of similar to0.1-1 mum and a strong biaxial alignment was observed in the 950 degreesC annealed film. (111) oriented MgO was also observed. Mg coating of films during crystallization appeared to improve film T-c. (C) 2001 American Institute of Physics.
引用
收藏
页码：4001 / 4003
页数：3
相关论文
共 14 条
[11]  
MACMANUSDRISCOL.JL, UNPUB
[12]   Superconductivity at 39 K in magnesium diboride [J].
Nagamatsu, J ;
Nakagawa, N ;
Muranaka, T ;
Zenitani, Y ;
Akimitsu, J .
NATURE, 2001, 410 (6824) :63-64
[13]   Electronic anisotropy, magnetic field-temperature phase diagram and their dependence on resistivity in c-axis oriented MgB2 thin films [J].
Patnaik, S ;
Cooley, LD ;
Gurevich, A ;
Polyanskii, AA ;
Jing, J ;
Cai, XY ;
Squitieri, AA ;
Naus, MT ;
Lee, MK ;
Choi, JH ;
Belenky, L ;
Bu, SD ;
Letteri, J ;
Song, X ;
Schlom, DG ;
Babcock, SE ;
Eom, CB ;
Hellstrom, EE ;
Larbalestier, DC .
SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2001, 14 (06) :315-319
[14]  
ZHAI H, 0103618 CONDMAT
12