Theoretical investigation on 3rd harmonic voltage in inductive measurements of critical current density in superconducting films

被引:3
作者
Mawatari, Y [1 ]
Yamasaki, H [1 ]
Nakagawa, Y [1 ]
机构
[1] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan
关键词
critical current density; inductive method; superconducting film; third-harmonic voltage;
D O I
10.1109/TASC.2003.812522
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We have theoretically investigated third-harmonic voltage detected in a widely-used inductive, measurement of critical current density J(c) in superconducting films. In the inductive measurement, an ac drive current I-0 cos omegat flows in a small coil close to the surface of a superconducting film, and third-harmonic, voltage V-3 cos(3omegat + theta(3)) induced in the coil is detected. The relationships among the ac drive current I-0, the amplitude V-3, and the phase theta(3) of the third-harmonic voltage are derived on. the bases of the critical state model. When the drive current is smaller than a threshold value 10, the third-harmonic voltage is near zero, V-3 approximate to 0 for I-0 < I-c0. For I-0 > I-c0, on the other hand, the third-harmonic voltage is expressed as V-3 exp(-itheta(3)) = omegaI(c0)G(3)(I-0/I-c0), where G(3)(gamma) is a scaling function determined by the configuration, of the coil. The predicted scaling law of V-3/I-c0 and theta(3) as functions of I-0/Ic(0) is clearly observed in an YBa2Cu3O7-delta film.
引用
收藏
页码:3710 / 3713
页数:4
相关论文
共 6 条
[1]   MAGNETIZATION OF HARD SUPERCONDUCTORS [J].
BEAN, CP .
PHYSICAL REVIEW LETTERS, 1962, 8 (06) :250-+
[2]  
CLASSEN JH, 1991, REV SCI INSTRUM, V62, P996
[3]   YBCO film deposition on very large areas up to 20x20 cm(2) [J].
Kinder, H ;
Berberich, P ;
Prusseit, W ;
RiederZecha, S ;
Semerad, R ;
Utz, B .
PHYSICA C, 1997, 282 :107-110
[4]  
MAWATARI Y, UNPUB APPL PHYS LETT
[5]  
YAMASAKI H, 2002, ASC 2002
[6]   CRITICAL STATES IN 2D DISK-SHAPED TYPE-II SUPERCONDUCTORS IN PERIODIC EXTERNAL MAGNETIC-FIELD [J].
ZHU, J ;
MESTER, J ;
LOCKHART, J ;
TURNEAURE, J .
PHYSICA C, 1993, 212 (1-2) :216-222