Nonequilibrium superconductivity under spin-polarized quasiparticle currents in perovskite ferromagnet-insulator-superconductor heterostructures

被引:145
作者
Yeh, NC [1 ]
Vasquez, RP
Fu, CC
Samoilov, AV
Li, Y
Vakili, K
机构
[1] CALTECH, Dept Phys, Pasadena, CA 91125 USA
[2] CALTECH, Jet Prop Lab, Ctr Space Microelect Technol, Pasadena, CA 91109 USA
来源
PHYSICAL REVIEW B | 1999年 / 60卷 / 14期
关键词
D O I
10.1103/PhysRevB.60.10522
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We report phenomena manifesting nonequilibrium superconductivity induced by spin-polarized quasiparticles in perovskite ferromagnet-insulator-superconductor (F-I-S) heterostructures. Measurements of the critical current J(c), using a pulsed current technique to minimize Joule heating, reveal a monotonic increase with increasing insulator thickness, and for F-I-S with thin insulating barriers, a slight increase in J(c) is observed under small injection currents I-m from the ferromagnet, followed by a strong suppression of J(c) under large I-m. In contrast, no effect of injection on J(c) can be detected in the N-I-S control sample (N: nonmagnetic metal). The spin diffusion time and length in cuprate superconductors are also estimated and compared with our experimental results. [S0163-1829(99)05638-6].
引用
收藏
页码:10522 / 10526
页数:5
相关论文
共 27 条
[1]   Interface transparency of superconductor/ferromagnetic multilayers [J].
Aarts, J ;
Geers, JME ;
Bruck, E ;
Golubov, AA ;
Coehoorn, R .
PHYSICAL REVIEW B, 1997, 56 (05) :2779-2787
[2]  
ABRIKOSOV AA, 1961, SOV PHYS JETP-USSR, V12, P1243
[4]   Spin-polarized quasiparticle injection devices using Au/YBa2Cu3O7/LaAlO3/Nd0.7Sr0.3/MnO3 heterostructures [J].
Dong, ZW ;
Ramesh, R ;
Venkatesan, T ;
Johnson, M ;
Chen, ZY ;
Pai, SP ;
Talyansky, V ;
Sharma, RP ;
Shreekala, R ;
Lobb, CJ ;
Greene, RL .
APPLIED PHYSICS LETTERS, 1997, 71 (12) :1718-1720
[5]  
Eliashberg G. M., 1970, JETP LETT, V11, P186
[6]  
FULDE P, 1964, PHYS REV A, V135, P550
[7]  
GRAY KE, 1981, NATO ADV STUDY I B, V65
[8]   INTERFACIAL CHARGE-SPIN COUPLING - INJECTION AND DETECTION OF SPIN MAGNETIZATION IN METALS [J].
JOHNSON, M ;
SILSBEE, RH .
PHYSICAL REVIEW LETTERS, 1985, 55 (17) :1790-1793
[9]   THERMODYNAMIC ANALYSIS OF INTERFACIAL TRANSPORT AND OF THE THERMOMAGNETOELECTRIC SYSTEM [J].
JOHNSON, M ;
SILSBEE, RH .
PHYSICAL REVIEW B, 1987, 35 (10) :4959-4972
[10]  
MONTGOMERY H, 1963, BR J APPL PHYS, V141, P525