AC PROPERTIES OF NB-NBXOY-PB JOSEPHSON TUNNEL-JUNCTIONS FOR 2E-H MEASUREMENTS

被引:21
作者
LACQUANITI, V [1 ]
MARULLO, G [1 ]
VAGLIO, R [1 ]
机构
[1] UNIV SALERNO,IST FIS,I-84100 SALERNO,ITALY
关键词
D O I
10.1109/TMAG.1979.1060136
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
In order to improve the Italian voltage standard via the Josephson effect at IEN some results have been obtained in the study of the a.c. properties of Nb--Nbx0y-Pb junctions. Our devices, characterized by a very high geometri cal definition, usually exhibit a resonant frequency of about 10.5 GHz with a length in the microwave direction of 0.52 mm. A fine adjustment (better than 0.5) of the resonant frequency of a single junction can be achieved after testing at 4*2 K by means of a photolithographic procedure. This technique makes easier to couple junctions in series with the microwave signal. Some properties of the radiated junctions have been studied by means of “Q” measurements obtained by both the analysis of self—resonant modes behavior and the junction response to a microwave signal. Q values as high as 130 at 4.2 K has been evaluated. The results, also discussed in comparison with data derived from Auger spectroscopy, give interesting information about the influence of the dielectric barrier and its metallic interfaces on the coupling to the microwave. Measurements of 2e/h at.5 mV level have been carried out successfully. © 1979 IEEE
引用
收藏
页码:593 / 594
页数:2
相关论文
共 7 条
  • [1] NOVEL CRYOGENIC VOLTAGE STANDARD
    ANDREONE, D
    ARRI, E
    BOELLA, G
    MARULLO, GC
    [J]. IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, 1976, 25 (04) : 512 - 515
  • [2] CAPACITANCE AND ELLIPSOMETRICALLY DETERMINED OXIDE THICKNESS OF NB-OXIDE-PB JOSEPHSON TUNNEL-JUNCTIONS
    BASAVAIAH, S
    GREINER, JH
    [J]. JOURNAL OF APPLIED PHYSICS, 1976, 47 (09) : 4201 - 4202
  • [3] Q-FACTOR AND RESONANCE AMPLITUDE OF JOSEPHSON TUNNEL-JUNCTIONS
    BROOM, RF
    WOLF, P
    [J]. PHYSICAL REVIEW B, 1977, 16 (07): : 3100 - 3107
  • [4] FINNEGAN, 1976, IC SQUID P, P381
  • [5] SELF-RESONANT MODES IN HIGH-Q JOSEPHSON TUNNEL-JUNCTIONS
    GOU, YS
    GAYLEY, RI
    [J]. PHYSICAL REVIEW B, 1974, 10 (11) : 4584 - 4592
  • [6] PATERNO, 1978, J APPL PHYS, V49, P2456
  • [7] PECH, 1975, IEEE T MAGN, V11, P817