ULTRA-HIGH QUALITY NB/ALOX/NB TUNNEL-JUNCTIONS WITH EPITAXIAL BASE LAYERS

被引：13

作者：

KIRK, ECG ^{[1
]}

BLAMIRE, MG ^{[1
]}

SOMEKH, RE ^{[1
]}

EVETTS, JE ^{[1
]}

VANVECHTEN, D ^{[1
]}

LOVELLETTE, MN ^{[1
]}

机构：

[1] USN,RES LAB,WASHINGTON,DC 20375

来源：

IEEE TRANSACTIONS ON MAGNETICS | 1991年 / 27卷 / 02期

关键词：

D O I：

10.1109/20.133876

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：

Using an ultra-high vacuum DC sputtering system we have fabricated Nb/AlO(x)/Nb tunnel junction devices with epitaxial Nb base layers. We have been investigating the improvements in device quality which can be achieved by heating the substrates during the growth of the tunnel barrier. By measuring the subgap characteristic under magnetic field at temperatures down to 0.4K, we show that for V < DELTA-Nb the currents in devices with critical current densities in the range 10(5)-10(6)Am-2 follow closely the BCS prediction and show no extrinsic leakage current. The divergence of the curve for higher current densities and at higher voltages is discussed.

引用

页码：3137 / 3140

页数：4

共 15 条

[1] MICROSTRUCTURE EFFECTS ON ELECTRONIC-PROPERTIES OF NB/AL2O3/NB TUNNEL-JUNCTIONS
BLAMIRE, MG
SOMEKH, RE
BARBER, ZH
MORRIS, GW
EVETTS, JE
[J]. JOURNAL OF APPLIED PHYSICS, 1988, 64 (11) : 6396 - 6405
[2] EFFECTS OF FABRICATION CONDITIONS ON THE PROPERTIES OF SIS TUNNEL-JUNCTIONS
BLAMIRE, MG
SOMEKH, RE
LUMLEY, JM
MORRIS, GW
BARBER, ZH
EVETTS, JE
[J]. JOURNAL OF PHYSICS D-APPLIED PHYSICS, 1987, 20 (09) : 1159 - 1167
[3] OBSERVATION OF TUNNELING ANISOTROPY IN SUPERCONDUCTING NIOBIUM CRYSTALS
DURBIN, SM
BUCHANAN, DS
CUNNINGHAM, JE
GINSBERG, DM
[J]. PHYSICAL REVIEW B, 1983, 28 (11): : 6277 - 6280
[4] FABRICATION AND DC CHARACTERISTICS OF SMALL-AREA TANTALUM AND NIOBIUM SUPERCONDUCTING TUNNEL-JUNCTIONS
FACE, DW
PROBER, DE
[J]. JOURNAL OF APPLIED PHYSICS, 1987, 62 (08) : 3257 - 3266
[5] FISKE MD, 1964, REV MOD PHYS, P221
[6] PREPARATION AND PROPERTIES OF NB JOSEPHSON-JUNCTIONS WITH THIN AL LAYERS
GURVITCH, M
WASHINGTON, MA
HUGGINS, HA
ROWELL, JM
[J]. IEEE TRANSACTIONS ON MAGNETICS, 1983, 19 (03) : 791 - 794
[7] HASSELBERG LE, 1974, PHYS REV B, V9, P3753
[8] KROGER H, 1981, APPL PHYS LETT, V40, P436
[9] X-RAY PHOTOEMISSION SPECTROSCOPY STUDY OF SURFACE OXIDATION OF NB/AL OVERLAYER STRUCTURES
KWO, J
WERTHEIM, GK
GURVITCH, M
BUCHANAN, DNE
[J]. APPLIED PHYSICS LETTERS, 1982, 40 (08) : 675 - 677
[10] STRUCTURE AND COHERENCE OF NBAL MULTILAYER FILMS
MCWHAN, DB
GURVITCH, M
ROWELL, JM
WALKER, LR
[J]. JOURNAL OF APPLIED PHYSICS, 1983, 54 (07) : 3886 - 3891

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