Josephson effect in Nb/Al2O3/Al/MgB2 large-area thin-film heterostructures

被引：41

作者：

Carapella, G ^{[1
]}

Martucciello, N

Costabile, G

Ferdeghini, C

Ferrando, V

Grassano, G

机构：

[1] Univ Salerno, INFM Res Unit, I-84081 Baronissi, Italy

[2] Univ Salerno, Dept Phys, I-84081 Baronissi, Italy

[3] Univ Genoa, Dept Phys, I-16146 Genoa, Italy

[4] Univ Genoa, INFM Res Unit, I-16146 Genoa, Italy

来源：

APPLIED PHYSICS LETTERS | 2002年 / 80卷 / 16期

关键词：

Ac Josephson effect - Conductance spectra - Josephson current - Josephson effect - Microwave-induced - Shapiro steps;

D O I：

10.1063/1.1472470

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report the demonstration of dc and ac Josephson effects in Nb/Al2O3/Al/MgB2 thin-film heterostructure. The heterostructure exhibits moderately hysteretic current-voltage characteristic with a dc Josephson current branch and regular microwave-induced Shapiro steps. From conductance spectrum, a gap of about 2 meV at 7.7 K is estimated for the proximized surface of MgB2 electrode. (C) 2002 American Institute of Physics.

引用

页码：2949 / 2951

页数：3

共 18 条

[1]

[Anonymous], 1982, PHYSICS APPL JOSEPHS

[2] TRANSITION FROM METALLIC TO TUNNELING REGIMES IN SUPERCONDUCTING MICRO-CONSTRICTIONS - EXCESS CURRENT, CHARGE IMBALANCE, AND SUPER-CURRENT CONVERSION [J].

BLONDER, GE ;

TINKHAM, M ;

KLAPWIJK, TM .

PHYSICAL REVIEW B, 1982, 25 (07) :4515-4532

[3] Superconducting quantum interference device based on MgB2 nanobridges [J].

Brinkman, A ;

Veldhuis, D ;

Mijatovic, D ;

Rijnders, G ;

Blank, DHA ;

Hilgenkamp, H ;

Rogalla, H .

APPLIED PHYSICS LETTERS, 2001, 79 (15) :2420-2422

[4]

BURNELL G, 2001, CONDMAT0106562

[5] DIRECT MEASUREMENT OF QUASIPARTICLE-LIFETIME BROADENING IN A STRONG-COUPLED SUPERCONDUCTOR [J].

DYNES, RC ;

NARAYANAMURTI, V ;

GARNO, JP .

PHYSICAL REVIEW LETTERS, 1978, 41 (21) :1509-1512

[6]

FERDEGHINI C, 2001, CONDMAT0107031

[7] Two-gap state density in MgB2:: A true bulk property or a proximity effect?: art. no. 177008 [J].

Giubileo, F ;

Roditchev, D ;

Sacks, W ;

Lamy, R ;

Thanh, DX ;

Klein, J ;

Miraglia, S ;

Fruchart, D ;

Marcus, J ;

Monod, P .

PHYSICAL REVIEW LETTERS, 2001, 87 (17) :177008-1

[8] Josephson effect in MgB2 break junctions -: art. no. 097001 [J].

Gonnelli, RS ;

Calzolari, A ;

Daghero, D ;

Ummarino, GA ;

Stepanov, VA ;

Giunchi, G ;

Ceresara, S ;

Ripamonti, G .

PHYSICAL REVIEW LETTERS, 2001, 87 (09) :970011-970014

[9]

Karapetrov G, 2001, PHYS REV LETT, V86, P4374, DOI 10.1103/PhysRevLett.86.4374

[10]

KOHEN K, 2001, PHYS REV B, V64

← 1 2 →