Anomalous proximity effect in underdoped YBa2Cu3O6+x Josephson junctions

被引：54

作者：

Decca, RS ^{[1
]}

Drew, HD

Osquiguil, E

Maiorov, B

Guimpel, J

机构：

[1] Univ Maryland, Phys Sci Lab, College Pk, MD 20742 USA

[2] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

[3] IUPUI, Dept Phys, Indianapolis, IN 46202 USA

[4] Ctr Atom Bariloche, RA-8400 Bariloche, Rio Negro, Argentina

[5] Inst Balseiro, RA-8400 Bariloche, Rio Negro, Argentina

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 85卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.85.3708

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Josephson junctions were photogenerated in underdoped thin films of the YBa2Cu3O6+x family using a near-field scanning optical microscope. The observation of the Josephson effect for separations as large as 100 nm between two wires;indicates the existence of an anomalously large proximity effect and shows that the underdoped insulating material in the gap of the junction is readily perturbed into the superconducting state. The critical current of the junctions was found to be consistent with the conventional Josephson relationship. This result appears to constrain the applicability of SO(5) theory to explain the phase diagram of high critical temperature superconductors.

引用

页码：3708 / 3711

页数：4

共 19 条

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