基于铁磁体的约瑟夫森结中的相敏实验。

Phase sensitive experiments in ferromagnetic-based Josephson junctions.

作者信息

Guichard W, Aprili M, Bourgeois O, Kontos T, Lesueur J, Gandit P

机构信息

CRTBT-CNRS, 25 Avenue des Martyrs, 38042 Grenoble, France.

出版信息

Phys Rev Lett. 2003 Apr 25;90(16):167001. doi: 10.1103/PhysRevLett.90.167001.

DOI:10.1103/PhysRevLett.90.167001

PMID:12731993

Abstract

We have measured the ground state of ferromagnetic Josephson junctions using a single dc SQUID (superconducting quantum interference device).We show that the Josephson coupling is either positive (0 coupling) or negative (pi coupling) depending on the ferromagnetic layer thickness. As expected, the sign change of the Josephson coupling is observed as a shift of half a quantum flux in the SQUID diffraction pattern when operating in the linear limit.

摘要

我们使用单个直流超导量子干涉器件（SQUID）测量了铁磁约瑟夫森结的基态。我们表明，约瑟夫森耦合根据铁磁层厚度要么为正（0耦合）要么为负（π耦合）。正如预期的那样，当在线性极限下操作时，在SQUID衍射图案中观察到约瑟夫森耦合的符号变化表现为半个量子通量的偏移。