Yang K, Agterberg DF
National High Magnetic Field Laboratory and Department of Physics, Florida State University, Tallahassee, Florida 32310, USA.
Phys Rev Lett. 2000 May 22;84(21):4970-3. doi: 10.1103/PhysRevLett.84.4970.
Because of the difference in the momenta of the superconducting order parameters, the Josephson current in a Josephson junction between a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconductor and a conventional BCS superconductor is suppressed. We show that the Josephson current may be recovered by applying a magnetic field in the junction. The field strength and direction at which the supercurrent recovery occurs depend upon the momentum and structure of the order parameter in the FFLO state. Thus the Josephson effect provides an unambiguous way to detect the existence of an FFLO state, and to measure the momentum of the order parameter.
由于超导序参量动量的差异，富尔德 - 费雷尔 - 拉金 - 奥夫钦尼科夫（FFLO）超导体与传统BCS超导体之间的约瑟夫森结中的约瑟夫森电流受到抑制。我们表明，通过在结中施加磁场可以恢复约瑟夫森电流。超电流恢复时的场强和方向取决于FFLO态中序参量的动量和结构。因此，约瑟夫森效应提供了一种明确的方法来检测FFLO态的存在，并测量序参量的动量。
