title: Anomalous switching in Nb/Ru/Sr₂RuO₄ topological junctions by chiral domain wall motion.
abstract: A spontaneous symmetry breaking in a system often results in domain wall formation. The motion of such domain walls is utilized to realize novel devices like racetrack-memories, in which moving ferromagnetic domain walls store and carry information. Superconductors breaking time reversal symmetry can also form domains with degenerate chirality of their superconducting order parameter. Sr₂RuO₄ is the leading candidate of a chiral p-wave superconductor, expected to be accompanied by chiral domain structure. Here, we present that Nb/Ru/Sr₂RuO₄ topological superconducting-junctions, with which the phase winding of order parameter can be effectively probed by making use of real-space topology, exhibit unusual switching between higher and lower critical current states. This switching is well explained by chiral-domain-wall dynamics. The switching can be partly controlled by external parameters such as temperature, magnetic field and current. These results open up a possibility to utilize the superconducting chiral domain wall motion for future novel superconducting devices.
authors: Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
authors: M S
authors: MS
authors: Anwar
authors: Taketomo
authors: T
authors: Nakamura
authors: S
authors: S
authors: Yonezawa
authors: M
authors: M
authors: Yakabe
authors: R
authors: R
authors: Ishiguro
authors: H
authors: H
authors: Takayanagi
authors: Y
authors: Y
authors: Maeno
mesh_terms: D000497:Alloys / Q000737:chemistry*; D003198:Computer Simulation; D004553:Electric Conductivity; D008670:Metals / Q000737:chemistry*; D008956:Models, Chemical; D008958:Models, Molecular
chemical_list: D000497:Alloys; D008670:Metals
references: Phys Rev Lett. 2006 Oct 20;97(16):167002
references: 17155427
references: Rep Prog Phys. 2012 Jul;75(7):076501
references: 22790778
references: Science. 2004 Nov 12;306(5699):1151-4
references: 15539595
references: Science. 2011 Jan 14;331(6014):186-8
references: 21233380
references: Phys Rev Lett. 2011 Aug 12;107(7):077003
references: 21902420
references: Science. 2006 Nov 24;314(5803):1267-71
references: 17068225
references: Phys Rev Lett. 2008 Dec 31;101(26):267003
references: 19437663
references: Science. 2008 Apr 11;320(5873):190-4
references: 18403702