Long-range supercurrents induced by the interference effect of opposite-spin triplet state in clean superconductor-ferromagnet structures

Meng, Hao1,2,3; Wu, Jiansheng1; Wu, Xiuqiang4,5; Ren, Mengyuan6; Ren, Yajie2

2016-07

10.1088/2053-1591/3/7/076003

Materials Research Express   影响因子和分区

2053-1591

By now it is known that in an s-wave superconductor-ferromagnet-superconductor (SFS) structure the supercurrent induced by spin singlet pairs can only transmit a short distance of the order of magnetic coherence length. The long-range supercurrent, taking place on the length scale of the normal metal coherence length, will be maintained by equal-spin triplet pairs, which can be generated by magnetic inhomogeneities in the system. In this paper, we have shown an unusual long-range supercurrent, which can take place in clean SF1F2S junction with non-parallel orientation of magnetic moments. The mechanism behind the enhancement of Josephson current is provided by the interference of the opposite-spin triplet states deriving from S/F-1 and F-2/S interfaces when both ferromagnetic layers have the same values of the length and exchange field. This discovery can offer a natural explanation for recent experiments (Robinson et al 2010 Phys. Rev. Lett. 104 207001; Baek et al 2014 Nat. Commun. 5 3888).

Josephson junctions spin triplet state long range supercurrents interference effect

SCI ; EI

英语

第一 ; 通讯

Shenzhen Foundamental Research Foundation[JCYJ20150630145302225]

Materials Science

Materials Science, Multidisciplinary

WOS:000380852000058

IOP PUBLISHING LTD

20191306679086

Ferromagnetic materials ; Ferromagnetism ; Interface states ; Josephson junction devices ; Magnetic moments ; Magnets ; Shear waves

Magnetism: Basic Concepts and Phenomena:701.2 ; Superconducting Materials:708.3 ; Magnetic Materials:708.4 ; Classical Physics; Quantum Theory; Relativity:931 ; Mechanics:931.1 ; High Energy Physics; Nuclear Physics; Plasma Physics:932

Web of Science

1.South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China
2.Shaanxi Univ Technol, Sch Phys & Telecommun Engn, Hanzhong 723001, Peoples R China
3.Shanghai Univ, Shanghai Key Lab High Temp Superconductors, Shanghai 200444, Peoples R China
4.Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China
5.Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China
6.Harbin Univ Sci & Technol, Sch Mat Sci & Technol, Harbin 150080, Peoples R China

Meng, Hao,Wu, Jiansheng,Wu, Xiuqiang,et al. Long-range supercurrents induced by the interference effect of opposite-spin triplet state in clean superconductor-ferromagnet structures[J]. Materials Research Express,2016,3(7).

Meng, Hao,Wu, Jiansheng,Wu, Xiuqiang,Ren, Mengyuan,&Ren, Yajie.(2016).Long-range supercurrents induced by the interference effect of opposite-spin triplet state in clean superconductor-ferromagnet structures.Materials Research Express,3(7).

Meng, Hao,et al."Long-range supercurrents induced by the interference effect of opposite-spin triplet state in clean superconductor-ferromagnet structures".Materials Research Express 3.7(2016).