Observation of Spin-Triplet Superconductivity in Co-Based Josephson Junctions

被引：494

作者：

Khaire, Trupti S. ^{[1
]}

Khasawneh, Mazin A. ^{[1
]}

Pratt, W. P., Jr. ^{[1
]}

Birge, Norman O. ^{[1
]}

机构：

[1] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 13期

关键词：

FERROMAGNET STRUCTURES; PROXIMITY; MAGNETORESISTANCE; OSCILLATIONS; MULTILAYERS; FILMS;

D O I：

10.1103/PhysRevLett.104.137002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have measured a long-range supercurrent in Josephson junctions containing Co (a strong ferromagnetic material) when we insert thin layers of either PdNi or CuNi weakly ferromagnetic alloys between the Co and the two superconducting Nb electrodes. The critical current in such junctions hardly decays for Co thicknesses in the range of 12-28 nm, whereas it decays very steeply in similar junctions without the alloy layers. The long-range supercurrent is controllable by the thickness of the alloy layer, reaching a maximum for a thickness of a few nm. These experimental observations provide strong evidence for induced spin-triplet pair correlations, which have been predicted to occur in superconducting-ferromagnetic hybrid systems in the presence of certain types of magnetic inhomogeneity.

引用

页数：4

共 35 条

[1] Measurement of spin memory lengths in PdNi and PdFe ferromagnetic alloys [J].

Arham, H. Z. ;

Khaire, Trupti S. ;

Loloee, R. ;

Pratt, W. P., Jr. ;

Birge, Norman O. .

PHYSICAL REVIEW B, 2009, 80 (17)

[2] Spin-diffusion lengths in metals and alloys, and spin-flipping at metal/metal interfaces: an experimentalist's critical review [J].

Bass, Jack ;

Pratt, William P., Jr. .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2007, 19 (18)

[3]

BEREZINSKII VL, 1974, JETP LETT+, V20, P287

[4] Odd triplet superconductivity and related phenomena in superconductor-ferromagnet structures [J].

Bergeret, FS ;

Volkov, AF ;

Efetov, KB .

REVIEWS OF MODERN PHYSICS, 2005, 77 (04) :1321-1373

[5] Long-range proximity effects in superconductor-ferromagnet structures [J].

Bergeret, FS ;

Volkov, AF ;

Efetov, KB .

PHYSICAL REVIEW LETTERS, 2001, 86 (18) :4096-4099

[6] Observation of antiparallel magnetic order in weakly coupled Co/Cu multilayers [J].

Borchers, JA ;

Dura, JA ;

Unguris, J ;

Tulchinsky, D ;

Kelley, MH ;

Majkrzak, CF ;

Hsu, SY ;

Loloee, R ;

Pratt, WP ;

Bass, J .

PHYSICAL REVIEW LETTERS, 1999, 82 (13) :2796-2799

[7]

BUZDIN AI, 1982, JETP LETT+, V35, P178

[8] Superconducting proximity effects in magnetic metals [J].

Demler, EA ;

Arnold, GB ;

Beasley, MR .

PHYSICAL REVIEW B, 1997, 55 (22) :15174-15182

[9]

Deutscher G., 1969, Superconductivity, vol.2, P1005

[10] Theory of half-metal/superconductor heterostructures -: art. no. 137003 [J].

Eschrig, M ;

Kopu, J ;

Cuevas, JC ;

Schön, G .

PHYSICAL REVIEW LETTERS, 2003, 90 (13) :4

← 1 2 3 4 →