Physics – Condensed Matter – Superconductivity
Scientific paper
2006-05-23
Phys. Rev. B 74, 054506 (2006)
Physics
Condensed Matter
Superconductivity
5 pages, 1 figure. Minor changes. Some new references added. Journal-ref. added
Scientific paper
10.1103/PhysRevB.74.054506
Tunnelling between non-centrosymmetric superconductors with significant spin-orbit splitting is studied theoretically in a two-band treatment of the problem. We find that the critical Josephson current may be modulated by changing the relative angle between the vectors describing absence of inversion symmetry on each side of the junction. The presence of two gaps also results in multiple steps in the quasiparticle current-voltage characteristics. We argue that both these effects may help to determine the pairing states in materials like CePt$_3$Si, UIr and Cd$_2$Re$_2$O$_7$. We propose experimental tests of these ideas, including scanning tunnelling microscopy.
Børkje Kjetil
Sudbø Asle
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