Helical vortex phase in the non-centrosymmetric CePt_3Si

Details Helical vortex phase in the non-centrosymmetric CePt_3Si Helical vortex phase in the non-centrosymmetric CePt_3Si

2004-08-06

arxiv.org/abs/cond-mat/0408149v2

Physics

Condensed Matter

Superconductivity

5 pages, 2 figures, Accepted as Phys Rev. Letter

Scientific paper

10.1103/PhysRevLett.94.137002

We consider the role of magnetic fields on the broken inversion superconductor CePt_3Si. We show that upper critical field for a field along the c-axis exhibits a much weaker paramagnetic effect than for a field applied perpendicular to the c-axis. The in-plane paramagnetic effect is strongly reduced by the appearance of helical structure in the order parameter. We find that to get good agreement between theory and recent experimental measurements of H_{c2}, this helical structure is required. We propose a Josephson junction experiment that can be used to detect this helical order. In particular, we predict that Josephson current will exhibit a magnetic interference pattern for a magnetic field applied perpendicular to the junction normal. We also discuss unusual magnetic effects associated with the helical order.

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