Abstract
In this chapter we give an overview on some recent experimental results on vortex dynamics in the non-centrosymmetric superconductors \(\hbox{CePt}_3\hbox{Si}\) and \(\hbox{Li}_2\hbox{Pt}_3\hbox{B}\). In both compounds the flux creep from a metastable vortex configuration is anomalously slow—slower than in any other superconductor. Additionally, \(\hbox{Li}_2\hbox{Pt}_3\hbox{B}\) shows very strong avalanche-like flux release after waiting times of several hours at millikelvin temperatures. Since critical currents are also low, the origin of these properties cannot be simply attributed to conventional flux pinning by defects. We speculate that both properties might be connected with crystalline twinning of the samples. We show that twin boundaries in non-centrosymmetric superconductors can host states with broken time reversal symmetry which can carry fractionally quantized flux lines. These flux lines are strongly pinned to the twin boundaries such that they impede the usual flux motion without affecting the critical current.
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Acknowledgements
The authors would like to thank E. Bauer, R. Cardoso, T. Cichorek, C.A. McElroy, M.B. Maple, M. Nicklas, A. Prokofiev, T.A. Sayles, F. Steglich and B.J. Taylor for contributions and discussions. This work was financially supported by the Swiss Nationalfonds, the NCCR MaNEP and the German Research Foundation (DFG).
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Miclea, C.F., Mota, AC., Sigrist, M. (2012). Vortex Dynamics in Superconductors Without Inversion Symmetry. In: Bauer, E., Sigrist, M. (eds) Non-Centrosymmetric Superconductors. Lecture Notes in Physics, vol 847. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-24624-1_10
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