Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 2: Superconductivity: Properties and Electronic Structure 1
TT 2.2: Vortrag
Montag, 20. März 2017, 09:45–10:00, HSZ 103
Unexpected rotation of the vortex lattice in the noncentrosymmetric superconductor Ru7B3 — •Alistair Cameron1, Yuliia Tymoshenko1, Yevhen Onykiienko1, Aleksandr Sukhanov1, Geetha Balakrishnan2, Monica C. Hatnean2, Don McK. Paul2, and Dmytro Inosov1 — 1Institut für Festkörperphysik, Technische Universität Dresden, Germany — 2Department of Physics, University of Warwick, Coventry, United Kingdom
Superconductivity in a non-centrosymmetric (NCS) system was first observed in the heavy-fermion compound CePt3Si. This has led to a great deal of interest, as parity is no longer a conserved quantity in a NCS superconductor, leading to a superposition of s-wave and p-wave states. The electronic states around a vortex are strongly influenced by the s+p-wave order parameter, resulting in an anisotropic vortex, which can express itself in the bulk vortex lattice (VL) structure.
We have performed measurements of the VL in the NCS superconductor Ru7B3 using small angle neutron scattering. We observe an unusual rotation of the VL with respect to the crystal lattice with changing magnetic field. Normally, a VL selects a single orientation and coordination at any particular magnetic field. However, when changing field below Tc the VL in Ru7B3 rotates to a new orientation, dependent not on the absolute field but on the change in field. It is possible that this is due to the Magnus force. However, this is universal to all type-II superconductors, whereas the rotation we observe has not been reported before despite decades of research into vortex matter. We therefore cannot rule out a more exotic origin for our observations.