Our ultra-low vibration (ULV) labs are coming online. See below a photo of the almost completed building. We will soon start the first measurements in this bespoke new facility.
New paper: Dirac Surface States and Nature of Superconductivity in Noncentrosymmetric BiPd
Supercondu
ctivity in non-centrosymmetric material promises to be unconventional, the lack of spatial inversion symmetry allows for a triplet component of the order parameter. For various non-centrosymmetric materials, evidence for a triplet component of the order parameter has been put forward.
In this paper, we show that in BiPd superconductivity looks much more conventional when zooming in to the atomic scale by ultra-low temperature scanning tunneling microscopy (STM). What’s more, STM results are consistent with macroscopic characterization by specific heat, whereas electric transport measurements are not – suggesting that electric transport detects signatures from defects in the material rather than being representative of bulk behaviour.
Our measurements further show signatures of Dirac surface states, confirmed by relativistic ab-initio calculations.
Read the full paper at
- Z. Sun, M. Enayat, A. Maldonado, C. Lithgow, E. Yelland, D.C. Peets, A. Yaresko, A.P. Schnyder and P. Wahl, Dirac Surface States and Nature of Superconductivity in Noncentrosymmetric BiPd, Nat. Commun. 6, 6633 (2015) (open), arxiv/1407.5667.
Meet us at the DPG Spring Meeting
Another opportunity to learn more about our work is at the DPG spring meeting in Berlin. We have the following contributions:
- Thursday, March 19, 2015, 16:00–16:30: Peter Wahl: “Correlated Electrons under the Microscope: from Atomic Scale Model Systems to Bulk Materials” in room H 0104
See also work done in collaboration with the Nanoscale Science Department of Prof. Klaus Kern at the Max-Planck-Institute for Solid State Research, Stuttgart, Germany:
- Thursday, March 19, 2015, 16:15–16:30: Verena Schendel: “Reversible long range surface state mediated switching of pentacene derivates” in room MA 043
- Poster: Tuesday, March 17, 2015, 18:15-21:00: Ivan Pentegov: “STM Imaging of Sequence Controlled Polymers”
Meet us at the APS March Meeting
Hear more about our research at the APS march meeting in San Antonio. We have the following contributions:
- Tuesday, March 3, 2015, 11:39 AM–11:51 AM: Peter Wahl: “Real Space Imaging of the Atomic-Scale Magnetic Structure of Fe1+yTe” in room 101AB
- Thursday, March 5, 2015, 12:15 PM–12:27 PM: Ana Maldonado: “Superconductivity in non-centrosymmetric BiPd” in room 203B
- Thursday, March 5, 2015, 12:27 PM–12:39 PM: Jean-Philippe Reid: “Superconducting and normal state properties in Uranium-based materials from thermal and thermoelectric measurements” in room 007B
Also check out contributions from other members of condensed matter physics in St Andrews by Chris Hooley, Phil King, Elliott Levi, Jean-Philippe Reid and Sam Ridgway.
Welcome to our St Andrews site !
The Wahl group is to move soon to St Andrews. See below for an update on the construction works on the St Andrews ultra-low vibration labs.
