Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session K13: Sr2RuO4 and Chiral Topological Superconductivity
8:00 AM–10:48 AM,
Wednesday, March 7, 2018
LACC Room: 304A
Sponsoring Unit: DMP
Chair: Timo Hyart, Univ of Jyvaskyla
Abstract: K13.00002 : Half-quantum fluxoid features in the magnetotransport of Sr2RuO4 micro rings
8:36 AM–8:48 AM
Muhammad Shahbaz Anwar
(University College London)
Sr2RuO4 is a leading candidate for spin-triplet superconductors with an equal-spin pairing state. For such a state, an unusual fluxoid state, the half-quantum fluxoid (HQF), can be realized because the Cooper pairs have an additional degree of freedom in its superconducting order parameter. Although the observation of HQF in Sr2RuO4 micro rings using magnetic torque has been reported , detection with other experimental technique is still desired .
Our goal is to observe possible HQF using magnetoresistance measurements to reproduce the first discovery as well as to try to utilize the phenomenon for research toward manipulation of Majorana quasiparticles. We fabricated micro rings of Sr2RuO4 using the focused ion beam technique and observed magnetoresistance oscillations that show good agreement with theoretical simulations for the Little-Parks oscillations. With careful analysis of the data, features that can be attributed to HQF were observed under additional in-plane magnetic fields .
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 X. Cai et al., Phys. Rev. B 87, 081104(R) (2013).
 Y. Yasui et al., Phys Rev. B (R) (2017); arXiv:1710.11348.
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