Physics – Condensed Matter – Superconductivity
Scientific paper
2012-02-14
Physics
Condensed Matter
Superconductivity
15 pages, 4 figures
Scientific paper
Recent advances in the study of topological quantum states of matter have provided a big boost for the pursuit of fault-tolerant topological quantum computing based on non-Abelian Majorana fermions. It was predicted that a half-flux-quantum vortex carrying a total flux of {\Phi}0/2 ({\Phi}0 = h/2e, where h is the Planck constant and e the elemental charge), which is expected in a spin-triplet, chiral p-wave superconductor, hosts a non-Abelian Majorana mode. Recent cantilever magnetometry measurements on Sr2RuO4, likely a chiral p-wave superconductor, revealed features suggesting a {\Phi}0/2 flux state. To provide an independent confirmation of the existence of the {\Phi}0/2 state, we pursued electrical transport measurements of quantum oscillations in small Sr2RuO4 loops. Here we report the successful nanofabrication of Sr2RuO4 rings required for such measurements and the observation of a {\Phi}0 quantum oscillation with unexpected large amplitude. However, different from the previous work, clear evidence for a {\Phi}0/2 state was not found.
Cai Xu
Fobes David
Liu Tao
Liu Ya-Ying
Mao Z. Q.
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