Magnetoresistance oscillations and the half-flux-quantum state in spin-triplet superconductor Sr2RuO4

X. Cai; Y. A. Ying; J. E. Ortmann; W. -F. Sun; Z. -Q. Mao; Y. Liu

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arXiv · 1507.00326

Magnetoresistance oscillations and the half-flux-quantum state in spin-triplet superconductor Sr2RuO4

X. Cai·Y. A. Ying·J. E. Ortmann·W. -F. Sun·Z. -Q. Mao·Y. Liu

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Abstract

We report results of our low-temperature magneto electric transport measurements on micron-sized short cylinders of odd-parity, spin-triplet superconductor Sr$_2$RuO$_4$ with the cylinder axis along the $c$ axis. The in-plane magnetic field and measurement current dependent magnetoresistance oscillations were found to feature an amplitude much larger than that expected from the conventional Little-Parks effect, suggesting that the magnetoresistance oscillations originate from vortex crossing. The free-energy barrier that controls the vortex crossing was modulated by the magnetic flux enclosed in the cylinder, the in-plane field, measurement current, and structural factors. Distinct features on magnetoresistance peaks were found, which we argue to be related to the emergence of half-flux quantum states, but only in samples for which the vortex crossing is confined at specific parts of the sample.

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X. Cai, Y. A. Ying, J. E. Ortmann, W. -F. Sun, Z. -Q. Mao, Y. Liu. 2015-07-01. Magnetoresistance oscillations and the half-flux-quantum state in spin-triplet superconductor Sr2RuO4. https://arxiv.org/abs/1507.00326

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