Observation of half-height magnetization steps in Sr2RuO4

Details Observation of half-height magnetization steps in Sr2RuO4 Observation of half-height magnetization steps in Sr2RuO4

2011-01-19

arxiv.org/abs/1101.3611v1

Science, 331, p. 186 (2011)

Physics

Condensed Matter

Superconductivity

43 pages, 13 figures, 3 tables

Scientific paper

10.1126/science.1193839

Spin-triplet superfluids can support exotic objects, such as half-quantum vortices characterized by the nontrivial winding of the spin structure. We present cantilever magnetometry measurements performed on mesoscopic samples of Sr2RuO4, a spin-triplet superconductor. For micron-sized annular-shaped samples, we observe transitions between integer fluxoid states, as well as a regime characterized by "half-integer transitions," i.e., steps in the magnetization with half the height of the ones we observe between integer fluxoid states. These half-height steps are consistent with the existence of half-quantum vortices in superconducting Sr2RuO4.

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