Journal
SCIENCE
Volume 331, Issue 6014, Pages 186-188Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1193839
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- U.S. Department of Energy Office of Basic Sciences through the Frederick Seitz Materials Research Laboratory at the University of Illinois at Urbana Champaign [DEFG02-07ER46453]
- Ministry of Education, Culture, Sports, Science and Technology of Japan
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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. With micrometer-sized annular-shaped samples, we observed transitions between integer fluxoid states as well as a regime characterized by half-integer transitions-steps in the magnetization with half the height of the ones we observed between integer fluxoid states. These half-height steps are consistent with the existence of half-quantum vortices in superconducting Sr2RuO4.
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