Anisotropy and multiband superconductivity in Sr2RuO4 determined by small-angle neutron scattering studies of the vortex lattice
| العنوان: | Anisotropy and multiband superconductivity in Sr2RuO4 determined by small-angle neutron scattering studies of the vortex lattice |
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| المؤلفون: | Kuhn, S. J., Morgenlander, W., Louden, E. R., Rastovski, C., Gannon, W. J., Takatsu, H., Peets, D. C., Maeno, Y., Dewhurst, C. D., Gavilano, J., Eskildsen, M. R. |
| المصدر: | Physical Review B. 96 |
| بيانات النشر: | American Physical Society (APS), 2017. |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | Superconductivity (cond-mat.supr-con), Condensed Matter - Superconductivity, Condensed Matter::Superconductivity, 0103 physical sciences, FOS: Physical sciences, 02 engineering and technology, 021001 nanoscience & nanotechnology, 010306 general physics, 0210 nano-technology, 01 natural sciences |
| الوصف: | Despite numerous studies the exact nature of the order parameter in superconducting Sr2RuO4 remains unresolved. We have extended previous small-angle neutron scattering studies of the vortex lattice in this material to a wider field range, higher temperatures, and with the field applied close to both the and basal plane directions. Measurements at high field were made possible by the use of both spin polarization and analysis to improve the signal-to-noise ratio. Rotating the field towards the basal plane causes a distortion of the square vortex lattice observed for H // , and also a symmetry change to a distorted triangular symmetry for fields close to . The vortex lattice distortion allows us to determine the intrinsic superconducting anisotropy between the c-axis and the Ru-O basal plane, yielding a value of ~60 at low temperature and low to intermediate fields. This greatly exceeds the upper critical field anisotropy of ~20 at low temperature, reminiscent of Pauli limiting. Indirect evidence for Pauli paramagnetic effects on the unpaired quasiparticles in the vortex cores are observed, but a direct detection lies below the measurement sensitivity. The superconducting anisotropy is found to be independent of temperature but increases for fields > 1 T, indicating multiband superconductvity in Sr2RuO4. Finally, the temperature dependence of the scattered intensity provides further support for gap nodes or deep minima in the superconducting gap. 14 pages, 8 figures |
| تدمد: | 2469-9969 2469-9950 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bc7a5c39d834c894ab841b978a3f55c0Test https://doi.org/10.1103/physrevb.96.174507Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....bc7a5c39d834c894ab841b978a3f55c0 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 24699969 24699950 |
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