Abstract
The layered perovskite superconductor Sr2RuO4 (T c = 1.5 K) has attracted much research interest, particularly because of its unconventional superconductivity. From the NMR Knight shift, as well as from the polarized neutron scattering, the spin wave function is most likely triplet with a vector order parameter pointing to the z direction (with paired parallel spins lying within the RuO2 plane). However, the orbital wave function, which determines the gap symmetry, has not been so well established yet. The remaining problems towards the full characterization of the superconducting order parameter of Sr2RuO4 will be presented and possible means of resolving them will be discussed. In view of these, we will highlight the following problems: (1) location of the line nodes; (2) mechanism of the strong suppression of the upper critical field; (3) origin of the two superconducting phases.
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Maeno, Y., Yaguchi, H., Deguchi, K. (2002). Toward the Full Determination of the Superconducting Order Parameter of Sr2RuO4 . In: Noce, C., Vecchione, A., Cuoco, M., Romano, A. (eds) Ruthenate and Rutheno-Cuprate Materials. Lecture Notes in Physics, vol 603. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45814-X_1
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DOI: https://doi.org/10.1007/3-540-45814-X_1
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