期刊
NPJ QUANTUM MATERIALS
卷 5, 期 1, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41535-020-0245-1
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资金
- Humboldt Foundation
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [258499086 - SFB 1170]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) through the Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter -ct.qmat project [39085490 - EXC 2147]
- National Science Foundation [DMR-1752784]
- NSF at Stanford [DMR- 1608055]
- Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-76SF00515]
A variety of precise experiments have been carried out to establish the character of the superconducting state in Sr2RuO4. Many of these appear to imply contradictory conclusions concerning the symmetries of this state. Here we propose that these results can be reconciled if we assume that there is a near-degeneracy between a d(x2-y2) (B-1g in group theory nomenclature) and a g(xy)(x(2)-y(2))(A(2g)) superconducting state. From a weak-coupling perspective, such an accidental degeneracy can occur at a point at which a balance between the on-site and nearest-neighbor repulsions triggers a d-wave to g-wave transition.
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