期刊
PHYSICAL REVIEW LETTERS
卷 125, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.077001
关键词
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资金
- DOE Basic Energy Sciences [DE-FG02-99ER45790]
- Rutgers Center for Materials Theory postdoctoral fellowship
- U.S. Department of Energy (DOE) [DE-FG02-99ER45790] Funding Source: U.S. Department of Energy (DOE)
A central idea in strongly correlated systems is that doping a Mott insulator leads to a superconductor by transforming the resonating valence bonds (RVBs) into spin-singlet Cooper pairs. Here, we argue that a spin-triplet RVB (tRVB) state, driven by spatially, or orbitally anisotropic ferromagnetic interactions can provide the parent state for triplet superconductivity. We apply this idea to the iron-based superconductors, arguing that strong on site Hund's interactions develop intra-atomic tRVBs between the t(2g) orbitals. On doping, the presence of two iron atoms per unit cell allows these interorbital triplets to coherently delocalize onto the Fermi surface, forming a fully gapped triplet superconductor. This mechanism gives rise to a unique staggered structure of on site pair correlations, detectable as an alternating pi phase shift in a scanning Josephson tunneling microscope.
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