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Electronic correlation in the quasi-two-dimensional electride
Phys. Rev. B 98, 041104(R) – Published 17 July, 2018
DOI: https://doi.org/10.1103/PhysRevB.98.041104
Abstract
The magnetic properties of the electride compound were investigated by muon spin rotation and magnetic susceptibility on two samples with different forms (polycrystalline and single crystalline), to examine the theoretically predicted Stoner ferromagnetism for electride bands. There was no evidence of static magnetic order in both samples even at temperatures down to 0.024 K. For the polycrystalline sample, the presence of a paramagnetic moment at the Y sites was inferred from the Curie-Weiss behavior of the muon Knight shift and susceptibility, whereas no such tendency was observed in the single-crystalline sample. These observations suggest that the electronic ground state of is at the limit between weak-to-strong electronic correlation, where on-site Coulomb repulsion is sensitive to a local modulation of the electronic state or a shift in the Fermi level due to the presence of defects and/or impurities.