Electronic correlation in the quasi-two-dimensional electride Y$_2$C
Abstract
Magnetic properties of the electride compound YC were investigated by muon spin rotation and magnetic susceptibility on two samples with different form (poly- and single-crystalline), to examine the theoretically-predicted Stoner ferromagnetism for the electride bands. There was no evidence of static magnetic order in both samples even at temperatures down to 0.024 K. For the poly-crystalline sample, the presence of a paramagnetic moment at 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 YC is at the limit between weak-to-strong electronic correlation, where onsite 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/impurities.
Cite
@article{arxiv.1806.11260,
title = {Electronic correlation in the quasi-two-dimensional electride Y$_2$C},
author = {M. Hiraishi and K. M. Kojima and I. Yamauchi and H. Okabe and S. Takeshita and A. Koda and R. Kadono and X. Zhang and S. Matsuishi and H. Hosono and K. Hirata and S. Otani and N. Ohashi},
journal= {arXiv preprint arXiv:1806.11260},
year = {2018}
}