Jaejun Yu

TL;DR: The electronic structure of 5d transition-metal oxide Sr2IrO4 is investigated using angle-resolved photoemission, optical conductivity, x-ray absorption measurements, and first-principles band calculations, suggesting a new class of Jeff quantum spin driven correlated-electron phenomena.

TL;DR: In this paper, the formation mechanism of magnetic moments at the edges of graphitic fragments with various spin and geometric configurations has been investigated, and it has been shown that interedge and interlayer interactions between the localized moments can be explained in terms of the magnetic tails of the edge-localized states.

TL;DR: The addition of divalent metals, i.e., Ba, Sr, suppresses the instability and stabilizes the tetragonal phase where the same soft-phonon branch apparently contributes to a large electron- phonon interaction and a high ${T}_{c}$.

TL;DR: In this article, the electronic structure of the high T c superconductor, YBa 2 Cu 3 O 7-δ, determined from highly precise all-electron local density calculations yields a relatively simple highly 2D electronic band structure consisting of two 2D Cu2-O and two 1D Cu1-O bands (one almost empty and one almost full at δ = 0, becoming full at ≥ 0.1) near E F.

TL;DR: Kim et al. as mentioned in this paper reported various physical properties of (Ba,La)SnO${}_{3}$ single crystals and epitaxial films including temperature-dependent transport and phonon properties, optical properties, and first-principles calculations.