Koji Kosuge

TL;DR: Vacuum-ultraviolet reflectance and photoemission spectra of VO{sub 2}, V {sub 2}O{sub 3}, V{sub 6}O {sub 13}, and V{ sub 2} O{sub 5} are measured in order to investigate the 3{ital d}-band structures and electron-correlation effects.

TL;DR: In this article, a triangular Ising spin system is considered to be in a partially disordered antiferromagnetic state for 10 K < T < 25 K and in a ferrimagnetic state below 10 K.

TL;DR: In this paper, the phase relation in the V 2 O 3 −V 2 O 5 system and the homogeneity range of each Magneli phases were re-examined by magnetic and differential thermal analyses, in addition to the usual X-ray analyses.

TL;DR: In this paper, the magnetic properties of Ca 3 Co 2 O 6 with ferromagnetic Ising chains have been studied using oriented sample along the chain direction, and it is suggested that an octahedral Co 3+ is nonmagnetic, whereas a trigonal prismatic Co 3+, has a fictitious spin S '=1 with large single-ion anisotropy (D ∼-25 K, g // ∼4).

TL;DR: An anomalous temperature dependence of Cu nuclear spin-lattice relaxation time T 1 has been observed for both the Cu1 chain and Cu2 plane sites of YBa 2 Cu 3 O 6.91 (T c =90 K).