J. Y. Son

Unusual superexchange pathways in an NiS2 triangular lattice with negative charge-transfer energy.

We have studied the electronic structure of the Ni triangular lattice in NiGa(2)S(4) using photoemission spectroscopy and subsequent model calculations. The cluster-model analysis of the Ni 2p core-level spectrum shows that the S 3p to Ni 3d charge-transfer energy is approximately -1 eV and the ground state is dominated by the d(9)L configuration (L is a S 3p hole). Cell perturbation analysis for the NiS(2) triangular lattice indicates that the strong S 3p hole character of the ground state provides the enhanced superexchange interaction between the third-nearest-neighbor sites.

Observation of photoinduced phase transition in phase-separated Pr0.55 (Ca1-y Sry) 0.45 Mn O3 thin films via x-ray photoemission spectroscopy

Perovskite manganite thin films,

Photoemission study of the Laves-phase compounds YMn2 and Y0.97Sc0.03Mn2

{\mathrm{Pr}}_{0.55}{({\mathrm{Ca}}_{1\ensuremath{-}y}{\mathrm{Sr}}_{y})}_{0.45}\mathrm{Mn}{\mathrm{O}}_{3}

Photoemission study of weakly magnetic Y(Co1-xAlx)2

, have been studied using x-ray photoemission spectroscopy in order to clarify the consequence of the competition between ferromagnetic metal (FM) and charge-orbital-ordered insulator (COOI). Films with

Electronic structure of Ca 3CoXO 6 (X=Co, Rh, Ir) studied by x-ray photoemission spectroscopy

y=0.40

X-ray photoemission study of CuIr2S4: Ir3+-Ir4+ charge ordering and the effect of light illumination

undergo a uniform paramagnetic insulator to FM transition. On the other hand, in films with

Photoinduced valence transition in gold complexes Cs2Au2X6 (X=Cl and Br) probed by x-ray photoemission spectroscopy

y=0.25

Photoemission study of R BaCo2 O6-δ (R=Tb, Nd; δ=0.5, 1.0)

, the composition near the bicritical point, phase separation of COOI and FM domains is indicated by the spectral change below

Electronic structure of a V2 O4 (A=Li, Zn, and Cd) studied by x-ray photoemission spectroscopy

125\phantom{\rule{0.3em}{0ex}}\mathrm{K}

Photoemission study of the itinerant-electron helimagnet Fe xCo1-xSi

. Interestingly, between