Electronic properties of Ba1-xSrx V13 O18 (x=0,0.2,1) studied using hard x-ray photoelectron spectroscopy

S. Dash, M. Okawa, T. Kajita, T. Yoshino, R. Shimoyama, K. Takahashi, Y. Takahashi, R. Takayanagi, T. Saitoh, D. Ootsuki, T. Yoshida, E. Ikenaga, N. L. Saini, T. Katsufuji, T. Mizokawa