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Oxygen K-Edge Fine Structure of Tl 1 Ba 2 Ca n-1 Cu n O 2n+3 Studied by Electron Energy Loss Spectroscopy

1989; Institute of Physics; Volume: 28; Issue: 6A Linguagem: Inglês

10.1143/jjap.28.l955

1347-4065

Daisuke Shindo, Hiroshi Sato, G. L. Liedl, D. Perry, Kenji Hiraga, Makoto Hirabayashi, Satoru Nakajima, Masae Kikuchi, Yasuhiko Syono, K. Hojou, Takeshi Soga,

Iron-based superconductors research

The fine structures of the oxygen K-edge in the Tl 1 Ba 2 Ca n -1 Cu n O 2 n +3 with single Tl-O layers were investigated by electron energy loss spectroscopy (EELS). The peak corresponding to the hole state near the Fermi energy was sensitive to the number of Cu-O layers and the direction of momentum excitation. It was shown that the hole content in Tl 1 Ba 2 Ca n -1 Cu n O 2 n +3 decreases with the increase of n ( n =2–4) and that most holes exist in the O 2p x , y orbitals of 2-dimensional Cu-O planes.