title: Unusual layer-dependent charge distribution, collective mode coupling, and superconductivity in multilayer cuprate Ba2Ca3Cu4O8F2.
abstract: Low energy ultrahigh momentum resolution angle resolved photoemission spectroscopy study on four-layer self-doped high Tc superconductor Ba2Ca3Cu4O8F2 (F0234) revealed fine structure in the band dispersion, identifying the unconventional association of hole and electron doping with the inner and outer CuO2 layers, respectively. For the states originating from two inequivalent CuO2 layers, different energy scales are observed in dispersion kinks associated with the collective mode coupling, with the larger energy scale found in the electron (n-) doped state which also has stronger coupling strength. Given the earlier finding that the superconducting gap is substantially larger along the n-type Fermi surface, our observations connect the mode coupling energy and strength with magnitude of the pairing gap.
authors: SIMES, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
authors: Yulin
authors: Y
authors: Chen
authors: Akira
authors: A
authors: Iyo
authors: Wanli
authors: W
authors: Yang
authors: Akihiro
authors: A
authors: Ino
authors: M
authors: M
authors: Arita
authors: Steve
authors: S
authors: Johnston
authors: Hiroshi
authors: H
authors: Eisaki
authors: H
authors: H
authors: Namatame
authors: M
authors: M
authors: Taniguchi
authors: Thomas P
authors: TP
authors: Devereaux
authors: Zahid
authors: Z
authors: Hussain
authors: Z-X
authors: ZX
authors: Shen