Unusual Layer-Dependent Charge Distribution, Collective Mode Coupling, and Superconductivity in Multilayer Cuprate Ba2Ca3Cu4O8F2

Chen Yulin

Iyo Akira

Yang Wanli

Ino Akihiro

Arita Masashi

Johnston Steve

Eisaki Hiroshi

Namatame Hirofumi

Taniguchi Masaki

Devereaux Thomas P

Hussain Zahid

Shen Z -X

Physical Review Letters

Low energy ultrahigh momentum resolution angle resolved photoemission spectroscopy study on four-layer self-doped high T-c 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.

Physics [ 420 ]

eng

Amer Physical Soc

Copyright (c) 2009 American Physical Society.

[ISSN] 0031-9007

[DOI] 10.1103/PhysRevLett.103.036403

[NCID] AA00773679

[DOI] http://dx.doi.org/10.1103/PhysRevLett.103.036403