Abstract Details

Evidence of a High Energy Kink in Electron-doped High Temperature Superconducting Cuprates
Abstract ID	MAT-28
Presenter	Felix  Schmitt
Presentation Type	Poster
Full Author List	F. Schmitt (1) , B. Moritz (5) , W. Meevasana (2) , S. S. Johnston (5) , E. M. Motoyama (1) , M. Greven (1) , C. Kim (6) , R. T. Scalettar (7) , D. H. Lu (3) , Z.-X. Shen (1,3,4) , T. P. Devereaux (5)
Affiliations	(1) Department of Applied Physics, Stanford University, Stanford, CA (2) Department of Physics, Stanford University, Stanford, CA (3) Stanford Synchrotron Radiation Laboratory, Menlo Park, CA (4) Geballe Laboratory of Advanced Materials, Stanford University, Stanford, CA (5) Stanford Linear Accelerator Center, Menlo Park, CA (6) Department of Physics, Yonsei University, Korea (7) University of California, Davis, CA
Category	Materials Science
Abstract	In the hole-doped high temperature superconducting cuprates (HTSCs), the electron dispersion washes out and becomes almost vertical at around ~0.3-0.5eV in the nodal region. This so-called waterfall has received increased attention and its origin is still debated. We present data taken with angle-resolved photoemission spectroscopy on an electron-doped HTSC, NCCO, and show a similar feature as in the hole-doped HTSCs. Light-energy dependent studies, together with a progression of this high-energy feature across the Brillouin zone, lead us to conclude that the "waterfall" is a crossover between the upper Hubbard band and the lower Hubbard band, as shown in the quantum Monte Carlo simulations presented by Moritz et al.
Footnotes
Funding Acknowledgement	The authors acknowledge support from DOE DE-FG03-01ER45929-A001, DOE DE-FC02-06ER25793 (SciDac), DOE DE-AC02-76SF00515, NSF DMR-0705086 and NSERC.