### Session H21: Superconductivity: Electronic Structure of BSCCO; ARPES and theory

8:00 AM–11:00 AM, Tuesday, February 28, 2012
Room: 254A

Chair: Weiguo Yin, Brookhaven National Lab

Abstract ID: BAPS.2012.MAR.H21.11

### Abstract: H21.00011 : Detecting the minimum gap locus in ARPES spectra of Bi2201

10:00 AM–10:12 AM

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#### Authors:

Makoto Hashimoto
(SSRL, SLAC National Accelerator Lab)

Ruihua He
(Advanced Light Source, Lawrence Berkeley National Lab, Berkeley)

Rob Moore
(SIMES, SLAC and GLAM, Departments Departments of Physics and Applied Physics, Stanford University)

Donghui Lu
(SSRL, SLAC National Accelerator Lab)

Yoshiyuki Yoshida
(Nanoelectronics Research Institute, AIST)

(Japan Atomic Energy Agency)

Hiroshi Eisaki
(Nanoelectronics Research Institute, AIST)

Zahid Hussain
(Advanced Light Source, Lawrence Berkeley National Lab, Berkeley)

Tom Devereaux
(SIMES, SLAC and GLAM, Departments Departments of Physics and Applied Physics, Stanford University)

Zhi-Xun Shen
(SIMES, SLAC and GLAM, Departments Departments of Physics and Applied Physics, Stanford University)

Recent angle-resolved photoemission (ARPES) studies have reported a direct evidence for the competing nature of the pseudogap by showing that the pseudogap dispersion is not tied to Fermi momentum ($k_{F}$)[1,2]. In this study, to get more detailed information on how the competing pseudogap evolves across the pseudogap temperature (T*), we introduce a new analysis method for spectral weight. We found a clear indication that the pseudogap opens at T* with the minimum gap locus deviating from $k_{F}$, which is completely different manner from the gap opening by simple superconductivity, and strongly supports that the pseudogap is another distinct order. [1] M. Hashimoto and R.-H. He {\it et~al.}, Nature Phys. {\bf 6}, 14-418 (2010). [2] R.-H. He and M. Hashimoto {\it et~al.}, Science {\bf 331}, 1579-1583 (2011).

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.MAR.H21.11