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Phys. Rev. Lett. 83, 3709–3712 (1999)

Electronic Spectra and Their Relation to the (π,π) Collective Mode in High- Tc Superconductors

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J. C. Campuzano1,2, H. Ding3, M. R. Norman2, H. M. Fretwell1, M. Randeria4, A. Kaminski1, J. Mesot2, T. Takeuchi5, T. Sato6, T. Yokoya6, T. Takahashi6, T. Mochiku7, K. Kadowaki8, P. Guptasarma2, D. G. Hinks2, Z. Konstantinovic9, Z. Z. Li9, and H. Raffy9
1Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607
2Materials Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439
3Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467
4Tata Institute of Fundamental Research, Mumbai 400005, India
5Department of Crystalline Materials Science, Nagoya University, Nagoya 464-01, Japan
6Department of Physics, Tohoku University, 980-8578 Sendai, Japan
7National Research Institute for Metals, Sengen, Tsukuba, Ibaraki 305, Japan
8Institute of Materials Science, University of Tsukuba, Ibaraki 305, Japan
9Laboratoire de Physique des Solides, Universite de Paris-Sud, 91405 Orsay Cedex, France

Received 22 June 1999; published in the issue dated 1 November 1999

The photoemission line shape near (π,0) in Bi2Sr2CaCu2O8+δ below Tc is characterized by a sharp peak, followed at higher energy by a dip and hump. We study the evolution of this line shape as a function of momentum, temperature, and doping. We find the hump scales with the peak and persists above Tc in the pseudogap state. We present strong evidence that the peak-dip-hump structure arises from the interaction of electrons with a collective mode of wave vector (π,π). The inferred mode energy and its doping dependence agree well with a magnetic resonance observed by neutron scattering.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.3709
DOI:
10.1103/PhysRevLett.83.3709
PACS:
74.25.Jb, 71.18.+y, 74.72.Hs, 79.60.Bm
 
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