Doping dependence of the electron–phonon and electron–spin fluctuation interactions in the high-Tc superconductor Bi2Sr2CaCu2O8+δ

E E M Chia; D Springer; S K Nair; X Q Zou; S A Cheong; C Panagopoulos; T Tamegai; H Eisaki; S Ishida; S Uchida; A J Taylor; J-X Zhu

doi:10.1088/1367-2630/15/10/103027

New Journal of Physics (Jan 2013)

Doping dependence of the electron–phonon and electron–spin fluctuation interactions in the high-Tc superconductor Bi2Sr2CaCu2O8+δ

E E M Chia,
D Springer,
S K Nair,
X Q Zou,
S A Cheong,
C Panagopoulos,
T Tamegai,
H Eisaki,
S Ishida,
S Uchida,
A J Taylor,
J-X Zhu

Affiliations

E E M Chia: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 637371, Singapore
D Springer: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 637371, Singapore
S K Nair: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 637371, Singapore
X Q Zou: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 637371, Singapore
S A Cheong: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 637371, Singapore
C Panagopoulos: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 637371, Singapore; Department of Physics, University of Crete and FORTH , 71003 Heraklion, Greece
T Tamegai: Department of Applied Physics, University of Tokyo , Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
H Eisaki: National Institute of Advanced Industrial Science and Technology , Tsukuba 305-8568, Japan
S Ishida: Department of Physics, University of Tokyo , Bunkyo-ku, Tokyo 113-0033, Japan
S Uchida: Department of Physics, University of Tokyo , Bunkyo-ku, Tokyo 113-0033, Japan
A J Taylor: Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
J-X Zhu: Theoretical Division and Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM 87545, USA

DOI: https://doi.org/10.1088/1367-2630/15/10/103027
Journal volume & issue: Vol. 15, no. 10
p. 103027

Abstract

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Using ultrafast optical techniques, we detect two types of bosons strongly coupled to electrons in the family of Bi _2 Sr _2 CaCu _2 O _8+ _δ (Bi-2212) from the underdoped to overdoped regimes. The different doping dependences of the electron–boson coupling strengths enable us to identify them as phonons and spin fluctuations: electron–phonon coupling ( λ _e−ph ) peaks at optimal doping, while electron–spin fluctuation coupling ( λ _e−sf ) decreases monotonically with doping. This observation is consistent with two facts: (i) superconductivity is in close proximity with antiferromagnetism at low dopings and (ii) a pronounced lattice renormalization effect at larger dopings.

Published in New Journal of Physics

ISSN: 1367-2630 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Science: Physics
Website: https://iopscience.iop.org/journal/1367-2630

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