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Phys. Rev. Lett. 101, 157005 (2008) [4 pages]

Isotopic Fingerprint of Electron-Phonon Coupling in High-Tc Cuprates

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H. Iwasawa1,2,*, J. F. Douglas3, K. Sato2,4, T. Masui5, Y. Yoshida2, Z. Sun3, H. Eisaki2, H. Bando2, A. Ino6, M. Arita7, K. Shimada7, H. Namatame7, M. Taniguchi6,7, S. Tajima5, S. Uchida8, T. Saitoh1, D. S. Dessau3, and Y. Aiura2,7,†
1Department of Applied Physics, Tokyo University of Science, Shinjuku-ku, Tokyo 162-8601, Japan
2National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan
3Department of Physics, University of Colorado, Boulder, Colorado 80309-0390, USA
4Faculty of Science, Ibaraki University, Mito, Ibaraki 310-8512, Japan
5Department of Physics, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
6Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
7Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
8Department of Physics, University of Tokyo, Tokyo 113-8656, Japan

Received 16 June 2008; published 9 October 2008

Angle-resolved photoemission spectroscopy with low-energy tunable photons along the nodal direction of oxygen isotope substituted Bi2Sr2CaCu2O8+δ reveals a distinct oxygen isotope shift near the electron-boson coupling “kink” in the electronic dispersion. The magnitude (a few meV) and direction of the kink shift are as expected due to the measured isotopic shift of phonon frequency, and are also in agreement with theoretical expectations. This demonstrates the participation of the phonons as dominant players, as well as pinpointing the most relevant of the phonon branches.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.157005
DOI:
10.1103/PhysRevLett.101.157005
PACS:
74.70.−b, 74.25.Jb, 79.60.−i

*Present address: Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-8526, Japan.

†To whom all correspondence should be addressed.

y.aiura@aist.go.jp

 
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