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Phys. Rev. B 76, 140502(R) (2007) [4 pages]

Oxygen isotope effect in Bi2Sr2Can−1CunO2n+4+δ (n=1,2,3) single crystals

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Xiao-Jia Chen1,2,3, Bing Liang3, Clemens Ulrich3, Cheng-Tian Lin3, Viktor V. Struzhkin1, Zhigang Wu1, Russell J. Hemley1, Ho-kwang Mao1, and Hai-Qing Lin4
1Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA
2School of Physics, South China University of Technology, Guangzhou 510641, China
3Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany
4Department of Physics, The Chinese University of Hong Kong, Hong Kong, China

Received 28 August 2007; revised 19 September 2007; published 9 October 2007

We report measurements of the oxygen isotope effect in Bi2Sr2Can−1CunO2n+4+δ (n=1,2,3) single crystals. For optimally doped materials the isotope exponent is found to decrease with increasing the number of CuO2 layers in a manner of inversely correlating with the superconducting transition temperature in this homologous family. This behavior is in contrast to the general belief that the isotope effect can be negligible for the optimally doped cuprates. Our results highlight the important role played by phonons and interlayer coupling in the high-temperature superconductivity.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.76.140502
DOI:
10.1103/PhysRevB.76.140502
PACS:
74.25.Kc, 74.62.Dh, 74.72.−h, 82.20.Tr
 
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