A large iron isotope effect in SmFeAsO1 - xF x and Ba1 - xK x Fe2As2

R. H. Liu, T. Wu, G. Wu, H. Chen, X. F. Wang, Y. L. Xie, J. J. Ying, Y. J. Yan, Q. J. Li, B. C. Shi, W. S. Chu, Z. Y. Wu and X. H. Chen ()
Additional contact information
R. H. Liu: University of Science and Technology of China, Hefei, Anhui 230026, China
T. Wu: University of Science and Technology of China, Hefei, Anhui 230026, China
G. Wu: University of Science and Technology of China, Hefei, Anhui 230026, China
H. Chen: University of Science and Technology of China, Hefei, Anhui 230026, China
X. F. Wang: University of Science and Technology of China, Hefei, Anhui 230026, China
Y. L. Xie: University of Science and Technology of China, Hefei, Anhui 230026, China
J. J. Ying: University of Science and Technology of China, Hefei, Anhui 230026, China
Y. J. Yan: University of Science and Technology of China, Hefei, Anhui 230026, China
Q. J. Li: University of Science and Technology of China, Hefei, Anhui 230026, China
B. C. Shi: University of Science and Technology of China, Hefei, Anhui 230026, China
W. S. Chu: Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences
Z. Y. Wu: Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences
X. H. Chen: University of Science and Technology of China, Hefei, Anhui 230026, China

Nature, 2009, vol. 459, issue 7243, 64-67

Abstract: Electron–phonon coupling in oxypnictide superconductors The recent discovery of superconductivity in iron-based oxypnictides with the critical transition temperature (TC) higher than 39 K has generated great excitement. Work to determine the origin of the superconductivity in these compounds has produced contradictory evidence regarding the role of phonons and magnetic fluctuations. Liu et al. now report that the oxygen isotope effect on TC and the spin-density wave transition temperature TSDW is very small, while the iron isotope exponent αC=-dlnTC/dlnM is about 0.35 in the SmFeAsO1−xFx and Ba1−xKxFe2As2 systems. The iron isotope exchange shows the same effect on TSDW as TC. This indicates that electron–phonon interaction plays some role in the superconducting mechanism, but a simple electron–phonon coupling mechanism seems to be rather unlikely because a strong magnon–phonon coupling is included.

Date: 2009
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DOI: 10.1038/nature07981

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