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arxiv 0808.2738 v1 pith:MFUMRSHL submitted 2008-08-20 cond-mat.supr-con cond-mat.str-el

Correlation effects of exchange splitting and coexistence of spin-density-wave and superconductivity in single crystalline Sr1-xKxFe2As2

Y. Zhang , J. Wei , H. W. Ou , J. F. Zhao , B. Zhou , F. Chen , M. Xu , C. He
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G. Wu H. Chen M. Arita K. Shimada H. Namatame M. Taniguchi X. H. Chen D. L. Feng
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classification cond-mat.supr-con cond-mat.str-el
keywords superconductivitycrystallineexchangesinglesplittingsr1-xkxfe2as2superconductingwave
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The nature of spin-density wave and its relation with superconductivity are crucial issues in the newly discovered Fe-based high temperature superconductors. Particularly it is unclear whether the superconducting phase and spin density wave (SDW) are truly exclusive from each other as suggested by certain experiments. With angle resolved photoemission spectroscopy, we here report exchange splittings of the band structures in Sr1-xKxFe2As2 (x=0,0.1,0.2), and the non-rigid-band behaviors of the splitting. Our data on single crystalline superconducting samples unambiguously prove that SDW and superconductivity could coexist in iron-pnictides.

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