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Change of the charge modulation during superconducting transition in SmFeAsO(0.91)F(0.09) seen by 57Fe Mössbauer spectroscopy

Iron-based superconductor SmFeAsO(0.91)F(0.09) has been investigated by the 57Fe Moessbauer spectroscopy versus temperature with the special attention paid to the region of the superconducting transition at about 47 K. Modulation of the electron charge density was found. It leads to the development of the charge density wave (CDW) and electric field gradient wave (EFGW). The modulation of CDW is enhanced in the temperature region of the superconducting gap opening, while the amplitude of EFGW is partly suppressed within this temperature region. This effect is exactly opposite to the similar effect in Ba(0.6)K(0.4)Fe2As2 superconductor. Hence, it seems that d electrons contribute significantly to the Cooper pair formation in both compounds as EFGW is perturbed within the temperature region of the superconducting gap formation.

preprint2015arXivOpen access
A. K. JasekK. KomederaA. BlachowskiK. RuebenbauerH. LochmajerN. D. ZhigadloK. Rogacki
cond-mat.supr-concond-mat.str-el
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Open access7 authors2 topics
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A. K. JasekK. KomederaA. BlachowskiK. RuebenbauerH. LochmajerN. D. ZhigadloK. Rogacki

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