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Electron-hole asymmetry in Co- and Mn-doped SrFe2As2

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arxiv 1004.0659 v1 pith:XRBGRZTA submitted 2010-04-05 cond-mat.supr-con cond-mat.str-el

Electron-hole asymmetry in Co- and Mn-doped SrFe2As2

J. S. Kim , Seunghyun Khim , H. J. Kim , M. J. Eom , J. Law , R. K. Kremer , Ji Hoon Shim , Kee Hoon Kim This is my paper
classification cond-mat.supr-con cond-mat.str-el
keywords dopingsrfe2as2absenceelectronelectron-holehole-dopedmn-dopingphase
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Phase diagram of electron and hole-doped SrFe2As2 single crystals is investigated using Co and Mn substitution at the Fe-sites. We found that the spin-density-wave state is suppressed by both dopants, but the superconducting phase appears only for Co (electron)-doping, not for Mn (hole)-doping. Absence of the superconductivity by Mn-doping is in sharp contrast to the hole-doped system with K-substitution at the Sr sites. Distinct structural change, in particular the increase of the Fe-As distance by Mn-doping is important to have a magnetic and semiconducting ground state as confirmed by first principles calculations. The absence of electron-hole symmetry in the Fe-site-doped SrFe2As2 suggests that the occurrence of high-Tc superconductivity is sensitive to the structural modification rather than the charge doping.

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