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Strong Competition of Superconducting and Magnetic Order Parameters in Ba1-xNaxFe2As2

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arxiv 1210.6881 v1 pith:45NTHNZC submitted 2012-10-25 cond-mat.supr-con

Hemke Maeter , Gwendolyne Pascua , Hubertus Luetkens , Johannes Knolle , Saicharan Aswartham , Sabine Wurmehl , Günter Behr , Bernd Büchner
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Zurab Shermadini Kamil Sedlak Alex Amato Roderich Moessner Ilya Eremin Hans-Henning Klauss
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classification cond-mat.supr-con
keywords magneticorderba1-xnaxfe2as2dopedsuperconductingmomentoptimallyordered
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We study the interplay of magnetic and superconducting order in single crystalline hole doped Ba1-xNaxFe2As2 using muon spin relaxation. We find microscopic coexistence of magnetic order and superconductivity. In a strongly underdoped specimen the two forms of order coexist without any measurable reduction of the ordered magnetic moment by superconductivity, while in a nearly optimally doped sample the ordered magnetic moment is strongly suppressed below the superconducting transition temperature. This coupling can be well described within the framework of an effective two-band model incorporating inter- and intra-band interactions. In optimally doped Ba1-xNaxFe2As2 we observe no traces of static or dynamic magnetism and the temperature dependence of the superfluid density is consistent with two s-wave gaps without nodes.

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