<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>Bernhard, Christian</dc:creator>
  <dc:creator>Drew, Alan J.</dc:creator>
  <dc:creator>Schulz, Leander</dc:creator>
  <dc:creator>Malik, Vivek Kumar</dc:creator>
  <dc:creator>Rössle, Matthias</dc:creator>
  <dc:creator>Niedermayer, Ch.</dc:creator>
  <dc:creator>Wolf, Th.</dc:creator>
  <dc:creator>Varma, G. D.</dc:creator>
  <dc:creator>Mu, G.</dc:creator>
  <dc:creator>Wen, H.-H.</dc:creator>
  <dc:creator>Liu, H.</dc:creator>
  <dc:creator>Wu, G.</dc:creator>
  <dc:creator>Chen, X. H.</dc:creator>
  <dc:date>2009-05-19</dc:date>
  <dc:description xmlns:ns0="xml" ns0:lang="en">We present a muon spin rotation (μSR) study of the magnetic and superconducting properties of single crystals of electron-doped BaFe&lt;sub&gt;2−&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;Co&lt;sub&gt;&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;As₂ with &lt;i&gt;x&lt;/i&gt; = 0.08, 0.20 and 0.25 (&lt;i&gt;T&lt;/i&gt;&lt;sub&gt;c&lt;/sub&gt; = 9, 25 and 20 K) and of polycrystalline hole-doped Pr&lt;sub&gt;1−&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;Sr&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt;FeAsO with &lt;i&gt;x&lt;/i&gt; = 0 and 0.2 (&lt;i&gt;T&lt;/i&gt;&lt;sub&gt;c&lt;/sub&gt; = 15 K). In the former series, we observe some interesting parallels with the electron-doped SmFeAsO&lt;sub&gt;1−&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;F&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt; 1111-type system (Drew &lt;i&gt;et al&lt;/i&gt; 2009 &lt;i&gt;Nat. Mater.&lt;/i&gt; &lt;b&gt;8&lt;/b&gt; 310). In particular, we obtain evidence that strongly disordered static magnetism coexists with superconductivity on a microscopic scale in underdoped samples and even at optimum doping there is a slowing down (or enhancement) of dynamic magnetic correlations below &lt;i&gt;T&lt;/i&gt;&lt;sub&gt;c&lt;/sub&gt;≈25 K. In contrast, for the hole-doped Pr&lt;sub&gt;1−&lt;/sub&gt;&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt;Sr&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt;FeAsO samples we obtain evidence for a mesoscopic phase segregation into regions with nearly unperturbed antiferromagnetic (AF) order and others that are non-magnetic and most likely superconducting. The observed trend resembles the one that was previously reported for hole-doped Ba&lt;sub&gt;1−&lt;/sub&gt;&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt;K&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt;Fe₂As₂ (Aczel &lt;i&gt;et al&lt;/i&gt; 2008 &lt;i&gt;Phys. Rev.&lt;/i&gt; B &lt;b&gt;78&lt;/b&gt; 214503, Park &lt;i&gt;et al&lt;/i&gt; 2009 &lt;i&gt;Phys. Rev. Lett.&lt;/i&gt; &lt;b&gt;102&lt;/b&gt; 117006) and thus might be a common property of the hole-doped systems.</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>https://folia.unifr.ch/global/documents/301204</dc:identifier>
  <dc:identifier>https://folia.unifr.ch/documents/301204/files/bernahrd_msr.pdf</dc:identifier>
  <dc:language>eng</dc:language>
  <dc:relation>info:eu-repo/semantics/altIdentifier/doi/10.1088/1367-2630/11/5/055050</dc:relation>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>License undefined</dc:rights>
  <dc:source>New Journal of Physics. - 2009, vol. 11, p. 055050</dc:source>
  <dc:subject xmlns:ns1="xml" ns1:lang="en">Superconductivity</dc:subject>
  <dc:subject>info:eu-repo/classification/udc/53</dc:subject>
  <dc:title xmlns:ns2="xml" ns2:lang="en">Muon spin rotation study of magnetism and superconductivity in BaFe&lt;sub&gt;2−&lt;/sub&gt;&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt;Co&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt;As₂ and Pr&lt;sub&gt;1−&lt;/sub&gt;&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt;Sr&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt;FeAsO</dc:title>
  <dc:type>http://purl.org/coar/resource_type/c_6501</dc:type>
</oai_dc:dc>