Wang, Chen Nan Marsik, Premysl Schuster, Roman Dubroka, Adam Rössle, Matthias Niedermayer, Ch. Varma, G. D. Wang, A. F. Chen, X. H. Wolf, T. Bernhard, Christian 2012-06-01 Using muon spin rotation and infrared spectroscopy, we investigated the recently discovered superconductor K_0.73Fe_1.67Se₂ with T_c≈32 K. We show that the combined data can be consistently described in terms of a macroscopically phase-segregated state with a matrix of ∼88% volume fraction that is insulating and strongly magnetic and inclusions with an ∼12% volume fraction, which are metallic, superconducting, and nonmagnetic. The electronic properties of the latter, in terms of the normal state plasma frequency and the superconducting condensate density, appear to be similar as in other iron selenide or arsenide superconductors. application/pdf https://folia.unifr.ch/global/documents/302501 https://folia.unifr.ch/documents/302501/files/ber_mps.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.85.214503 info:eu-repo/semantics/openAccess License undefined Physical Review B - Condensed matter and materials physics. - 2012, vol. 85, no. 21, p. 214503 info:eu-repo/classification/udc/53 Macroscopic phase segregation in superconducting K_0.73Fe_1.67Se₂ as seen by muon spin rotation and infrared spectroscopy http://purl.org/coar/resource_type/c_6501