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Macroscopic phase segregation in superconducting K0.73Fe1.67Se₂ as seen by muon spin rotation and infrared spectroscopy

Wang, Chen Nan ; Maršik, Premysl ; Schuster, Roman ; Dubroka, Adam ; Rössle, Matthias ; Niedermayer, Ch. ; Varma, G. D. ; Wang, A. F. ; Chen, X. H. ; Wolf, T. ; Bernhard, Christian

In: Physical Review B - Condensed matter and materials physics, 2012, vol. 85, no. 21, p. 214503

Using muon spin rotation and infrared spectroscopy, we investigated the recently discovered superconductor K0.73Fe1.67Se₂ with Tc≈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%...