Coexistence and competition of magnetism and superconductivity on the nanometer scale in underdoped BaFe&lt;sub&gt;1.89&lt;/sub&gt;Co&lt;sub&gt;0.11&lt;/sub&gt;As&lt;sub&gt;2&lt;/sub&gt;

Marsik, P.; Kim, K.W.; Dubroka, A.; Rössle, M.; Malik, V.K.; Schulz, L.; Wang, C.N.; Niedermayer, Ch.; Drew, A.J.; Willis, M.; Wolf, T.; Bernhard, C.

doi:10.1103/PhysRevLett.105.057001

Coexistence and competition of magnetism and superconductivity on the nanometer scale in underdoped BaFe_1.89Co_0.11As₂

Marsik P, Kim KW, Dubroka A, Rössle M, Malik VK, Schulz L, Wang CN, Niedermayer C, Drew AJ, Willis M, Wolf T & Bernhard C

Citation

Marsik, P., Kim, K. W., Dubroka, A., Rössle, M., Malik, V. K., Schulz, L., … Bernhard, C. (2010). Coexistence and competition of magnetism and superconductivity on the nanometer scale in underdoped BaFe_1.89Co_0.11As₂. Physical Review Letters, 105(5), 057001 (4 pp.). https://doi.org/10.1103/PhysRevLett.105.057001

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:15866

We report muon spin rotation (μSR) and infrared spectroscopy experiments on underdoped BaFe_1.89Co_0.11As₂ which show that bulk magnetism and superconductivity (SC) coexist and compete on the nanometer length scale. Our combined data reveal a bulk magnetic order, likely due to an incommensurate spin density wave (SDW), which develops below T^mag≈ 32 K and becomes reduced in magnitude (but not in volume) below T_c = 21.7 K. A slowly fluctuating precursor of the SDW seems to develop already below the structural transition at T_s ≈ 50 K. The bulk nature of SC is established by the μSR data which show a bulk SC vortex lattice and the IR data which reveal that the majority of low-energy states is gapped and participates in the condensate at T ≪ T_c.