Muon-spin-relaxation studies of magnetic order and superfluid density in antiferromagnetic NdFeAsO,BaFe2As2, and superconductingBa1−xKxFe2As2 Academic Article uri icon

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abstract

  • Zero-field (ZF) muon spin relaxation ($\mu$SR) measurements have revealed static commensurate magnetic order of Fe moments in NdOFeAs below $T_{N} \sim 135$ K, with the ordered moment size nearly equal to that in LaOFeAs, and confirmed similar behavior in BaFe$_{2}$As$_{2}$. In single crystals of superconducting (Ba$_{0.55}$K$_{0.45}$)Fe$_{2}$As$_{2}$, $\mu$SR spectra indicate static magnetism with incommensurate or short-ranged spin structure in $\sim$ 70 % of volume below $T_{N} \sim$ 80 K, coexisting with remaining volume which exhibits superfluid-response consistent with nodeless gap below $T_{c}\sim 30$ K.

authors

  • Aczel, AA
  • Baggio-Saitovitch, E
  • Budko, SL
  • Canfield, PC
  • Carlo, JP
  • Chen, GF
  • Dai, Pengcheng
  • Goko, T
  • Hu, WZ
  • Luke, Graeme
  • Luo, JL
  • Ni, N
  • Sanchez-Candela, DR
  • Tafti, FF
  • Wang, NL
  • Williams, TJ
  • Yu, W
  • Uemura, YJ

publication date

  • December 1, 2008