NMR Measurements of Intrinsic Spin Susceptibility in LaFeAsO0.9F0.1 Academic Article uri icon

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abstract

  • We will probe the intrinsic behavior of spin susceptibility chi_(spin) in the LaFeAsO(1-x)F(x) superconductor (x ~ 0.1, Tc ~ 27K) using 19-F and 75-As NMR techniques. Our new results firmly establish the pseudo-gap behavior with Delta_(PG)/kB ~ 140K. The estimated magnitude of chi_(spin) at 290K, ~1.8x10^(-4) [emu/mol-Fe], is approximately twice larger than that in high Tc cuprates. We also show that chi_(spin) levels off below ~50K down to Tc.

authors

  • Imai, Takashi
  • Ahilan, Kanagasingham
  • Ning, Fanlong
  • A. McGuire, Michael
  • S. Sefat, Athena
  • Jin, Ronying
  • C. Sales, Brian
  • Mandrus, David

publication date

  • January 2008