C63uNQR Evidence of Dimensional Crossover to Anisotropic 2D Regime inS=12Three-Leg LadderSr2Cu3O5 Academic Article uri icon

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abstract

  • We probed spin-spin correlations up to 725 K with 63Cu NQR in the S= 1/2 three-leg ladder Sr2Cu3O5. We present experimental evidence that below 300 K, weak inter-ladder coupling causes dimensional crossover of the spin-spin correlation length \xi from quasi-1d (\xi ~ 1/T) to anisotropic 2d regime (\xi \~ exp[2\pi\rho_{s}/T], where 2\pi\rho_{s} = 290 +/- 30 K is the effective spin stiffness). This is the first experimental verification of the renormalized classical behavior of the anisotropic non-linear sigma model in 2d, which has been recently proposed for the striped phase in high T_{c} cuprates.

authors

  • Thurber, KR
  • Imai, Takashi
  • Saitoh, T
  • Azuma, M
  • Takano, M
  • Chou, FC

publication date

  • January 17, 2000