Cu-NQR Study for Possible Static Spin-Charge Stripe Order in La_<2-x>Ba_xCuO_4 with x=1/8 : Condensed Matter: Electronic Properties, etc.

概要

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Cu-NQR spectra were measured in the wide temperature range of 300 K to 1.5 K to examine the possibility of the occurrence of the static spin-charge stripe order in La_2-_xBa_xCuO_4 with x = 1/8. The usual NQR spectrum is observed above T_<d2>, the signal intensity decreases rapidly with decreasing temperature, which is accompanied with the abrupt increase of the effective spin echo decay rate, while no significant changes appear in its lineshape down to 10 K. Below 10 K, the spectrum starts to spread and exhibits unusual broadening with a tail to about 80 MHz at 1.5 K. The abnormally broad spectrum at 1.5 K, which is regarded as evidence of the static spin and/or charge order, is simulated satisfactorily in terms of the stripe order proposed for La_<2-x-y>Nd_ySr_xCuO_4 (x =1/8) with the assumption of the modulation amplitude for Cu moment of about 0.24 μ_B.
社団法人日本物理学会の論文
2000-04-15