<sup><b>139</b></sup>La-NMR Study on La-based High-<i><i>T</i></i><sub><b><i>c</i></b></sub>Cuprates La<sub><b>2-<i><i>x</i></i></b></sub>M<sub><i><i>x</i></i></sub>CuO<sub><b>4</b></sub>(M=Sr, Ba) around<i><i>x</i></i>=0.115 under High Magnetic Field

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  • Goto Takayuki
    Institute for Material Research, Tohoku University, 2–1–1 , Katahira, Sendai 980–77
  • Chiba Kaichiro
    Institute for Material Research, Tohoku University, 2–1–1 , Katahira, Sendai 980–77
  • Mori Masakatsu
    Institute for Material Research, Tohoku University, 2–1–1 , Katahira, Sendai 980–77
  • Suzuki Takao
    Institute for Material Research, Tohoku University, 2–1–1 , Katahira, Sendai 980–77
  • Seki Katsutoshi
    Institute for Material Research, Tohoku University, 2–1–1 , Katahira, Sendai 980–77
  • Fukase Tetsuo
    Institute for Material Research, Tohoku University, 2–1–1 , Katahira, Sendai 980–77

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タイトル別名
  • 139La-NMR Study on La-based High-Tc Cuprates La2-xMxCuO4 (M=Sr, Ba) around x=0.115 under High Magnetic Field.
  • 139La-NMR Study on La-based High Tc Cup

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説明

The effect of the external field on La-NMR spectra has been studied on La-based high-Tc cuprates La2-xSrxCuO4(x≈ 0.115) and La2-xBaxCuO4(x=0.125), where the magnetic ordering in Cu-3d spin exists at low temperature. In the magnetically ordered state, the broadening in the resonance line was observed, reflecting the hyperfine field at the La-site contributed by the Cu-3d spins. By applying a high magnetic field of 15 T, this broadening in La2-xSrxCuO4 showed a significant shrink, which is interpreted as the spin-flop in the canted-spin system with the Dzyaloshinski-Moriya interaction. A model is proposed to explain both this spin-flop and the previously-reported anomalous field dependence of the structural instability in this system.

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