^<63/65>Cu/^<139>La-NMR Study on Antiferromagnetic Ordering in High-T_c Oxides La_<2-x>Sr_xCuO_4 (x≅0.115) and La_<2-x>Ba_xCuO_4 (x≅0.125)
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概要
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La-based high-T_c oxides La_<2-x>Ba_xCuO_4 (LBCO) and La_<2-x>Sr_xCuO_4 (LSCO) show a local minimum in the curve of T_c versus x around 0.125 for LBCO and around 0.115 for LSCO. In order to investigate the origin of this local minimum, temperature dependence of ^<63/65>Cu/^<139>La-NMR/NQR spectra has been studied on spray-dry-made samples with various Ba/Sr-concentrations. Existence of the antiferromagnetic ordering was confirmed by a significant broadening in the resonance lines at low temperatures below 35 K for LBCO (x≅ 0.125) and 32K for LSCO (x≅ 0.115). By the analysis on the anisotropy in the broadening, the direction of the ordered field was found to be within the CuO plane. The hyperfine field and the Neel temperature showed a maximum at the Ba/Sr-concentration around which T_c is most suppressed, suggesting the crucial interplay between the antiferromagnetic ordering and the suppression in T_c.
- 社団法人日本物理学会の論文
- 1994-09-15
著者
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Fukase Tetsuo
Institute For Materials Research Tohoku University
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Goto Takayuki
Institute For Materials Research Tohoku University
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Fukase Tetsuo
Institute For Material Research Tohoku University
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Fukase Tetsuo
Institute Of Material Research Tohoku University
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Kazama Shinji
Institute of Material Research, Tohoku University
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Miyagawa Kazuya
Institute of Material Research, Tohoku University
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Takayuki Goto
Institute For Material Research Tohoku University
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Miyagawa K
Univ. Tokyo Tokyo
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Kazama S
Institute Of Material Research Tohoku University
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Miyagawa Kazuya
Department Of Applied Physics University Of Tokyo
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Goto Takayuki
Institute for Material Research,Tohoku University
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