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[文献書誌] I.Watanabe,K.Kumagai: " ^<139>La NQR Study of Magnetic Phase Diagram of La_<2ーx>Sr_xCuO_4" J.Phys.Soc.Jpn.59. 1932-1935 (1990)
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[文献書誌] K.Kumagai et al.: "Transverse Relaxation Rate of CuーNQR in YBa_2Cu_3O_7" J.Phys.Soc.Jpn.59. 2326-2339 (1990)
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[文献書誌] K.Kumagai et al.: "CuーNQR Study of Antiferromagnetism and Superconductivity of Ln_<2ーx>Ce_xCuO_4(Ln=Nd,Sm and Pr)" J.Mag.Mag.Materials. 90 & 91. 675-677 (1990)
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[文献書誌] K.Kumagai et al.: "CuーNQR Study on Electronic State in ElectronーDoped Ln_<2ーx>Ce_xCuO_4(Ln=Nd,Pr,Sm and Eu)" Physica. B165 & 166. 1297-1298 (1990)
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[文献書誌] K.Kumagai et al.: "CuーNQR Study of Successive Magnetic Phase Transition in Antiferroーmagnetic YBa_2(Cu_<1ーx>T_x)_3O_6" J.Phys.Soc.Jpn.59. 3471-3474 (1990)
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[文献書誌] K.Kumagai et al.: "Some Anomalies due to LowーTemperature Strucutral Transition around x=0.12 in La_<2ーx>Ba_xCuO_4" J.Phys.Soc.Jpn.60. (1991)