Observation of Nuclear Resonance of Cu in Antiferromagnetic La2CuO4-δ and CuO

Observation of Nuclear Resonance of Cu in Antiferromagnetic La2CuO4-δ and CuO
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反铁磁性La2CuO4-δ和CuO中Cu的核共振观察

DOI:
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发表时间:
1988
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影响因子:
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通讯作者:
K. Kitazawa
K. Kitazawa
中科院分区:
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文献类型:
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作者:
T. Tsuda;T. Shimizu;H. Yasuoka;K. Kishio;K. Kitazawa

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高温 c 相关氧化物 La 2 CuO 4-δ 中 Cu 的零场核磁共振 (NMR) 已在 63 Cu 的 93.85±0.1 MHz 和 65 Cu 的 100.1±0.1 MHz 下观察到,并在 1.3 K 下具有良好的四极分裂。由于四极耦合(耦合常数 ν Q)的综合效应,成功分析了共振模式。 =31.9 MHz(对于 63 Cu)和 29.5 MHz(对于 65 Cu),不对称参数 η=0.03) 和塞曼项,其中内场 ( H N =78.78 kOe) 几乎垂直于最大电场梯度 (EFG) 的方向。在 CuO 中也观察到了四极分裂零场 NMR 信号。观测到的频率参数值为137.1±0.1 MHz、146.9±0.1 MHz、20.07 MHz、18.57 MHz、0.20、121.5 kOe,并且发现H N 的方向几乎平行于最大EFG 的方向。
The zero-field nuclear magnetic resonance (NMR) of Cu in the high- T c related oxide, La 2 CuO 4-δ , has been observed at 93.85±0.1 MHz for 63 Cu and 100.1±0.1 MHz for 65 Cu with well-articulated quadrupole splittings at 1.3 K. The resonance pattern is successfully analyzed as a result of the combined effect of a quadrupole coupling (coupling constant ν Q =31.9 MHz for 63 Cu and 29.5 MHz for 65 Cu with asymmetry parameter η=0.03) and a Zeeman term where the internal field ( H N =78.78 kOe) is nearly perpendicular to the direction of the maximum electric field gradient (EFG). The quadrupole split zero-field NMR signals have also been observed in CuO. The observed frequencies yield parameter values of 137.1±0.1 MHz, 146.9±0.1 MHz, 20.07 MHz, 18.57 MHz, 0.20, 121.5 kOe, and the direction of H N is found to be nearly parallel to the direction of the maximum EFG.