NQR and NMR of 139La in Antiferromagnetic La2CuO4-δ
NQR and NMR of 139La in Antiferromagnetic La2CuO4-δ
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反铁磁性 La2CuO4-δ 中 139La 的 NQR 和 NMR
DOI：
10.1143/jpsj.56.4559
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发表时间：
1987
影响因子：
1.7
通讯作者：
K. Fueki
中科院分区：
文献类型：
--
作者：
H. Nishihara;H. Yasuoka;T. Shimizu;T. Tsuda;T. Imai;S. Sasaki;S. Kanbe;K. Kishio;K. Kitazawa;K. Fueki
在低温下观测到的La2CuO4-δ中139La的核四极共振谱相当复杂，成功地解释为一个受四极耦合(耦合常数νq=6.38±0.0 2 MHz，非对称参数η=0.0 1±0.0 1)和小塞曼项共同作用的信号，其中内场(HN=0.997±0.010 kOe)几乎垂直于最大场梯度的方向。铜的低温自旋结构被认为是一个简单的反铁磁体，具有平行于a轴的亚格子磁矩。详细测量了νQ和H N随温度的变化关系。结果表明，H_N的分数减少与铜亚晶格矩成正比，与弱巡游反铁磁体的自旋涨落理论的预言基本一致。
Rather complex Nuclear Quadrupole Resonance (NQR) spectrum of 139 La in La 2 CuO 4-δ , observed at low temperatures is successfully interpreted as a signal from a single La site which suffers a combined effect of a quadrupole coupling (coupling constant ν Q =6.38±0.02 MHz with asymmetry parameter η=0.01±0.01) and a small Zeeman term where the internal field ( H N =0.997±0.010 kOe) is nearly perpendicular to the direction of the maximum field gradient. The spin structure of Cu at low temperatures is suggested to be a simple antiferromagnet with sublattice moments parallel to the a -axis. The temperature dependences of ν Q and H N have been measured in detail. The fractional decrease of H N which is proportional to the Cu sublattice moments is found to be in general accord with the prediction of spin fluctuations theory for weak itinerant antiferromagnets.
DOI：
10.1007/bf01303701
发表时间：
1986-01-01
期刊：
ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER
影响因子：
--
作者：
BEDNORZ, JG;MULLER, KA
通讯作者：
MULLER, KA