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首页> 外文期刊>Physical Review, B. Condensed Matter >CU-63,CU-65 NMR AND NQR STUDY OF THE CU2+ ELECTRONIC STATE AND THE SPIN DYNAMICS IN THE SPIN-PEIERLS COMPOUND CUGEO3
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CU-63,CU-65 NMR AND NQR STUDY OF THE CU2+ ELECTRONIC STATE AND THE SPIN DYNAMICS IN THE SPIN-PEIERLS COMPOUND CUGEO3

机译：纺丝-Peierls复合材料CUGEO3中CU2 +电子态和自旋动力学的CU-63，CU-65 NMR和NQR研究

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Cu-63,Cu-65 NMR and NQR measurements have been performed to study the Cu2+ electronic state and the spin dynamics in CuGeO3, which is an inorganic compound that undergoes the spin-Peierls transition at T-sp similar to 14 K. The NQR frequency is discussed in connection with the lattice dimerization accompanied by the spin-Peierls transition. The Knight shift with an axial symmetry showed the temperature dependence corresponding to the reduction of the spin susceptibility. From the analysis of the Knight shift and the magnetic susceptibility, orbital and spin susceptibilities are evaluated. The analysis of the hyperfine structure leads to a conclusion that the electronic state of the Cu2+ ion above T-sp is described by a single-ion model in a crystal field with a tetragonal symmetry. The supertransferred hyperfine interaction, which is one of the characteristic features of Cu2+ ions in the CuO2 plane in the high-T-c superconducting copper oxides, is found not to play an important role in CuGeO3. The temperature dependence of the nuclear spin-lattice relaxation rate 1/T-1 clearly shows presence of a gap in the magnetic excitation spectrum below T-sp. The relaxation mechanism is discussed based on the spinless fermion treatment for an S = 1/2 one-dimensional Heisenberg antiferromagnet (1DHAF) above T-sp and for a nonuniform S = 1/2 1DHAF with two unequal and alternating exchange interactions below T-sp. Above T-sp, it is also discussed in terms of the dynamical susceptibility of the 1DHAF. [References: 42]
机译：已经进行了Cu-63，Cu-65 NMR和NQR测量，以研究CuGeO3中的Cu2 +电子态和自旋动力学，CuGeO3是一种无机化合物，在T-sp处发生自旋Peierls转变，类似于14K。结合伴随自旋-Peierls跃迁的晶格二聚化来讨论频率。具有轴向对称性的奈特位移显示出温度依赖性，这与自旋磁化率的降低相对应。通过对奈特位移和磁化率的分析，评估了轨道和自旋磁化率。对超细结构的分析得出一个结论，即在T-sp上方的Cu2 +离子的电子态由具有四方对称性的晶体场中的单离子模型描述。发现超转移超精细相互作用是高T-c超导铜氧化物中CuO2平面中Cu2 +离子的特征之一，但在CuGeO3中没有重要作用。核自旋晶格弛豫速率1 / T-1的温度依赖性清楚地表明，磁激发光谱中存在低于T-sp的缺口。基于无旋费米子处理，讨论了在T-sp之上的S = 1/2一维海森堡反铁磁体（1DHAF）和在T-sp之下具有两个不相等且交替的交换相互作用的非均匀S = 1/2 1DHAF的弛豫机理。 sp。在T-sp之上，还根据1DHAF的动力学敏感性进行了讨论。 [参考：42]

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