NMR STUDIES OF 17O IN THE NORMAL STATE OF YBA2CU3O6+X
NMR STUDIES OF 17O IN THE NORMAL STATE OF YBA2CU3O6+X
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YBA2CU3O6 X 正常状态下 17O 的 NMR 研究
DOI：
10.1143/jpsj.59.3698
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发表时间：
1990
影响因子：
1.7
通讯作者：
K. Kosuge
中科院分区：
文献类型：
--
作者：
Y. Yoshinari;H. Yasuoka;Y. Ueda;K. Koga;K. Kosuge
利用YBa 2Cu 3 O 6+ x（x =0.96，0.8，0.6）磁取向粉末样品，研究了正常态下Knight位移（K）张量和核自旋-晶格弛豫速率（1/T1）的温度依赖性.由平面氧位（O（2，3））的K -χ图，我们确定了超精细场张量的主值，发现它们几乎不依赖于空穴浓度。显着的功能已经出现了从T -依赖的1/（T1 T）在O（2，3）的网站，即它揭示了几乎相同的T -依赖的自旋部分的奈特位移。这一观察结果表明，自旋激发的能量宽度在q = 0附近是T -无关的正常状态。奈特位移张量在顶端的氧网站也被测量和讨论。
The temperature dependence of both the Knight shift ( K ) tensor and the nuclear spin-lattice relaxation rate (1/ T 1 ) in the normal state have been studied, by using the magnetically oriented powered samples of YBa 2 Cu 3 O 6+ x with x =0.96, 0.8 and 0.6. From the K -χ plot for the planer oxygen sites (O(2, 3)), we have determined the principal values of the hyperfine field tensor and found that those hardly depend on the hole concentration. The remarkable feature has emerged from the T -dependence of the 1/( T 1 T ) at the O(2, 3) sites; i.e. it reveals almost the same T -dependence of the spin parts of the Knight shift. This observation suggests that the energy width of the spin excitations around q ∼0 is T -independent in the normal state. The Knight shift tensor at the apical oxygen sites has also been measured and is discussed.