YBa_（2－x）Pr_xCu_3O_（7－8）的磁取向粉末样品的^（63）Cu

Variable Temperature ￣(63)Cu-NMR Study on Magnetic Oriented Samples of YBa_(2-x)Pr_xCu_3O_7

本文报道了ＹＢａ２－ｘＰｒｘＣｕ３Ｏ７－８（ｘ＝０．０２５－０．１）磁取向粉末样品的变温ＮＭＲ研究。作者详细测量了６３Ｃｕ的Ｋｎｉｇｈｔ位移Ｋ和自旋－晶格驰豫率１／Ｔ２的变温规律。随着Ｐｒ的掺进，Ｃｕ（１）Ｃｕ（２）位的Ｋｎｉｇｈｔ位移开始依赖于温度，Ｋｎｉｇｈｔ位移的轨道贡献和各向异性超精细作用基本保持不变。在我们测量温区内（７７－３００Ｋ），１／Ｔ１随掺杂浓度增加而有所增强，这与反铁磁相关自旋涨落图象一致。我们用ＭＭＰ理论进行了详细分析。

The 63Cu Knight shift K and spin-lattice relaxation rate 1 / T2 have been measured in superconducting cuprate YBa2-xPrxCu3O7, (0.025≤x≤0.10). With Pr doping, K decreases and develops a temperature dependence at both plane and chain sites. The orbital contribution to k and the anisotropy of the Cu hyperfine coupling remain essentially unchanged over the entire Pr concentration range. With Pr doping, spin-lattice relaxation rate 1 / T1 increases slightly almost at all temperture. This is consistent with the picture of antiferromagnetic fluctuations.An anslysis of the data in the phenomenological framework of Millis, Monien, and Pines is given.