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Cu(1) NQR in Y_(1-x)Pr_xBa_2Cu_3O_7

机译:Y_(1-x)Pr_xBa_2Cu_3O_7中的Cu(1)NQR

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摘要

Cu(1) NQR spectra of the CuO chain site in Y_(1-x)Pr_xBa_2Cu_3O_7 (x = 0.1 and 0.2), and the ~(63)Cu(1) NQR spin-lattice relaxation rates l/T_1 in Y_(0.9)Pr_(0.1)Ba_2Cu_3O_7 have been measured. The half widths are about three times wider than those of the pure YBa_2Cu_3O_7. The peak frequencies are lowered by the Pr doping. This seems to indicate a decrease of on-site holes at the Cu(1) site. The relaxation rate 1/T_1 is found to obey the same temperature dependence, 1/T_1 = aT + bT~3 as reported for pure YBa_2Cu_3O_7.
机译:Y_(1-x)Pr_xBa_2Cu_3O_7(x = 0.1和0.2)中CuO链位点的Cu(1)NQR谱图,Y_(0.9)中的〜(63)Cu(1)NQR自旋晶格弛豫率l / T_1已测量)Pr_(0.1)Ba_2Cu_3O_7。半宽度大约是纯YBa_2Cu_3O_7的三倍。 Pr掺杂降低了峰值频率。这似乎表明在Cu(1)位置上的现场空穴减少了。发现弛豫率1 / T_1遵循与纯YBa_2Cu_3O_7相同的温度依赖性,即1 / T_1 = aT + bT〜3。

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