NQR study of copper in Lu0.9Pr0.1Ba2Cu3O7

Markandeyulu, G. ; Gopalakrishnan, K. V. ; Rajarajan, A. K. ; Gupta, L. C. ; Vijayaraghavan, R. ; Tamhane, A. S. ; Gnanasekar, K. I. ; Pinto, R. (1993) NQR study of copper in Lu0.9Pr0.1Ba2Cu3O7 Physical Review B: Condensed Matter and Materials Physics, 47 (2). pp. 1123-1125. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v47/i2/p1123_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.47.1123


Nuclear quadrupole resonance (NQR) of copper in Lu0.9Pr0.1Ba2Cu3O7 at 4.2 K has been observed. The resonances of 63Cu(II) and 65Cu(II) have been observed at 31.50 and 29.15 MHz, respectively. These frequencies are the same as those in YBa2Cu3O7 but not in accordance with the expectations from the decrease of resonance frequency in RBa2Cu3O7 compounds. VQ63Q65 is 1.08 which is the ratio of the eQ(63Cu)/eQ(65Cu), implying that there is no static magnetic field at the Cu(II) site. The relaxation times T1 and T2 at 31.50 MHz have been determined and are found to be 42 ms and 140 μs, respectively. T1 is much less than that (~1 s) in YBa2Cu3O7 and EuBa2Cu3O7, indicating that fluctuating moments are present in the material. These could be either on Cu ions that are close to Pr ions or on Pr ions themselves. The contrasting behavior of resonance frequency and T1 in Lu0.9Pr0.1Ba2Cu3O7 with respect to other 1:2:3 compounds is commented upon.

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