Charge and Spin Dynamics of Cu-O Chains in REBa2Cu3O7 Cuprates (RE=Pr, Y): An NMR/NQR Study

TL;DRAbstract

Spin and charge fluctuations are investigated along the three lattice directions on the Cu(1) site in a nonsuperconducting PrBa2Cu3O7 sample using 63,65Cu NMR/NQR. Our data give evidence for charge instability (CDW) involving charge fluctuations along the O(4)-Cu(l)-O(4) apical axis. In view of these findings, we reanalyzed the situation of chains and planes in YBa2Cu3O7 using Cu(1) and Cu(2) NQR. We confirm the important role of charge/lattice effects in these cuprates and we discuss the consequences of these mechanisms on the interaction between Cu-O chains and CuO2 planes.

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