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Phys Rev Lett. 2000 Aug 7;85(6):1310-3.

In-plane charge modulation below T(c) and charge-density-wave correlations in the chain layer in YBa2Cu3O7

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1
Laboratoire de Spectrometrie Physique, Universite J. Fourier, BP 87, 38402 Saint Martin d'Heres, France.

Abstract

Nuclear quadrupole resonance (NQR) measurements have been performed on Cu(2) plane sites and Cu(1) chain sites in fully doped YBa2Cu3O7 between 300 and 4.2 K. The sharp increase of the Cu(1) NQR linewidth across the superconducting transition and the T dependence of the Cu(1) spin lattice relaxation rate confirm the existence of a charge-density-wave state (CDW) in the chains. The simultaneous broadening of the Cu(2) linewidth below T(c) and the anomalous T dependence of Cu(1) and Cu(2) NQR parameters indicate that these in-chain CDW correlations are strongly involved in the appearance of an in-plane charge modulated structure below T(c).

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