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Systematic measurements of the $^{63}$Cu(2) NQR line width were performed inunderdoped YBa$_2$Cu$_3$O$_{7-y}$ samples over the temperature range 4.2 K$<T<300$ K. It was shown that the copper NQR line width monotonically increasesupon lowering temperature in the below-critical region, resembling temperaturebehavior of the superconducting gap. The observed dependence is explained bythe fact that the energy of a condensate of sliding charge-current states ofthe charge-density-wave type depends on the phase of order parameter.Calculations show that this dependence appears only at $T<T_c$. Quantitativeestimates of the line broadening at $T<T_c$ agree with the measurement results.Comment: 4 pages, 2 figure

Temperature dependence of the Cu(2) NQR line width in YBa2Cu3O7−y