Temperature Dependence of the Cu(2) NQR Line Width in YBa$_2$Cu$_3$O$_{7-y}$

A. V. Dooglav; M. V. Eremin; Yu. A. Sakhratov; A. V. Savinkov

doi:10.1134/1.1405895

paper

Temperature Dependence of the Cu(2) NQR Line Width in YBa $_{2}$ Cu $_{3}$ O $_{7 - y}$

arXiv:cond-mat/0108230 · doi:10.1134/1.1405895

Abstract

Systematic measurements of the $^{63}$ Cu(2) NQR line width were performed in underdoped 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 increases upon lowering temperature in the below-critical region, resembling temperature behavior of the superconducting gap. The observed dependence is explained by the fact that the energy of a condensate of sliding charge-current states of the charge-density-wave type depends on the phase of order parameter. Calculations show that this dependence appears only at $T < T_{c}$ . Quantitative estimates of the line broadening at $T < T_{c}$ agree with the measurement results.

4 pages, 2 figures

References in corpus (1)

Charged Vortices in High Temperature Superconductors Probed by NMR

Temperature Dependence of the Cu(2) NQR Line Width in YBa2​Cu3​O7−y​

Abstract

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Temperature Dependence of the Cu(2) NQR Line Width in YBa $_{2}$ Cu $_{3}$ O $_{7 - y}$