Glassy slowing of stripe modulation in (La,Eu,Nd)2-x(Sr,Ba)xCuO4: A 63Cu and 139La NQR study down to 350 mK

63Cu and 139La nuclear quadrupole resonance and Zeeman perturbed nuclear magnetic resonance experiments are performed on the striped phase of the high-temperature superconductors La2-xBaxCuO4 and La2-x-y(Nd,Eu)ySrxCuO4. The first goal of the present study is to utilize the fact that ordered Cu magnetic moments exert a static hyperfine field on the 63Cu and 139La nuclei to deduce the charge density and ordered moment within the CuO2 planes. A …