Abstract
Cu-NQR spectra were measured in La 2− x− y M y Sr x CuO 4, (M=Nd, Gd, Eu, Pr and Y), and La 2− x Ba x CuO 4 with x= 1 8 . The low temperature tetragonal (LTT) structure is stabilized below T d2 in all the samples other than M=Pr. The usual NQR spectra observed in T> T d2 in all the samples change to abnormally broad ones after a complete wipeout of NQR signal below T d2 except for the cases of M=Nd, Gd and Pr. In the cases of M=Nd and Gd, the complete wipeout continues to 1.5 K probably due to the extrinsic nuclear relaxation path through the paramagnetic fluctuation of Nd and Gd moment. In the case of M=Pr with no LTT phase, usual NQR spectrum continues to 1.5 K . These results support a pinning model for the static stripe ordering in the LTT phase.
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