Giant impact of magnetic impurity on stability of stripe order in high-Tc cuprate

To study the stability of stripe orders in cuprate oxides thought impurity-effect, we performed neutron-scattering experiments on La$_{1.88-y}$Sr$_{0.12+y}$Cu$_{1- y}$M$_{y}$O$_4$ ($y$=0 for M=Cu, Zn and $y$=0.01 for M=Ga, Fe). Well-defined incommensurate peaks from charge-density-wave order was induced in the low- temperature-orthorhombic phase (LTO) by impurity substitution, and the scattering intensity is much stronger in the Fe-doped system than in the Zn-doped one. Integrated intensity of magnetic peak from spin-density-wave order was also enhanced by Fe-doping, while it does not change so much by Zn -and Ga- substitutions. These results indicate that the static spin and charge stripe orders can be realized in the LTO phase, and the stability is effectively induced by doping the magnetic impurity.