Neutron-Scattering Study of Impurity Effect on Stripe Correlations in La-Based 214 High-Tc Cuprate

Abstract

We present results of neutron-scattering study of impurity effects on the static stripe correlations in La-based 214 high-Tc cuprate. We found that the superlattice peaks from the charge-density-wave (CDW) order was induced by doping magnetic Fe ions in the low-temperature-orthorhombic (LTO) phase of La2−xSrxCuO4 (LSCO). The spin-density-wave (SDW) order is also stabilized by Fe-doping, suggesting the appearance of stripe ordered state in the LTO phase, as is seen it the low-temperature-tetragonal (LTT) phase of La1.875Ba0.125Cu4 (LBCO). Therefore, the stripe order can be potentially realized in the La-214 system irrespective of crystal structure. On the other hand, the onset temperature for the appearance of SDW and CDW orders is lowered by Zn-doping in La1.875Ba0.125CuO4 system. This result suggests that the existing well-stabilized stripe order is degraded by substituting non-magnetic Zn ions.