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We performed a neutron-scattering experiment to investigate the effect ofdistortion of CuO2 planes on the low-energy spin correlation ofLa1.94-xSrxCe0.06CuO4 (LSCCO). Due to the carrier-compensation effect byco-doping of Sr and Ce, LSCCO has a smaller orthorhombic lattice distortioncompared to La2-xSrxCuO4 (LSCO) with comparable hole concentration p. A cleargap with the edge-energy of 6~7 meV was observed in the energy spectrum oflocal dynamical susceptibility c"(w) for both x=0.18 (p~0.14) and x=0.24(p~0.20) samples as observed for optimally-doped LSCO (x=0.15~0.18). For thex=0.14 (p~0.10) sample, in addition to the gap-like structure in c"(w) weobserved a low-energy component within the gap which develops below 2~3meV withdecreasing the energy. The low-energy component possibly coincides with thestatic magnetic correlation observed in this sample. These results arediscussed from a view point of relationship between the stability of low-energyspin fluctuations and the distortion of CuO2 planes.

Neutron-scattering study of spin correlations in La1.94-xSrxCe0.06CuO4