Electronic Raman scattering through a stripe ordering transition in La2-xSrxNiO4

Магнетизм

Анотація

We describe the results of electronic Raman scattering experiments in two differently doped single crystals of La_2-xSr_x NiO₄ (x = 0.225 and 1/3). In B_1g symmetry a crossover from weakly interacting to pseudogap-like behavior is observed at a charge-ordering temperature T_co. In B_2g symmetry a redistribution of electronic continua with decreasing temperature is accompanied by a loss of spectral weight below T_co in the low-frequency region due to opening of a pseudogap. The slope of the Raman response at vanishing frequencies is investigated, too. Its temperature behavior in B_2g symmetry, which predominantly selects charge carriers with momenta along the diagonals of the NiO₂ bonds, provides clear evidence for one-dimensional charge transport in the charge-ordered phase.