Nanoscale Phase Separation of Incommensurate and Quasi-Commensurate Spin Stripes in Low Temperature Spin Glass of La2−xSrxNiO4

While spin striped phases in La2−xSrxNiO4+y for 0.25 < x 0.33 are the archetypal case of a 1D density wave (SDW) phase doped antiferromagnetic strongly correlated perovskites, few information is available on SDW spatial organization. In this context, we have measured variation vector reflection profile by scanning micro X-ray diffractions with coherent beam. We obtained evidence order–disorder transition lowering high temperature (T > 50 K) to low K). identified quasi-commensurate stripe puddles ordered at T 70 K, while glassy presents nanoscale separation = 30 coexistence and incommensurate assigned interplay quantum frustration strong electronic correlations.