Abstract
While spin striped phases in La2−xSrxNiO4+y for 0.25 < x < 0.33 are the archetypal case of a 1D spin density wave (SDW) phase in doped antiferromagnetic strongly correlated perovskites, few information is available on the SDW spatial organization. In this context, we have measured the spatial variation of the wave vector of the SDW reflection profile by scanning micro X-ray diffractions with a coherent beam. We obtained evidence of a SDW order–disorder transition by lowering a high temperature phase (T > 50 K) to a low temperature phase (T < 50 K). We have identified quasi-commensurate spin stripe puddles in the ordered phase at 50 < T < 70 K, while the low temperature spin glassy phase presents a nanoscale phase separation of T = 30 K, with the coexistence of quasi-commensurate and incommensurate spin stripe puddles assigned to the interplay of quantum frustration and strong electronic correlations.
Highlights
Commensurate–incommensurate (C–IC) transitions [1] and the related complex multiscale distribution of dislocations with the formation of striped phases are of high interest in the quantum complex matter research field
We report the study of the spin density wave (SDW) order–disorder transition in La1−x Srx NiO4, which was observed as transitioning from the spin ordered phase at 50 < T < 70 K to the low temperature disordered phase at T = 30 K [62]
In order to shed light on the counterintuitive behavior of SDW disordering at low temperatures, we have investigated the spatial evolution of the SDW in real space
Summary
Commensurate–incommensurate (C–IC) transitions [1] and the related complex multiscale distribution of dislocations with the formation of striped phases are of high interest in the quantum complex matter research field. This phenomenon has been observed in two-dimensional atomic layers with strongly correlated electronic matter forming stacks held together by a week Van der Waals force. In the C phase, the wave modulation is locked or pinned to the periodicity of the crystal while, in the incommensurate state, the wave is unlocked with the crystal periodicity In this case the wave can be unpinned by a weak perturbation and dislocations, as bosonic strings can wander and sweep an increasingly greater volume at low temperatures driven by quantum fluctuations. A crystalline phase with real space ordering in a single state in the k-space can become disordered at lower temperatures
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