Magnetic-field induced Charge Order Quantum Criticality in La2-xSrxCuO4

The nature and origin of charge order in high-temperature superconducting cuprates are still open questions. Recent measurements suggest that the long-range charge ordered phase emerges out of a broader regime characterized by short-range, and possibly dynamical, correlations. However, it remains unresolved whether the emergence develops through a quantum critical point or through a smooth crossover. As resonant soft x-ray scattering techniques have proved to be one of the most sensitive techniques to probe charge correlations in cuprates, here we propose to study charge order around optimal doping with the resonant inelastic x-ray scattering (RIXS) technique. We plan to add another dimension to the cuprate phase diagram by combining RIXS with application of magnetic field. It enables us to clarify whether the long-range charge order can be field induced, which would support or stay in opposition to the quantum critical point scenario.