Frustration driven hidden electronic orders in Sr2VO3FeAs

A promising route to realizing such unconventional electronic states is to combine mutually distinct order parameters in heterostructures. Sr2VO3FeAs is a superlattice of superconducting [SrFeAs]+1 and Mott-insulating [SrVO3]-1 layers, which favors a Q = (pi,0) stripe order and Q = (pi,pi) Néel order, respectively. A nuclear magnetic resonance study discovered a hidden order below TO ~ 155K without any evidence of apparent symmetry breaking. Furthermore, our preliminary resonant inelastic x-ray scattering (RIXS) results revealed an incommensurate magnetic instability well correlated with the ordering temperature from magneto-transport, TN ~ 55K and coexisting with the superconductivity. We conjecture the stripe order gives a way to the formation of incommensurate order and ultimately the hidden order by frustration between V and Fe. We propose to use ultra-high-resolution RIXS at the Fe L3 edge to measure the magnetic excitation spectra that encode dynamic spin-spin correlations.