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We have used rotational anisotropic polarized Raman spectroscopy to study thesymmetries, the temperature and the doping dependence of the charge orderedstate in metallic $(Sr_{1-x}La_{x})_{3}Ir_{2}O_{7}$. Although the Raman probesize is greater than the charge ordering length, we establish that the chargeordering breaks the fourfold rotational symmetry of the underlying tetragonalcrystal lattice into twofold, as well as the translational symmetry, and formsshort-range domains with $90^{\circ}$ rotated charge order wave vectors, assoon as the charge order sets in below $T_{CO} = \sim$ 200K and across thedoping-induced insulator metal transition. We observe that this charge ordermode frequency remains nearly constant over a wide temperature range and up tothe highest doping level. These above features are highly reminiscent of theubiquitous unidirectional charge order in underdoped high-$T_C$copper-oxide-based superconductors (cuprates). We further resolve that thecharge order damping rate diverges when approaching $T_{CO}$ from below andincreases significantly as increasing the La doping level, which resembles thebehaviors for a disorder-interrupted ordered phase and has not been observedfor the charge order in cuprates.

physical review. b./physical review. b

Polarized Raman spectroscopy study of metallic  $(Sr_{1-x}La_{x})_{3}Ir_{2}O_{7}$: a consistent picture of  disorder-interrupted unidirectional charge order