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We study the evolution of magnetic excitations in the disorderedtwo-dimensional antiferromagnet Sr2Ir1-xRuxO4. A gigantic magnetic gap greaterthan 40 meV opens at x = 0.27 and increases with Ru concentration, renderingthe dispersive magnetic excitations in Sr2IrO4 almost momentum independent. Upto a Ru concentration of x = 0.77, both experiments and first-principlescalculations show the Ir Jeff = 1/2 state remains intact. The magnetic gaparises from the local interaction anisotropy in the proximity of the Rudisorder. Under the coherent potential approximation, we reproduce theexperimental magnetic excitations using the disordered Heisenbergantiferromagnetic model with suppressed next-nearest neighbor ferromagneticcoupling.

Giant Spin Gap and Magnon Localization in the Disordered Heisenberg Antiferromagnet Sr2Ir1-xRuxO4