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We report the results of Phase 1b of The ORGAN Experiment, a microwave cavityhaloscope searching for dark matter axions in the $107.42-111.93~\mu$eV massrange. The search excludes axions with two-photon coupling$g_{a\gamma\gamma}\geq 4\times 10^{-12}\, \textrm{GeV}^{-1}$ with $95\%$confidence interval, setting the best upper bound to date and with the requiredsensitivity to exclude the axion-like particle cogenesis model for dark matterin this range. This result was achieved using a tunable rectangular cavity,which mitigated several practical issues that become apparent when conductinghigh mass axion searches, and was the first such axion search to be conductedwith such a cavity. It also represents the most sensitive axion haloscopeexperiment to date in the $\sim100~\mu$eV mass region.

Exclusion of ALP Cogenesis Dark Matter in a Mass Window Above 100 $\mu$eV