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We report an extended search for the axion dark matter using the CAPP18Thaloscope. The CAPP18T experiment adopts innovative technologies of ahigh-temperature superconducting magnet and a Josephson parametric converter.The CAPP18T detector was reconstructed after an unexpected incident of thehigh-temperature superconducting magnet quenching. The system reconstructionincludes rebuilding the magnet, improving the impedance matching in themicrowave chain, and mechanically readjusting the tuning rod to the cavity forimproved thermal contact. The total system noise temperature is $\sim$0.6\,K.The coupling between the cavity and the strong antenna is maintained at $\beta\simeq 2$ to enhance the axion search scanning speed. The scan frequency rangeis from 4.8077 to 4.8181 GHz. No significant indication of the axion darkmatter signature is observed. The results set the best upper bound of theaxion-photon-photon coupling ($g_{a\gamma\gamma}$) in the mass ranges of 19.883to 19.926\,$\mu$eV at $\sim$0.7$\times|g_{a\gamma\gamma}^{\text{KSVZ}}|$ or$\sim$1.9$\times|g_{a\gamma\gamma}^{\text{DFSZ}}|$ with 90\,\% confidencelevel. The results demonstrate that a reliable search of the high-mass darkmatter axions can be achieved beyond the benchmark models using the technologyadopted in CAPP18T.

Extended Axion Dark Matter Search Using the CAPP18T Haloscope