Altermagnetism is an emerging magnetic order unifying essential characteristics of ferromagnetic and antiferromagnetic states. The CrSb has attracted significant interest owing to its large altermagnetic spin-splitting energy. In this paper, we present the growth details of high-quality single crystals of CrSb using the self-flux method and investigate their physical properties. We obtained large (001) oriented hexagonal crystals, up to $2\times 2.5\times 1{\mathrm{mm}}^3$ in size with residual resistivity ratio $\sim 11$. A pronounced positive magnetoresistance of up to $80\%$ is observed at 3.5 K. Most strikingly, the room temperature specific heat value exceeds the Dulong-Petit limit, being attributed to a broad magnon contribution from the altermagnetic order of CrSb. The specific heat fit reveals a magnon energy gap $\sim 16\pm 1\mathrm{meV}$. Further, ac susceptibility measurements demonstrate the absence of superconductivity down to 0.1 K. These findings underscore CrSb as a viable altermagnet for room temperature magnonic and spintronic applications.

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• Altermagnetism
• Crystal symmetry
• Magnetism
• Magnetotransport
• Specific heat
• Crystal growth
• Magnetization measurements
• Resistivity measurements
• Specific heat measurements
• X-ray diffraction