In this study, we have performed the magnetocaloric effect and the specific heat measurements of chromium spinel oxide $\mathrm{Hg}{\mathrm{Cr}}_2{\mathrm{O}}_4$, wherein the magnetic ${\mathrm{Cr}}^{3+}$ ions form a highly frustrated pyrochlore lattice with significant spin-lattice coupling. In addition to the known magnetic-field-induced phases, our thermodynamic measurements detect a quantum phase just before the saturation of the magnetization, which has not been expected from the classical theories of the pyrochlore lattice antiferromagnet with spin-lattice coupling. Based on recent theoretical model calculation, we discuss the possibility of a spin nematic state appearing for this quantum phase.

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• Antiferromagnetism
• Frustrated magnetism
• Magnetocaloric effect
• Nematic order
• Specific heat
• Oxides
• Pyrochlores
• Spinels
• Specific heat measurements