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We investigated the thermodynamic property of the heavy fermionsuperconductor UTe$_2$ in pulsed high magnetic fields. The superconductingtransition in zero field was observed at $T_{\rm c}$=1.65 K as a sharp heatcapacity jump. Magnetocaloric effect measurements in pulsed-magnetic fieldsobviously detected a thermodynamic anomaly accompanied by a first-ordermetamagnetic transition at $\mu$$_{0}$$H_{\rm m}$=36.0 T when the fields areapplied nearly along the hard-magnetization $b$-axis. From the results of heatcapacity measurements in magnetic fields, we found a drastic divergingelectronic heat capacity coefficient of the normal state $\gamma$$_{\rm N}$with approaching $H_{\rm m}$. Comparing with the previous works via themagnetic Clausius-Clapeyron relation, we unveil the thermodynamic details ofthe metamagnetic transition. The enhancement of the effective mass observed asthe development of $\gamma_{\rm N}$ indicates that quantum fluctuation stronglyevolves around $H_{\rm m}$; it assists the superconductivity emerging even inextremely high fields.

Thermodynamic Investigation of Metamagnetism in Pulsed High Magnetic Fields on Heavy Fermion Superconductor UTe$_2$