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Metamagnetic transitions in the novel spin-triplet superconductor UTe$_2$were investigated through the newly developed simultaneous measurements ofmagnetization and sample temperature for the field along the orthorhombic$b$-axis and close to the [011] direction, where reentrant superconductivity(RSC) is detected below and above the first-order metamagnetic transition field$H_{\rm m}$. Combining the Maxwell's relation and the Clausius-Clapeyronequation, we obtained the field dependence of Sommerfeld coefficient $\gamma$through the first-order metamagnetic transition. A significant enhancement ofthe effective mass toward $H_{\rm m}$ were detected for both field directions.On the other hand, above $H_{\rm m}$, the effective mass discontinuouslydecreases for $H~||~b$, while it discontinuously increases for $H~||~\sim[011]$, which seems to make a crucial role for the RSC.

Enhancement and Discontinuity of Effective Mass through the First-Order Metamagnetic Transition in UTe$_2$