We investigate the effect of easy-axis metamagnetic crossover on superconductivity in ${\mathrm{UTe}}_2$ along the $a$ axis through measurements of ac susceptibility, magnetization, and the magnetocaloric effect. In ultraclean single crystals, we identify a field-induced phase transition within the superconducting state at 5.6 T, driven by metamagnetism. This transition leads to a high-field superconducting state, significantly increasing the upper critical field to 12 T. A sudden increase in entropy at the transition suggests a self-reconstruction of the order parameter, enabling multicomponent superconducting states to adapt to external perturbations.

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• Heavy-fermion systems
• Unconventional superconductors
• Calorimetry
• Specific heat measurements