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The spin-triplet superconductor UTe$_2$ exhibits a myriad of exotic physicalphenomena, including the possession of three distinct superconducting phases atambient pressure for magnetic field $\mu_0 H \leq$ 40~T aligned in certainorientations. However, contradictory reports between studies performed onUTe$_2$ specimens of varying quality have severely impeded theoretical effortsto understand the microscopic properties of this material. Here, we report highmagnetic field measurements on a new generation of ultraclean UTe$_2$ crystalsgrown by a salt flux technique, which possess enhanced superconducting criticaltemperatures and fields compared to previous sample generations. Remarkably,for $H$ applied close to the hard magnetic $b$ direction, we find that theangular extent of magnetic field-reinforced superconductivity is significantlyincreased in these pristine quality crystals. This suggests that in closeproximity to a field-induced metamagnetic transition the enhanced role ofmagnetic fluctuations - that are strongly suppressed by disorder - is likelyresponsible for tuning UTe$_2$ between two distinct spin-tripletsuperconducting phases. Our results reveal a strong sensitivity to crystallinedisorder of the field-reinforced superconducting state of UTe$_2$.

Enhanced triplet superconductivity in next generation ultraclean UTe2