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When a superconductor is heated above its critical temperature $T_c$,macroscopic coherence vanishes, leaving behind droplets of thermallyfluctuating Cooper pair. This superconducting fluctuation effect above $T_c$has been investigated for many decades and its influence on the transport,thermoelectric and thermodynamic quantities in most superconductors is wellunderstood by the standard Gaussian fluctuation theories. The transversethermoelectric (Nernst) effect is particularly sensitive to the fluctuations,and the large Nernst signal found in the pseudogap regime of the underdopedhigh-$T_c$ cuprates has raised much debate on its connection to the origin ofsuperconductivity. Here we report on the observation of a colossal Nernstsignal due to the superconducting fluctuations in the heavy-fermionsuperconductor URu$_2$Si$_2$. The Nernst coefficient is enhanced by as large asone million times over the theoretically expected value within the standardframework of superconducting fluctuations. This, for the first time in anyknown material, results in a sizeable thermomagnetic figure of meritapproaching unity. Moreover, contrary to the conventional wisdom, theenhancement in the Nernst signal is more significant with the reduction of theimpurity scattering rate. This anomalous Nernst effect intimately reflects thehighly unusual superconducting state embedded in the so-called hidden-orderphase of URu$_2$Si$_2$. The results invoke possible chiral or Berry-phasefluctuations originated from the topological aspect of this superconductor,which are associated with the effective magnetic field intrinsically induced bybroken time-reversal symmetry of the superconducting order parameter.

Colossal thermomagnetic response in the exotic superconductor URu2Si2