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UCoGe exhibits superconductivity in the presence of ferromagnetism. When afield is applied along the b axis (perpendicular to the easy axis),ferromagnetism is weakened and superconductivity is enhanced. This enhancementhas been attributed to an increase in coupling as observed in the enhancedeffective mass produced by the critical fluctuations as the ferromagnetictransition is strongly suppressed. However it is also important to know if andhow the Fermi surface changes near the critical point. Here we reportmeasurements of the thermoelectricity of UCoGe which reveal a low carrierdensity metal. Under magnetic field applied along the b axis, a sharp peak isobserved in the thermopower of UCoGe at H*=11.1T and low temperature whichbecomes broader at higher temperatures. At higher field, the thermopowerchanges sign which suggests a modification of the Fermi Surface. We analyzethese results using a topological change in Fermi surface and show that thiscan explain both the thermopower and the enhanced superconductivity.

Thermoelectricity of the Ferromagnetic Superconductor UCoGe