Evidence of Fermi surface reconstruction at the metamagnetic transition of the strongly correlated superconductor UTe 2
Résumé
Thermoelectric power (S) and Hall effect (R H) measurements on the paramagnetic superconductor UTe 2 with the magnetic field applied along the hard magnetization b axis are reported. The first-order nature of the metamagnetic transition at H m = H b c2 = 35 T leads to drastic consequences on S and R H. In contrast to the field dependence of the specific heat in the normal state through H m , S(H) is not symmetric with respect to H m. This implies a strong interplay between ferromagnetic fluctuations and a Fermi-surface reconstruction at H m. R H is very well described by incoherent skew scattering above the coherence temperature T m corresponding roughly to the temperature of the maximum in the susceptibility T χmax and coherent skew scattering at lower temperatures. The discontinuous field dependence of both S(H) and the ordinary Hall coefficient R 0 , at H m and at low temperature, provides evidence of a change in the band structure at the Fermi level.
Domaines
Matière Condensée [cond-mat]Origine | Fichiers produits par l'(les) auteur(s) |
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