Abstract
Single crystals of two-dimensional2H-NbSe2, which undergoes a superconducting transition atTc = 7.2 K and a charge-density wave (CDW) transition atTCDW = 30 K, were synthesized. Measurements of the resistivity, Hall coefficientand magnetoresistance (MR) versus temperature were performed onNbSe2 crystals with different resistance residual ratios(RRR = R(300 K)/R(8 K)), chosen from different batches. The superconducting transition temperature hardlychanges with the RRR, while the MR and Hall coefficient are strongly dependent on theRRR values of the samples. Moreover, the temperature and field dependenceof the MR violate Kohler’s rule, indicating that the scattering times of thecharge carriers are no longer isotropic. A steep decrease of the Hall coefficientRH below 50 K is only observed for the high quality sample; this can be interpreted in terms ofa drastic increase of the mean free path for the electron-type charge carriers. Theeffect of the CDW transition on the Hall coefficient is discussed using a two-bandmodel and a sharp change in the scattering rate on an electron-like orbit belowTCDW is suggested.
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