Pressure induced effects on the Fermi surface of superconducting 2H-NbSe2
Abstract
The pressure dependence of the critical temperature Tc and upper critical field Hc2(T) has been measured up to 19 GPa in the layered superconducting material 2H-NbSe2. Relating the behavior of Hc2(T) to Fermi surface parameters, we find that the electron phonon coupling of the 2D Nb 4d derived bands shows a peak at 5 GPa when the charge density wave (CDW) order is suppressed. On the other hand, Tc(P) shows a bell shaped curve with a maximum at 10.5 GPa, well above the pressure for the suppression of the CDW order. Changes in the band structure produce this shift in the maximum of Tc(P), demonstrating that 2H-NbSe2 shows important differences with respect to other compounds where Tc has a maximum in the temperature-density phase diagram shaped by the suppression of another, non-superconducting, ground state.
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