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Pressure induced effects on the Fermi surface of superconducting 2H-NbSe$_2$ | | H. Suderow
; V.G. Tissen
; J.P. Brison
; J.L. Martinez
; S. Vieira
; | | Date: |
25 Apr 2005 | | Journal: | Phys. Rev. Lett., Vol.95, Issue 11, 117006 (2005) | | Subject: | Superconductivity | cond-mat.supr-con | | Abstract: | The pressure dependence of the critical temperature $T_c$ and upper critical field $H_{c2}(T)$ has been measured up to 19 GPa in the layered superconducting material 2H-NbSe$_2$. Relating the behavior of $H_{c2}(T)$ 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, $T_c(P)$ 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 $T_c(P)$, demonstrating that 2H-NbSe$_2$ shows important differences with respect to other compounds where $T_c$ has a maximum in the temperature-density phase diagram shaped by the suppression of another, non-superconducting, ground state. | | Source: | arXiv, cond-mat/0504639 | | Services: | Forum | Review | PDF | Favorites | |
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