Mott transition and superconductivity in the strongly correlated organic superconductor $κ$-(BEDT-TTF)$_{2}$Cu[N(CN)$_{2}]$Br

Details Mott transition and superconductivity in the strongly correlated organic superconductor $κ$-(BEDT-TTF)$_{2}$Cu[N(CN)$_{2}]$Br Mott transition and superconductivity in the strongly correlated organic superconductor $κ$-(BEDT-TTF)$_{2}$Cu[N(CN)$_{2}]$Br

2008-01-22

arxiv.org/abs/0801.3483v1

Phys. Rev. B 77, 054505 (2008)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.77.054505

The magnetic field effect on the phase diagram of the organic Mott system $\kappa$-(BEDT-TTF)$_{2}$Cu[N(CN)$_{2}$]Br in which the bandwidth was tuned by the substitution of deuterated molecules was studied by means of the resistivity measurements performed in magnetic fields. The lower critical point of the first-order Mott transition, which ended on the upper critical field $H_{\rm c2}$-temperature plane of the superconductivity, was determined experimentally in addition to the previously observed upper critical end point. The lower critical end point moved to a lower temperature with the suppression of $T_{\rm c}$ in magnetic fields and the Mott transition recognized so far as the $S$-shaped curve reached $T =$ 0 when $H > H_{\rm c2}$ in the end.

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