Physics – Condensed Matter – Superconductivity
Scientific paper
2007-03-07
Nucl.Phys.B769:275-286,2007
Physics
Condensed Matter
Superconductivity
To appear in Nuclear Physics B [FS]
Scientific paper
10.1016/j.nuclphysb.2007.01.029
We study the effects of an external magnetic field on the superconducting properties of a quasi-two-dimensional system of Dirac electrons at an arbitrary temperature. An explicit expression for the superconducting gap is obtained as a function of temperature, magnetic field and coupling parameter ($\lambda_{\rm R}$). From this, we extract the $B \times \lambda_{\rm R}$, $T\times \lambda_{\rm R}$ and $B \times T$ phase diagrams. The last one shows a linear decay of the critical field for small values thereof, which is similar to the behavior observed experimentally in the copper doped dichalcogenide $Cu_xTiSe_2$ and also in intercalated graphite. The second one, presents a coupling dependent critical temperature $T_c$ that resembles the one observed in high-$T_c$ cuprates in the underdoped region and also in $Cu_xTiSe_2$. The first one, exhibits a quantum phase transition connecting a normal and a superconducting phase, occurring at a critical line that corresponds to a magnetic field dependent critical coupling parameter. This should be observed in planar materials containing Dirac electrons, such as $Cu_xTiSe_2$.
Marino Eduardo C.
Nunes Lizardo H. C. M.
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