Doping dependence of the upper critical field in La_{2-x}Sr_xCuO_4 from specific heat

Abstract

The low-temperature specific heat of La_{2-x}Sr_xCuO_4 (LSCO) single crystals in magnetic field H up to 12 T has been examined over a wide range of doping (0.063=< p =<0.238). From this we have mapped the upper critical field H_{c2} of LSCO across the entire superconducting diagram. It is found that the H_{c2} shows a doping dependence similar to that of the critical temperature T_c. We have discussed the implications of the result and proposed that there may be an effective superconducting energy scale responsible for the H_{c2} behavior in the underdoped region.

arXiv comment6 pages,3 figures,1 table

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• Anisotropy of the upper critical fields and the paramagnetic Meissner effect in La1.85Sr0.15CuO4 single Crystals
• High magnetic field studies of the Vortex Lattice structure in YBa2Cu3O7
• Doping dependence of thermodynamic properties in cuprate superconductors
• Toward High Temperature Quasi-two-dimensional Superconductivity
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• Transport and spectroscopic properties of superconductor - ferromagnet - superconductor junctions of $L{a}_{1.9}S{r}_{0.1}Cu{O}_4$ - $L{a}_{0.67}C{a}_{0.33}Mn{O}_3$ - $L{a}_{1.9}S{r}_{0.1}Cu{O}_4$
• Condensation mechanism of high-$T_c$ cuprates: the key role of pairon excitations