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.

6 pages,3 figures,1 table

References in corpus (3)

• Visualizing pair formation on the atomic scale in the high-Tc superconductor Bi2Sr2CaCu2O8+d
• Reversible magnetization and critical fluctuations in systematically doped YBa${}_2$Cu${}_3$O${}_{7-\delta }$ single crystals
• Two energy scales and close relationship between the pseudogap and superconductivity in underdoped cuprate superconductors

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• Kinetic-energy driven superconductivity in cuprate superconductors
• Spin density wave induced disordering of the vortex lattice in superconducting La${}_{2-x}$Sr${}_x$CuO${}_4$
• Doping dependence of Meissner effect in cuprate superconductors
• High magnetic field studies of the Vortex Lattice structure in YBa2Cu3O7