Physics – Condensed Matter – Superconductivity
Scientific paper
2007-04-11
Phys. Rev. B76, 134509 (2007)
Physics
Condensed Matter
Superconductivity
Published version
Scientific paper
10.1103/PhysRevB.76.134509
The upper critical field $H_{c2}$ is one of the many non conventional properties of high-$T_c$ cuprates. It is possible that the $H_{c2}(T)$ anomalies are due to the presence of inhomogeneities in the local charge carrier density $\rho$ of the $CuO_2$ planes. In order to study this point, we have prepared good quality samples of polycrystalline $La_{2-x}Sr_xCuO_{4}$ using the wet-chemical method, which has demonstrated to produce samples with a better cation distribution. In particular, we have studied the temperature dependence of the second critical field, $H_{c2}(T)$, through the magnetization measurements on two samples with opposite average carrier concentration ($\rho_m=x$) and nearly the same critical temperature, namely $\rho_m = 0.08$ (underdoped) and $\rho_m = 0.25$ (overdoped). The results close to $T_c$ do not follow the usual Ginzburg-Landau theory and are interpreted by a theory which takes into account the influence of the inhomogeneities.
Baggio-Saitovitch Elisa
Borges Herivelto
de Mello Evandro V. L.
Dias D. H. N.
Gomes A. A.
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