Magnetic-field-induced enhancement of the vortex pinning in the overdoped regime of La${}_{2-x}$Sr${}_x$CuO${}_4$ : Relation to the microscopic phase separation

Abstract

In order to investigate the inhomogeneity of the superconducting (SC) state in the overdoped high-$T_{\mathrm{c}}$ cuprates, we have measured the magnetic susceptibility, $\chi$, of La${}_{2-x}$Sr${}_x$CuO${}_4$ (LSCO) single crystals in the overdoped regime in magnetic fields parallel to the c-axis up to 7 T on warming after zero-field cooling. It has been found for $x$ = 0.198 and 0.219 that the temperature dependence of $\chi$ in 1 T shows a plateau, that is, $\chi$ is almost independent of temperature in a moderate temperature-range in the SC state. Moreover, a so-called second peak in the magnetization curve has markedly appeared in these crystals. These results indicate an anomalous enhancement of the vortex pinning and strongly suggest the occurrence of a $microscopic$ phase separation into SC and normal-state regions in the overdoped high-$T_{\mathrm{c}}$ cuprates.

arXiv comment4 pages, 4 figures

References in corpus (4)

• Discovery of microscopic electronic inhomogeneity in the high-Tc superconductor Bi2Sr2CaCu2O8+x
• Anomalous peak in the superconducting condensate density of cuprate high T_{c} superconductors at a unique critical doping state
• Superconducting Volume Fraction in Overdoped Regime of La_2-x_Sr_x_CuO_4_: Implication for Phase Separation from Magnetic-Susceptibility Measurement
• Intrinsic Percolative Superconductivity in Heavily Overdoped High Temperature Superconductors

Cited by in corpus (9)

• Effects of Zn and Ni substitution on the Cu-spin dynamics and superconductivity in La_2-x_Sr_x_Cu_1-y_(Zn,Ni)_y_O_4_ with x=0.15-0.20 studied by the muon spin relaxation and magnetic susceptibility
• Strongly-overdoped La${}_{2-x}$Sr${}_x$CuO${}_4$: Evidence for Josephson-coupled grains of strongly-correlated superconductor
• Hole-trapping by Ni, Kondo effect and electronic phase diagram in non-superconducting Ni-substituted La2-xSrxCu1-yNiyO4
• Change of the Ground State upon Hole Doping Unveiled by Ni Impurity in High-$T_{\mathrm{c}}$ Cuprates
• Distinct Fe-induced magnetic states in the underdoped and overdoped regimes of La2-xSrxCu1-yFeyO4 revealed by muon spin relaxation
• Secondary peak on asymmetric magnetization loop of type-II superconductors
• Magnetic-susceptibility and specific-heat studies on the inhomogeneity of superconductivity in the underdoped La_2-x_Sr_x_CuO_4_
• High-field muSR studies of superconducting and magnetic correlations in cuprates above Tc
• Evidence for a square-square vortex lattice transition in a high-$T_{\text{c}}$ cuprate superconductor