Superconducting Volume Fraction in Overdoped Regime of La_2-x_Sr_x_CuO_4_: Implication for Phase Separation from Magnetic-Susceptibility Measurement

Abstract

We have grown a single crystal of La_2-x_Sr_x_CuO_4_ in which the Sr concentration, x, continuously changes from 0.24 to 0.29 in the overdoped regime and obtained many pieces of single crystals with different x values by slicing the single crystal. From detailed measurements of the magnetic susceptibility, chi, of each piece, it has been found that the absolute value of chi at the measured lowest temperature 2 K, |chi_2K_|, on field cooling rapidly decreases with increasing x as well as the superconducting (SC) transition temperature. As the value of |chi_2K_| is regarded as corresponding to the SC volume fraction in a sample, it has been concluded that a phase separation into SC and normal-state regions occurs in a sample of La_2-x_Sr_x_CuO_4_ in the overdoped regime.

arXiv comment4 pages, 3 figures, ver. 2 has been accepted in J. Phys. Soc. Jpn

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• c-Axis Transport and Resistivity Anisotropy of Lightly- to Moderately-Doped La_{2-x}Sr_{x}CuO_{4} Single Crystals: Implications on the Charge Transport Mechanism
• Muon-spin-relaxation and magnetic-susceptibility studies of the effects of nonmagnetic impurities on the Cu-spin dynamics and superconductivity in La_2-x_Sr_x_Cu_1-y_Zn_y_O_4_ around x = 0.115
• Electronic Specific Heat of La_{2-x}Sr_{x}CuO_{4}: Pseudogap Formation and Reduction of the Superconducting Condensation Energy
• Superfluid density of high-Tc cuprate systems: implication on condensation mechanisms, heterogeneity and phase diagram
• Raman study of carrier-overdoping effects on the gap in high-Tc superconducting cuprates
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Cited by in corpus (26)

• Progress in Neutron Scattering Studies of Spin Excitations in High-Tc Cuprates
• Disappearance of antiferromagnetic spin excitations in over-doped La${}_{2-x}$Sr${}_x$CuO${}_4$
• Disorder and superfluid density in overdoped cuprate superconductors
• Cuprate superconductors as viewed through a striped lens
• Fermiology and electronic homogeneity of the superconducting overdoped cuprate Tl-2201 revealed by quantum oscillations
• Weak coupling d-wave BCS superconductivity and unpaired electrons in overdoped La_{2-x}Sr_{x}CuO_{4} single crystals
• Cu-spin dynamics in the overdoped regime of La_2-x_Sr_x_Cu_1-y_Zn_y_O_4_ probed by muon spin relaxation
• 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
• Hidden itinerant-spin phase in heavily-overdoped La2-xSrxCuO4 revealed by dilute Fe doping: A combined neutron scattering and angle-resolved photoemission study
• Strongly-overdoped La${}_{2-x}$Sr${}_x$CuO${}_4$: Evidence for Josephson-coupled grains of strongly-correlated superconductor
• 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
• Superconducting Fluctuation investigated by THz Conductivity of La${}_{2-x}$Sr${}_x$CuO${}_4$ Thin Films
• 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
• Curie-like paramagnetism due to incomplete Zhang-Rice singlet formation in La2-xSrxCuO4
• 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
• In-plane optical spectra of Y${}_{1-x}$Ca${}_x$Ba${}_2$Cu${}_3$O${}_{7-\delta }$: Overdoping and disorder effect on residual conductivity
• Magnetic Impurity Effects on Ferromagnetic Fluctuations in Heavily Overdoped (Bi,Pb)${}_2$Sr${}_2$Cu${}_{1-y}$Fe${}_y$O${}_{6+\delta }$ Cuprates
• Enhancement of electronic anomalies in iron-substituted La_2-x_Sr_x_Cu_1-y_Fe_y_O_4_ around x=0.22
• Oxidation annealing effects on the spin-glass-like magnetism and appearance of superconductivity in T*-type La${}_{1-x/2}$Eu${}_{1-x/2}$Sr${}_x$CuO${}_4$ (0.14 $\le x\le$ 0.28)
• Muon spin relaxation study of the spin correlation in the overdoped regime of electron-doped high-Tc cuprate superconductors
• Interrelations among critical current density, irreversibility field and pseudogap in hole doped high-Tc cuprates
• Effects of Zn on the grain boundary properties of La2-xSrxCu1-yZnyO4 superconductors
• Emergence of Fermi-liquid and BCS physics in overdoped cuprates