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Adachi, Tadashi; Noji, Takashi; Koike, Yuya

doi:10.1103/physrevb.62.r11981

Cited by 40 publications

(26 citation statements)

References 29 publications

(37 reference statements)

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“…The details of the preparation of powders for the feed and solvent rods and the single-crystal growth have been reported elsewhere. 7,12 As-grown single-crystal rods were annealed in flowing O 2 gas of 1 bar at 900 o C for 50 h, cooled down to effect identical to each other. Both χ vs. T and M vs. H measurements were carried out in magnetic fields up to 7 T at low temperatures down to 2 K, using a superconducting quantum interference device (SQUID) magnetometer (Quantum Design, MPMS-XL7).…”

Section: Methodsmentioning

confidence: 99%

Magnetic-Field-Induced Enhancement of the Vortex Pinning in the Overdoped Regime of La_2-xSr_xCuO₄: Relation to the Microscopic Phase Separation

et al. 2007

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In order to investigate the inhomogeneity of the superconducting (SC) state in the overdoped high-T c cuprates, we have measured the magnetic susceptibility, χ, 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 χ in 1 T shows a plateau, that is, χ 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 c cuprates.

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Section: Methodsmentioning

confidence: 99%

Magnetic-Field-Induced Enhancement of the Vortex Pinning in the Overdoped Regime of La_2-xSr_xCuO₄: Relation to the Microscopic Phase Separation

et al. 2007

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“…3,4 In particular, around x = 0.22 in the overdoped regime of La 2−x Sr x CuO 4 (LSCO), significant anomalies have been observed thus far: a slight depression of the SC transition temperature T c , 5,6 the development of the Cu-spin correlation at low temperatures, 7 the enhancement of lattice instability by the application of a magnetic field, 8 and an anomalous insensitivity of the thermal conductivity to a magnetic field. 9 These are suggestive of a possible development of the stripe correlations of holes and spins 10 around x = 0.22, because these are analogous to those observed around x = 1/8 where the stripe correlations are much developed.…”

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confidence: 99%

Enhancement of Electronic Anomalies in Iron-Substituted La_2-xSr_xCu_1-yFe_yO₄ around x=0.22

et al. 2009

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Since the early stage of the research on high-T c superconductivity, much attention has been paid to the physics in the overdoped regime, e.g., the disappearance of the so-called pseudogap at a hole concentration per Cu, p, of ∼ 0.19, 1 a topological change of the Fermi surface, 2 a possible phase separation into superconducting (SC) and normal-state regions. 3,4 In particular, around x = 0.22 in the overdoped regime of La 2−x Sr x CuO 4 (LSCO), significant anomalies have been observed thus far: a slight depression of the SC transition temperature T c , 5, 6 the development of the Cu-spin correlation at low temperatures, 7 the enhancement of lattice instability by the application of a magnetic field, 8 and an anomalous insensitivity of the thermal conductivity to a magnetic field. 9 These are suggestive of a possible development of the stripe correlations of holes and spins 10 around x = 0.22, because these are analogous to those observed around x = 1/8 where the stripe correlations are much developed.Recently, Fujita et al. have revealed from their elastic neutron-scattering experiment that incommensurate magnetic peaks around (1/2, 1/2) in the reciprocal lattice unit are enhanced through the partial substitution of Fe for Cu in LSCO around p = 1/8. 11 Moreover, incommensurate elastic nuclear peaks around (0, 2) in the reciprocal lattice unit are observed in Fe-substituted samples around p = 1/8, while they are unobservable in an Fe-free sample of x = 0.12. 12 It is well known that superconductivity is strongly suppressed through Fe substitution in the whole SC regime. 13, 14 Therefore, Fujita et al. 11 have suggested that Fe substitution is effective for the stabilization of the charge-spin stripe order around p = 1/8.In this study, we have investigated Fe-substitution effects on electronic properties around x = 0.22 in the overdoped regime of LSCO by measuring the electrical resistivity ρ and the magnetic susceptibility χ.Polycrystalline samples of 1 % Fe-substituted La 2−x Sr x Cu 1−y Fe y O 4 with y = 0.01 were prepared by the ordinary solid-state reaction method. The details have been reported in our previous paper. 5 All the samples were checked by powder X-ray diffraction analysis to be of

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“…The details of the preparation of powders for the feed and solvent rods have been reported elsewhere. 8 For the feed rod, stoichiometric powders of LSCO with x = 0.25, 0.26, 0.27, 0.28, 0.29, 0.30 were prepared. Then, the obtained fine powders of each x were placed into a thin-walled rubber tube in order and formed into a cylindrical rod under hydrostatic pressure.…”

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Superconducting Volume Fraction in Overdoped Regime of La_2-xSr_xCuO₄: Implication for Phase Separation from Magnetic-Susceptibility Measurement

et al. 2005

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We have grown a single crystal of La2−xSrxCuO4 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, χ, of each piece, it has been found that the absolute value of χ at the measured lowest temperature 2 K, |χ2K|, on field cooling rapidly decreases with increasing x as well as the superconducting (SC) transition temperature. As the value of |χ2K| 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 La2−xSrxCuO4 in the overdoped regime.KEYWORDS: phase separation, La2−xSrxCuO4, magnetic susceptibility, Sr-concentration-gradient single crystal, superconducting volume fractionThe study of the electronic states of high-T c cuprates has been a central issue to elucidate the mechanism of high-T c superconductivity. Compared with the underdoped regime in which extensive studies have been carried out, physical properties in the overdoped regime have not been so clarified. The microscopic electronic inhomogeneity in the CuO 2 plane suggested from scanning-tunneling-microscopy (STM) measurements was a sensational observation.1 In optimally doped Bi 2 Sr 2 CaCu 2 O 8+δ (Bi-2212), it was suggested that both the local density of states and the superconducting (SC) gap were spatially inhomogeneous. Such electronic inhomogeneity was observed in slightly underdoped and overdoped Bi-2212 as well.2 However, the inhomogeneity in the CuO 2 plane has still been a controversial issue, because STM measurements are very sensitive to the surface electronic state, which may sometimes be rather different from the bulk one. In order to confirm the inhomogeneity, measurements reflecting bulk properties of a sample are absolutely required.As for the electronic inhomogeneity in the overdoped regime, transverse-field muon-spin-relaxation (µSR) measurements in the overdoped regime of Tl 2 Ba 2 CuO 6+δ revealed that the muon-spin depolarization rate in the ground state, regarded as being proportional to the SC carrier density divided by the effective mass, n s /m * , decreased with an increase in the hole concentration, p.3, 4 It was speculated that a microscopic phase separation into SC and normal-state regions occurred in the overdoped high-T c cuprates.5 Similar results were also obtained from the µSR measurements in the overdoped regime of (Y, Ca)Ba 2 Cu 3 O 7−δ (Y/Ca-123) and Tl 1−y Pb y Sr 2 Ca 1−y Y y Cu 2 O 7 . 6One conclusive way to prove the phase separation is to study the SC volume fraction. Formerly, Nagano et al. reported from measurements of the magnetic susceptibility, χ, in La 2−x Sr x CuO 4 (LSCO) that the shielding volume * E-mail address: adachi@teion.apph.tohoku.ac.jp fraction, obtained from χ at 4.2 K on zero-field cooling using a bulk sample, was almost 100% in the range 0.07 ≤ x ≤ 0.27.7 They insisted that the SC...

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Giant suppression of superconductivity atx=0.21in the Zn-substitutedLa2−x

Cited by 40 publications

References 29 publications

Magnetic-Field-Induced Enhancement of the Vortex Pinning in the Overdoped Regime of La_2-xSr_xCuO₄: Relation to the Microscopic Phase Separation

Magnetic-Field-Induced Enhancement of the Vortex Pinning in the Overdoped Regime of La_2-xSr_xCuO₄: Relation to the Microscopic Phase Separation

Enhancement of Electronic Anomalies in Iron-Substituted La_2-xSr_xCu_1-yFe_yO₄ around x=0.22

Superconducting Volume Fraction in Overdoped Regime of La_2-xSr_xCuO₄: Implication for Phase Separation from Magnetic-Susceptibility Measurement

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Giant suppression of superconductivity atx=0.21in the Zn-substitutedLa2−x

Cited by 40 publications

References 29 publications

Magnetic-Field-Induced Enhancement of the Vortex Pinning in the Overdoped Regime of La2-xSrxCuO4: Relation to the Microscopic Phase Separation

Magnetic-Field-Induced Enhancement of the Vortex Pinning in the Overdoped Regime of La2-xSrxCuO4: Relation to the Microscopic Phase Separation

Enhancement of Electronic Anomalies in Iron-Substituted La2-xSrxCu1-yFeyO4 around x=0.22

Superconducting Volume Fraction in Overdoped Regime of La2-xSrxCuO4: Implication for Phase Separation from Magnetic-Susceptibility Measurement

Contact Info

Product

Resources

About

Magnetic-Field-Induced Enhancement of the Vortex Pinning in the Overdoped Regime of La_2-xSr_xCuO₄: Relation to the Microscopic Phase Separation

Magnetic-Field-Induced Enhancement of the Vortex Pinning in the Overdoped Regime of La_2-xSr_xCuO₄: Relation to the Microscopic Phase Separation

Enhancement of Electronic Anomalies in Iron-Substituted La_2-xSr_xCu_1-yFe_yO₄ around x=0.22

Superconducting Volume Fraction in Overdoped Regime of La_2-xSr_xCuO₄: Implication for Phase Separation from Magnetic-Susceptibility Measurement