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- W1995333072 abstract "A room-temperature structural phase diagram has been determined in (${mathrm{La}}_{1mathrm{ensuremath{-}}mathit{x}}$${mathrm{Gd}}_{mathit{x}}$${)}_{1.85}$${mathrm{Sr}}_{0.15}$${mathrm{CuO}}_{4}$ system (0ensuremath{le}xensuremath{le}1). There exist three stable phases (T, ${T}^{mathrm{*}}$ and T'), in which the local Cu-O unit is an octahedron, a pyramid, and a square, respectively. The Jahn-Teller distortion is reduced in the order of T, ${T}^{mathrm{*}}$, and T'. For each phase, there is a solubility region. No magnetic ordering is found in the T and ${T}^{mathrm{*}}$ phase, both of which exhibit paramagnetism with a constant Gd magnetic moment consistent with that of ${mathrm{Gd}}^{3+}$. In ${mathrm{Gd}}_{2}$${mathrm{CuO}}_{4}$ and ${mathrm{Gd}}_{1.85}$${mathrm{Sr}}_{0.15}$${mathrm{CuO}}_{4}$, the initial susceptibility indicates a N'eel state in the Cu-${mathrm{O}}_{2}$ plane at ${T}_{N}$=285 K and another magnetic transition at low temperature. ${T}_{N}$ is not sensitive to the Sr doping at all, indicating that extra holes cannot be doped onto the Cu-${mathrm{O}}_{2}$ plane. While the ${T}^{mathrm{*}}$ and T' phases are insulating, exhibiting a variable-range hopping behavior, the Gd-doped (${mathrm{La}}_{1mathrm{ensuremath{-}}mathit{x}}$${mathrm{Gd}}_{mathit{x}}$${)}_{1.85}$${mathrm{Sr}}_{0.15}$${mathrm{CuO}}_{4}$ (xensuremath{le}0.1) is superconducting with ${T}_{c}$ reducing with increasing Gd concentration. The suppression of ${T}_{c}$ is not due to a variation of the electron-boson coupling strength which remains unchanged in the system, but correlates closely with the low-temperature resistivity anomaly. Such an anomaly can be best described by a logarithmic temperature dependence." @default.
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- W1995333072 date "1989-09-01" @default.
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- W1995333072 title "Systematic study of (La1−xGdx)1.85Sr0.15CuO4(0≤x≤1): Structure, superconductivity, resistivity, and magnetic properties" @default.
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- W1995333072 doi "https://doi.org/10.1103/physrevb.40.4538" @default.
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