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• W2031002017 abstract "We report a comprehensive neutron-scattering study of the evolution of the magnetic excitations in ${mathrm{La}}_{2mathrm{ensuremath{-}}mathit{x}}$${mathrm{Sr}}_{mathit{x}}$${mathrm{CuO}}_{4}$ for 0ensuremath{le}xensuremath{le}0.04. We first present accurate measurements of the magnetic correlation length and the sublattice magnetization of a carrier-free ${mathrm{La}}_{2}$${mathrm{CuO}}_{4}$ crystal and analyze these in the context of recent theoretical predictions. We then systematically investigate the influence of different dopants on the magnetism: Our measurements indicate that static vacancies in the ${mathrm{La}}_{2}$${mathrm{Cu}}_{1mathrm{ensuremath{-}}mathit{y}}$${mathrm{Zn}}_{mathit{y}}$${mathrm{O}}_{4}$ system affect the magnetic correlations in a similar manner as electrons in ${mathrm{Pr}}_{2mathrm{ensuremath{-}}mathit{x}}$${mathrm{Ce}}_{mathit{x}}$${mathrm{CuO}}_{4}$. The magnetic correlation length is much more rapidly suppressed as a function of x in ${mathrm{La}}_{2mathrm{ensuremath{-}}mathit{x}}$${mathrm{Sr}}_{mathit{x}}$${mathrm{CuO}}_{4}$, and for xensuremath{le}0.04 we find that it obeys the empirical relation ${ensuremath{xi}}^{mathrm{ensuremath{-}}1}$(x,T)=${ensuremath{xi}}^{mathrm{ensuremath{-}}1}$(x,0)+${ensuremath{xi}}^{mathrm{ensuremath{-}}1}$(0,T), where ensuremath{xi}(0,T) is the measured correlation length of the carrier-free sample. We also report an extensive set of measurements of the dynamical magnetic response function of a crystal of composition ${mathrm{La}}_{1.96}$${mathrm{Sr}}_{0.04}$${mathrm{CuO}}_{4}$ for excitation energies 0.75ensuremath{le}ensuremath{omega}ensuremath{le}45 meV and temperatures 1.5ensuremath{le}Tensuremath{le}500 K.The dc conductivity of this crystal exhibits three different regimes: metallic for Tensuremath{ge}100 K, weakly localized for 100ensuremath{ge}Tensuremath{ge}10 K, and strongly localized below ensuremath{sim}1 K. Our neutron measurements show that the generalized susceptibility of this sample follows a surprisingly simple scaling function in the variable ensuremath{omega}/T. This observation allows us to relate our data to a variety of normal-state properties of the layered copper oxides, in particular the dc and ac conductivities. Finally, at temperatures below ensuremath{sim}20 K a ``central peak'' with a characteristic energy scale of less than 0.1 meV becomes prominent. Its relation to the localization of the charge carriers at low temperatures remains speculative." @default.
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• W2031002017 date "1992-12-01" @default.
• W2031002017 modified "2023-10-17" @default.
• W2031002017 title "Magnetic excitations in pure, lightly doped, and weakly metallic<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>La</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></…" @default.
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• W2031002017 doi "https://doi.org/10.1103/physrevb.46.14034" @default.
• W2031002017 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10003473" @default.
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