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• W2005233181 abstract "The soft optical phonons associated with the tetragonal-to-orthorhombic structural phase transition in ${mathrm{La}}_{2mathrm{ensuremath{-}}mathrm{x}}$${mathrm{Sr}}_{mathrm{x}}$${mathrm{CuO}}_{4mathrm{ensuremath{-}}mathrm{y}}$ have been investigated using inelastic-neutron-scattering techniques. Single crystals with Sr concentration of x=0, 0.08, and 0.14 were studied. Both branches of the doubly degenerate X-point phonon which go soft at the tetragonal-to-orthorhombic transition have been observed in the orthorhombic phase. In all three samples one branch hardens, while the other remains relatively soft with behavior indicative of a further incipient structural phase transition. We identify the hard and soft branches of the orthorhombic phase as zone center and zone-boundary phonons, respectively. The zone-center mode has ${A}_{g}$ symmetry and is, consequently, Raman active. The relation of these measurements to other structural properties and to the superconductivity in ${mathrm{La}}_{2mathrm{ensuremath{-}}mathrm{x}}$${mathrm{Sr}}_{mathrm{x}}$${mathrm{CuO}}_{4mathrm{ensuremath{-}}mathrm{y}}$ is discussed." @default.
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• W2005233181 date "1989-03-01" @default.
• W2005233181 modified "2023-10-18" @default.
• W2005233181 title "Neutron scattering study of soft optical phonons in<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:mi mathvariant=normal>−</mml:mi><mml:mi mathvariant=normal>x</mml:mi></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>Sr</mml:mi…" @default.
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• W2005233181 doi "https://doi.org/10.1103/physrevb.39.4327" @default.
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