The influence of anharmonic phonons on the isotope effect in high- Tc oxides

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Anharmonic phonons are examined to study the unusual isotope effect exponents for the high-{Tc} oxides. Within a simple model of anharmonicity, the mass dependences of the electron-phonon coupling constant {lambda} and the phonon frequency determine the isotope effect exponent {alpha} as a function of coupling strength. A model in which the outer wells of a multiple-well potential deepen as the orthorhombic/low temperature tetragonal phase transition in La{sub 2-x}M{sub x}CuO{sub 4} is approached is consistent with some experimentally observed variations in {Tc} and {alpha}. 10 refs.

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6 pages

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Crespi, V.H. & Cohen, M.L. January 1, 1992.

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Anharmonic phonons are examined to study the unusual isotope effect exponents for the high-{Tc} oxides. Within a simple model of anharmonicity, the mass dependences of the electron-phonon coupling constant {lambda} and the phonon frequency determine the isotope effect exponent {alpha} as a function of coupling strength. A model in which the outer wells of a multiple-well potential deepen as the orthorhombic/low temperature tetragonal phase transition in La{sub 2-x}M{sub x}CuO{sub 4} is approached is consistent with some experimentally observed variations in {Tc} and {alpha}. 10 refs.

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6 pages

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OSTI; NTIS; GPO Dep.

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  • Lattice effects in high Tc superconductors, Santa Fe, NM (United States), 13-15 Jan 1992

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  • Other: DE92017083
  • Report No.: LBL-31865
  • Report No.: CONF-920141--8
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 5132046
  • Archival Resource Key: ark:/67531/metadc1059790

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  • January 1, 1992

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  • Jan. 22, 2018, 7:23 a.m.

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  • May 24, 2019, 1:44 p.m.

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Crespi, V.H. & Cohen, M.L. The influence of anharmonic phonons on the isotope effect in high- Tc oxides, article, January 1, 1992; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc1059790/: accessed June 12, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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