Maqola

Phonon density of states of superconducting Y<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ba</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">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</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">O</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and the nonsuperconducting analog Y<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ba</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">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</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">O</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

J. J. RhyneInstitute for Materials Science and Engineering, National Bureau of Standards, Gaithersburg, Maryland 20899D. A. NeumannInstitute for Materials Science and Engineering, National Bureau of Standards, Gaithersburg, Maryland 20899J. A. GotaasInstitute for Materials Science and Engineering, National Bureau of Standards, Gaithersburg, Maryland 20899F. BeechInstitute for Materials Science and Engineering, National Bureau of Standards, Gaithersburg, Maryland 20899L. E. TothCeramics Branch, Naval Research Laboratory, Washington, D.C. 20375S. H. LawrenceCeramics Branch, Naval Research Laboratory, Washington, D.C. 20375Stefan WolfInstitute for Materials Science and Engineering, National Bureau of Standards, Gaithersburg, Maryland 20899M. S. OsofskyInstitute for Materials Science and Engineering, National Bureau of Standards, Gaithersburg, Maryland 20899D. U. GubserInstitute for Materials Science and Engineering, National Bureau of Standards, Gaithersburg, Maryland 20899

1987lv

ABI

Annotatsiya

Neutron scattering has been used to study the vibrational density of states and the atomic structure of the high-temperature superconductor Y${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$, and the analogous nonsuperconducting compound Y${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{6}$. The density of states of the superconductor shows a strong double peak at about 20 meV and a second major maximum near 70 meV with additional less-intense features present at intermediate energies. The Y${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{6}$ material shows a similar energy spectrum above 45 meV; however, below this energy there are significant differences associated with the O vacancies in the linear $b$-axis chain site.

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Identifikatorlar

DOI: 10.1103/physrevb.36.2294

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