Mode softening and high superconducting transition temperature in some A-15 compounds

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The electronic density of states at the Fermi level, N(E/sub F/), and the geometric mean phonon frequencies, $omega$/sub g/, were determined from heat- capacity data for a number of A-15 superconductors. Although $omega$/sub g/ is an appropriate average phonon parameter for evaluating McMillan's expression for lambda, it was found that the T/sub c/ values cannot be reliably estimated using $omega$/sub g/. There are, however, strong correlations between lambda, N(E/sub F/), and the temperature dependence of $omega$/sub g/, dln$omega$/sub g//dT. The high-T/sub c/, high-N(E/sub F/) materials V$sub 3$Si and V$sub 3$Ga show the largest phonon-mode softening on cooling. It is proposed ... continued below

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7 p.

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Knapp, G. S.; Bader, S. D. & Fisk, Z. January 1, 1975.

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The electronic density of states at the Fermi level, N(E/sub F/), and the geometric mean phonon frequencies, $omega$/sub g/, were determined from heat- capacity data for a number of A-15 superconductors. Although $omega$/sub g/ is an appropriate average phonon parameter for evaluating McMillan's expression for lambda, it was found that the T/sub c/ values cannot be reliably estimated using $omega$/sub g/. There are, however, strong correlations between lambda, N(E/sub F/), and the temperature dependence of $omega$/sub g/, dln$omega$/sub g//dT. The high-T/sub c/, high-N(E/sub F/) materials V$sub 3$Si and V$sub 3$Ga show the largest phonon-mode softening on cooling. It is proposed that, for the higher- N(E/sub F/) materials, particular phonon-modes strongly couple to the electronic system and enhance T/sub c/ to a greater extent than average phonon properties would indicate. (auth)

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7 p.

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Dep. NTIS

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  • International conference on low lying lattice vibrational models and their relationship to superconductivity and ferroelectricity, San Juan, Puerto Rico, 1 Dec 1975

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  • Report No.: CONF-751212--3
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 4117888
  • Archival Resource Key: ark:/67531/metadc871736

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  • January 1, 1975

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  • Sept. 16, 2016, 12:32 a.m.

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  • Oct. 11, 2017, 2:08 p.m.

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Knapp, G. S.; Bader, S. D. & Fisk, Z. Mode softening and high superconducting transition temperature in some A-15 compounds, article, January 1, 1975; Illinois. (digital.library.unt.edu/ark:/67531/metadc871736/: accessed June 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.