Changes in electron-phonon coupling across a bulk phase transition in copolymer films of vinylidene fluoride (70%) with trifluoroethylene (30%).

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We present evidence for a change in electron--phonon coupling across a bulk phase transition. Below the lattice stiffening transition at around 160 K, there is a change in the diffracted peak width observed by neutron and X-ray scattering techniques. Also, the electronic band structure of the copolymer is shifting in binding energy below 160 K, decreasing the density of states near the Fermi level. The value of the effective Debye temperature above the transition temperature is approximately 50 K, while below 160 K, the value of the Debye parameter is 245 K. We postulate that the coupling between electrons and ... continued below

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16 p.

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Borca, C. N.; Adenwalla, S.; Choi, J.; Robertson, L.; You, H.; Fridkin, V. M. et al. November 8, 2000.

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We present evidence for a change in electron--phonon coupling across a bulk phase transition. Below the lattice stiffening transition at around 160 K, there is a change in the diffracted peak width observed by neutron and X-ray scattering techniques. Also, the electronic band structure of the copolymer is shifting in binding energy below 160 K, decreasing the density of states near the Fermi level. The value of the effective Debye temperature above the transition temperature is approximately 50 K, while below 160 K, the value of the Debye parameter is 245 K. We postulate that the coupling between electrons and phonons results in a static distortion of the lattice (below 160 K), and this distortion ''melts'' above 160 K.

Physical Description

16 p.

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OSTI as DE00768608

Medium: P; Size: 16 pages

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  • 10th International Conference on Solid Films and Surfaces, Princeton, NJ (US), 07/09/2000--07/13/2000

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  • Report No.: ANL/MSD/CP-103305
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 768608
  • Archival Resource Key: ark:/67531/metadc716978

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  • November 8, 2000

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 7, 2017, 3:14 p.m.

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Borca, C. N.; Adenwalla, S.; Choi, J.; Robertson, L.; You, H.; Fridkin, V. M. et al. Changes in electron-phonon coupling across a bulk phase transition in copolymer films of vinylidene fluoride (70%) with trifluoroethylene (30%)., article, November 8, 2000; Illinois. (digital.library.unt.edu/ark:/67531/metadc716978/: accessed May 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.