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Anti-Correlation between Energy-Gap and Phonon Energy for Cuprate Bi2212 Superconductor |
| FAN Wei |
| Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 |
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FAN Wei 2008 Chin. Phys. Lett. 25 2217-2220 |
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Abstract Using the electron--phonon mechanism, we explain the spatial anti-correlation between the energy-gap and the energy of phonon mode for cuprate superconductor found in tunnelling spectrum by STM measurements of Bi2212, which is the direct effect of an important relationship (or constraint) I=const, where I is superconducting parameters. By relaxing above constraint, we study the correlation of energy gap and phonon energy
when I has a distribution. We calculate a map of transition temperature in space constructing by phonon energy and the parameter of electron--phonon interaction, which is helpful for understanding of the relation.
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| Keywords:
74.20.Fg
74.25.Kc
74.62.-c
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Received: 22 October 2007
Published: 31 May 2008
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| PACS: |
74.20.Fg
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(BCS theory and its development)
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74.25.Kc
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(Phonons)
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74.62.-c
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(Transition temperature variations, phase diagrams)
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