Resonant ionic bonding and high TC superconductivity

A. Widom, T. Yuan, H. Jiang and C. Vittoria

Physica A: Statistical Mechanics and its Applications, 1994, vol. 210, issue 3, 496-506

Abstract: The implications of an electronic coupling model in high TC superconductors of YBCO are discussed in which the pairing mechanism is based upon the ionic bonding. Specifically,the bonding reaction Cu + O [rlhar2] Cu-- resonates at a frequency of I2πh̵; in the CuO planes, where I = 0.4 eV is the ionic bonding energy. We formulate an Hamiltonian which allows for the reduction of the total energy by I each time two holes or two electrons form a pair. The total energy consists of kinetic energy calculable from band theory, and the ionic bonding energy proportional to I. We calculate (i) the effective Ginzburg-Landau free energy for all T < Tc, (ii) the energy gap, (iii) the anisotropic London penetration depths, and (iv) the anisotropic coherence lengths. General agreement is found between our calculations and experimental data.

Date: 1994
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Citations: View citations in EconPapers (5)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:210:y:1994:i:3:p:496-506

DOI: 10.1016/0378-4371(94)90096-5

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