A model is proposed in which the quantum tunneling of the apex oxygen atom is coupled to the quasiparticle excitations of the superconducting state. A path-integral formulation allows one to renormalize the coupling constant as a function of temperature. It is shown that such a model can account for the anomalous low-temperature specific heat observed in high-Tc YBa2Cu3O7-δ superconductors.
Apex-oxygen-atom tunneling as source of anomalous low-temperature specific heat in high-Tc superconductors
ZOLI, Marco
1991-01-01
Abstract
A model is proposed in which the quantum tunneling of the apex oxygen atom is coupled to the quasiparticle excitations of the superconducting state. A path-integral formulation allows one to renormalize the coupling constant as a function of temperature. It is shown that such a model can account for the anomalous low-temperature specific heat observed in high-Tc YBa2Cu3O7-δ superconductors.File in questo prodotto:
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