Superconductivity in the presence of a pseudogap induced by local charge density waves

 

Chem. Met. Alloys 4 (2011) 50-57

 

Radoslaw SZCZĘŚNIAK, Dominik SZCZĘŚNIAK

 

A model describing the thermodynamic properties of a superconducting phase in the presence of a pseudogap induced by local charge density waves is presented in the paper. Within the framework of the model calculations it is shown that the obtained phase diagram reproduces properly, in a qualitative way, the phase diagram of the superconducting state for BaPb1−xBixO3. It is further shown that the pseudogap very strongly reduces the value of the order parameter for the superconducting phase, whereas the value of the electron effective mass and the energy shift function are independent of the pseudogap.

 

 

(A) Phase diagram predicted by the classical Eliashberg theory. (B) Experimentally determined phase diagram for BPBO. In both figures Tc denotes the critical temperature; x ~ ánñ was assumed, where ánñ is the average number of electrons at the node.

 

Keywords

Superconductors / Thermodynamic properties