Q.R. Huang, Ho-Cheol Kim, et al.
Macromolecules
We investigate the transition temperature of layered superconductors by considering a stack of Lz superconducting layers, separated by insulating material. We adopt a pairing Hamiltonian, invoke the variational principle and solve the resulting gap equations numerically. Our results confirm previous weak coupling and Ginzburg-Landau treatments and reveal a rise of Tc with Lz and saturation at the bulk transition temperature. Thus, the rise of Tc is traced back to a finite size effect, corresponding to a crossover from 2-d to 3-d superconductivity. The results also reveal a sizeable variation of the gap along the stack with pronounced variation at the ends. © 1991 Springer-Verlag.
Q.R. Huang, Ho-Cheol Kim, et al.
Macromolecules
Xikun Hu, Wenlin Liu, et al.
IEEE J-STARS
Arvind Kumar, Jeffrey J. Welser, et al.
MRS Spring 2000
P. Martensson, R.M. Feenstra
Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films