Abstract
The theory of topological phase transitions predicts a universal relation between the vortex-unbinding temperature Tc and the areal superelectron density ns(Tc) in two-dimensional superconductors. Evaluating ns(Tc) with the theory of dirty superconductors leads to a relation between Tc and the normal-state sheet resistance RN-. This latter relation, however, must be modified to account for the distinction between the unrenormalized ns0 and the renormalized value nsR, in the critical region near Tc. This can be expressed via a nonuniversal parameter c=ns0(Tc)nsR(Tc), which depends in turn for homogeneous films on N0, the density of statistically independent vortices within an area 2. For the Hg-Xe thin films studied earlier, we find that c=1.20.1 and N0=0.050.03.
Original language | English (US) |
---|---|
Pages (from-to) | 3950-3953 |
Number of pages | 4 |
Journal | Physical Review B |
Volume | 26 |
Issue number | 7 |
DOIs | |
State | Published - 1982 |