Abstract
We present a functional renormalization group (FRG) analysis of a Landau-Ginzburg model of type-II superconductors (generalized to n/2 complex fields) in a magnetic field, for both a pure and a disordered system. The disordered system supports a stable FRG fixed point for 1 <n <4, identical to that of the disordered O(n) model in d - 2 dimensions. The pure system has a stable fixed point only for n > 4 indicating a first order transition for n = 2. We speculate that the recent experimental findings that disorder removes the first order transition are consistent with these calculations.
| Original language | English |
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| Pages (from-to) | 533-536 |
| Number of pages | 4 |
| Journal | Physical Review Letters |
| Volume | 75 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 17 Jul 1995 |