The vortex core radius ρv, defined as the peak position of the supercurrent around the vortex, has been determined by muon spin rotation measurements in the mixed state of La2 − xSrxCuO4 for x = 0.13, 0.15, and 0.19. At lower doping (x=0.13 and 0.15), ρv(T) increases with decreasing temperature T, which is opposite to the behavior predicted by the conventional theory. Moreover, ρv(T→0)is significantly larger than the Ginzburg-Landau coherence length determined by the upper critical field, and shows a clear tendency to decrease with increasing the doping x. These features can be qualitatively reproduced in a microscopic model involving antiferromagnetic electronic correlations.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Mar 24 2004|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics