Effect of order parameter fluctuations on the Halperin-Lubensky-Ma first-order transition in superconductors and liquid crystals
Department of Physics, Simon Fraser University
Burnaby, British Columbia, Canada V5A 1S6
2 Physics Department, University of Utrecht, and FOM Institute for Atomic and Molecular Physics - The Netherlands
Accepted: 18 May 2001
We show that order parameter fluctuations in a good type-I superconductor or a liquid crystal always increase the size of the first-order transition. This behavior is eventually changed when the system crosses over to an inverted-XY critical behavior, with the size of the first-order transition vanishing as a power law with a crossover exponent. We find good agreement between our theory and a recent experiment on the nematic-smectic-A first-order transition in 8CB-10CB mixtures of liquid crystals.
PACS: 05.70.Fh – Phase transitions: general studies / 05.70.Jk – Critical point phenomena / 64.70.Md – Transitions in liquid crystals
© EDP Sciences, 2001