Entropy driven formation of a half-quantum vortex lattice

Details Entropy driven formation of a half-quantum vortex lattice Entropy driven formation of a half-quantum vortex lattice

2010-09-28

arxiv.org/abs/1009.5719v2

Phys. Rev. B 82, 214512 (2010)

Physics

Condensed Matter

Superconductivity

12 pages, 2 figures; published version

Scientific paper

Half-quantum vortices (HQVs) can exist in a superconductor or superfluid with an exact or approximate U(1) \times U(1) symmetry, for instance in spinor condensates, 3He-A, Sr2RuO4, and possibly cuprate superconductors with stripe order. In this paper, we show that a lattice of HQVs can be stabilized at finite temperature even when it does not have lower energy than the lattice of full vortices at T = 0 since there is a gain in configurational entropy when a full vortex fractionalizes into a pair of HQVs. Specifically, the lattice of HQVs has an optical branch of phonon modes absent in the lattice of full vortices. Moreover, the HQV lattice at T > 0 can have a different structure than the HQV lattice at T = 0.

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