High impact of spin-nematic order on the lattice domains in thin films of iron-based superconductors

Details High impact of spin-nematic order on the lattice domains in thin films of iron-based superconductors High impact of spin-nematic order on the lattice domains in thin films of iron-based superconductors

2011-03-16

arxiv.org/abs/1103.3302v1

Phys. Rev. B 84, 012504 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figs

Scientific paper

10.1103/PhysRevB.84.012504

The spin-nematic scenario proposed for the structural instability of iron-based superconductors is studied theoretically within a Ginzburg-Landau approach in epitaxial thin films. The transition temperature and the domains that appear due the interface with the substrate are computed analytically by following a variatonal procedure. It is predicted a cross-over thickness $l_*$ that separates the Kittel regime, in which the size of the domains goes as the square root of the film thickness $l$, from a new ultrathin regime in which the system tends to reach the single-domain state as $l \to 0$. The experimental observation of this cross-over is therefore proposed as a direct probe of spin nematiciy.

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