Ising and Spin orders in Iron-Based Superconductors

By Cenke Xu, Markus P. Mueller, S. Sachdev. 2008

277 citations recorded by the source corpus.

Motivated by recent neutron scattering experiments, we study the ordering of spins in the iron-based superconductors $\mathrm{LaFeAs}({\mathrm{O}}_{1\ensuremath{-}x}{\mathrm{F}}_{x})$, assuming them in proximity to a Mott insulator in the phase diagram. The ground state of the parent system with $x=0$ is a spin-density wave with ordering wave vector $\stackrel{P\vec}{Q}=(0,\ensuremath{\pi})$ or $(\ensuremath{\pi},0)$. Upon raising the temperature, we find that the system restores SU(2) symmetry, while an Ising symmetry remains broken, explaining the experimentally observed lattice distortion to a monoclinic crystal structure. Upon further temperature increase, the spins finally disorder at a second transition. The phase transition driven by doping with charge carriers similarly splits into an $\mathrm{O}(3)$ transition and an Ising transition with $z=3$ at larger doping.

Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/83a75df21230378871a090b022074769831bd732

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Condensed Matter Physics

1. E. Dagotto
2. R. Fernandes
3. J. Schmalian
4. P. Dai
5. A. Chubukov
6. Jiangping Hu
7. Zhi-xun Shen
8. John R. Kirtley

In Electronic, Optical and Magnetic Materials

1. E. Dagotto
2. R. Fernandes
3. P. Dai
4. J. Schmalian
5. A. Chubukov
6. Jiangping Hu
7. Zhi-xun Shen
8. L. Degiorgi

Citations in the corpus

• Magnetism and its microscopic origin in iron-based high-temperature superconductors (2012, background): “[46] Xu, C.”
• In-plane electronic anisotropy of underdoped ‘122’ Fe-arsenide superconductors revealed by measurements of detwinned single crystals (2011, background): “…orthorhombic transition has been discussed from the closely related perspectives of spin fluctuations (i.e. spin-driven nematicity (Fang et al 2008, Xu et al 2008, Mazin and Johannes 2009, Fernandes et al 2010, Fradkin et al 2010)), and also in terms of a more direct electronic effect involving,…”
• Nematic order in iron superconductors - who is in the driver's seat? (2013, background): “This additional tetragonal symmetry breaking enhances the order parameter manifold to O(3)× Z2 [28, 29].”
• Fundamental studies of superconductors using scanning magnetic imaging (2010, background): “and magnetic properties, leading some authors to describe the lattice and spin densitywave transition by a single order parameter [276, 277].”