Commensurate Spin Density Wave in LaOFeAs: A Local Probe Study

Abstract

We present a detailed study on the magnetic order in the undoped mother compound LaOFeAs of the recently discovered Fe-based superconductor LaO${}_{1-x}$F${}_x$FeAs. In particular, we present local probe measurements of the magnetic properties of LaOFeAs by means of ${}^{57}$Fe Mössbauer spectroscopy and muon spin relaxation in zero external field along with magnetization and resistivity studies. These experiments prove a commensurate static magnetic order with a strongly reduced ordered moment of 0.25(5) ${\mu }_B$ at the iron site below T_N = 138 K, well separated from a structural phase transition at T_N = 156 K. The temperature dependence of the sublattice magnetization is determined and compared to theory. Using a four-band spin density wave model both, the size of the order parameter and the quick saturation below T_N are reproduced.

5 pages, 5 figures

References in corpus (3)

• Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO${}_{1-x}$F${}_x$FeAs
• Proximity of antiferromagnetism and superconductivity in LaO${}_{1-x}$F${}_x$FeAs: effective Hamiltonian from ab initio studies
• Hall effect and magnetoresistance in the normal state of the superconductor LaO${}_{0.9}$F${}_{0.1-x}$FeAs

Cited by in corpus (9)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Magnetism, superconductivity, and pairing symmetry in Fe-based superconductors
• Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering
• Magnetic and structural transitions in layered FeAs systems: AFe2As2 versus RFeAsO compounds
• Strong coupling between magnetic and structural order parameters in SrFe2As2
• Lattice Dynamics of LaFeAsO_{1-x}F_{x} and PrFeAsO_{1-y} via Inelastic X-Ray Scattering and First-Principles Calculation
• Effective Hamiltonian for FeAs based superconductors
• Doping evolution of itinerant magnetic excitations in Fe-based oxypnictides
• Cu, Pu and Fe high Tc superconductors: all the same mechanism!