Commensurate Spin Density Wave in LaOFeAs: A Local Probe Study

Details Commensurate Spin Density Wave in LaOFeAs: A Local Probe Study Commensurate Spin Density Wave in LaOFeAs: A Local Probe Study

2008-05-02

arxiv.org/abs/0805.0264v2

Phys. Rev. Lett. 101, 077005 (2008)

Physics

Condensed Matter

Superconductivity

5 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.101.077005

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 M\"ossbauer 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.

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