An unexpected gap: Magnetic structures of La2O3(Fe1-xMnx)(2)Se-2 investigated by neutron diffraction and physical property measurements

作者：Landsgesell S^*; Prokes K; Hansen T; Frontzek M

来源：Acta Materialia, 2014, 66: 232-240.

DOI：10.1016/j.actamat.2013.11.072

• Iron oxyselenides
• Iron superconductors
• Neutron diffraction

We prepared a solid solution of La2O3(Fe1-xMnx)(2)Se-2 and performed elastic neutron diffraction experiments at 2 K, measured the magnetization from 2 to 300 K at 500 Oe and 10 T, and also performed resistivity measurements for selected samples. Our experiments show that atomic disorder and magnetic competition open a gap in the magnetic transition from the AFM3 order (x < 0.1) to the AFM1 order (x >= 0.3) while the transition from AFM1(x) (0.3 < x <= 0.9) to AFM1(z) (x > 0.9) appears to be seamless. The compositions at 0.10 < x < 0.25 did not show any long-range magnetic order in neutron scattering experiments and are semiconducting to insulating until 2 K. However, material with this composition may be a very interesting candidate for further investigations due to the high degree of magnetic competition in this range of the La2O3(Fe1-x,Mn-x)(2)Se-2 system.

• 出版日期2014-3