2010/10/29 by A. Marcinkova, T. C. Hansen, Thomas C. Hansen +5
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #cond-mat.mtrl-sci #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.82.174438
published as Phys. Rev. B 82, 174438 (2010)
arxiv created 2010/10/29 · openalex publication_date 2010/11/29 · arxiv updated 2010/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A combination of synchrotron x-ray, neutron powder-diffraction, magnetization, heat-capacity, and electrical-resistivity measurements reveals that NdMnAsO is an antiferromagnetic semiconductor with large Neel temperature [TN=359(2) K]. At room temperature the magnetic propagation vector k=0 and the Mn moments are directed along the crystallographic c axis [mMn=2.41(6) \ensuremathμB]. Upon cooling a spin-reorientation (SR) transition of the Mn moments into the ab plane occurs (TSR=23 K). This coincides with the long-range ordering of the Nd moments, which are restricted to the basal plane. The magnetic propagation vector remains k=0. At base temperature (1.6 K) the fitted moments are mab,Mn=3.72(1) \ensuremathμB and mab,Nd=1.94(1) \ensuremathμB. The electrical resistivity is characterized by a broad maximum at 250 K, below which it has a metallic temperature dependence but semiconducting magnitude (\ensuremathρ250 K=50 \ensuremathΩ cm, residual resistivity ratio=2), and a slight upturn at the SR transition.