2018/07/31 by A. Dahal, Ashutosh Dahal, Yiyao Chen +7 · 2 citations
Chemistry · Materials Science · Physics and Astronomy · #Antiferromagnetism #Chemistry #Condensed matter physics #Crystal structure #Crystallography #Iron-based superconductors research #Materials science #Physics #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Spin (aerodynamics) #Spins #Tetragonal crystal system #Thermodynamics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.99.085135
published as Phys. Rev. B 99, 085135 (2019) · 5 pages, 4 figures
arxiv created 2018/07/31 · openalex created_date 2018/08/03 · openalex publication_date 2019/02/25 · arxiv updated 2019/03/06 · openalex updated_date 2026/08/05
The trigonal structure of EuMn2As2 is an anomaly in the tetragonal 122-type pnictide family. We report a detailed investigation of the underlying magnetic correlations in single crystal EuMn2As2 using high-resolution elastic neutron-scattering measurements. The system undergoes two successive antiferromagnetic transitions at T=135\phantom\rule0.16em0exK and 14.4 K, respectively. Numerical modeling of the experimental data reveals the long-range antiferromagnetic correlation of Mn-ions in the a\ensuremath-b plane below TN1=135\phantom\rule0.16em0exK. Mn spins are aligned closer to the diagonal axis of the unit cell. The lower temperature transition, below TN2=14.4\phantom\rule0.16em0exK, is found to arise due to the long-range antiferromagnetic correlation of Eu spins that are rotated by \ensuremathθ=55^\ensuremath∘ from the c axis of the unit cell.