Spin correlation in trigonal EuMn2As2

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 antife...

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Bibliographic Details
Published in:Physical review. B 2019-02, Vol.99 (8), p.085135
Main Authors: Dahal, A, Chen, Yiyao, Heitmann, T, Thamizhavel, A, Paramanik, U, Dhar, S K, Singh, D K
Format: Article
Language:English
Subjects:
Antiferromagnetism
Elastic scattering
Group 5A compounds
MATERIALS SCIENCE
Mathematical models
Single crystals
Unit cell
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Summary: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=135K and 14.4 K, respectively. Numerical modeling of the experimental data reveals the long-range antiferromagnetic correlation of Mn-ions in the a−b plane below TN1=135K. Mn spins are aligned closer to the diagonal axis of the unit cell. The lower temperature transition, below TN2=14.4K, is found to arise due to the long-range antiferromagnetic correlation of Eu spins that are rotated by θ=55∘ from the c axis of the unit cell.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.99.085135