Spin correlation in trigonal ${\mathrm{EuMn}}_2{\mathrm{As}}_2$

Journal Article · 24 February 2019 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.99.085135 · OSTI ID:1594103

Dahal, A. ^[1]; Chen, Yiyao ^[2]; Heitmann, T. ^[2]; Thamizhavel, A. ^[3]; Paramanik, U. ^[4]; Dhar, S. K. ^[3]; Singh, D. K. ^[2]

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1. Univ. of Missouri, Columbia, MO (United States); UNIVERSITY OF MISSOURI, COLUMBIA
2. Univ. of Missouri, Columbia, MO (United States)
3. Tata Inst. of Fundamental Research, Mumbai (India)
4. Tata Inst. of Fundamental Research, Mumbai (India); Univ. of Calcutta, Kolkata (India)

The trigonal structure of ${\mathrm{EuMn}}_2{\mathrm{As}}_2$ is an anomaly in the tetragonal 122-type pnictide family. Here, we report a detailed investigation of the underlying magnetic correlations in single crystal ${\mathrm{EuMn}}_2{\mathrm{As}}_2$ using high-resolution elastic neutron-scattering measurements. The system undergoes two successive antiferromagnetic transitions at $T=135\mathrm{K}$ 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 $T_{N1}=135\mathrm{K}$. Mn spins are aligned closer to the diagonal axis of the unit cell. The lower temperature transition, below $T_{N2}=14.4\mathrm{K}$, is discovered to arise due to the long-range antiferromagnetic correlation of Eu spins that are rotated by $\theta ={55}^{°}$ from the $c$ axis of the unit cell.

• Research Organization: Univ. of Missouri, Columbia, MO (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
• Grant/Contract Number: SC0014461
• OSTI ID: 1594103
• Journal Information: Physical Review B, Journal Name: Physical Review B Journal Issue: 8 Vol. 99; ISSN 2469-9950; ISSN PRBMDO
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English