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

Abstract

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.

Authors:

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

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+ Show Author Affiliations

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

Publication Date:

Mon Feb 25 00:00:00 EST 2019

Research Org.:

Univ. of Missouri, Columbia, MO (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:

1594103

Alternate Identifier(s):

OSTI ID: 1496499

Grant/Contract Number:  

SC0014461

Resource Type:

Accepted Manuscript

Journal Name:

Physical Review B

Additional Journal Information:

Journal Volume: 99; Journal Issue: 8; Journal ID: ISSN 2469-9950

Publisher:

American Physical Society (APS)

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE