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Title: Magnetic order induces symmetry breaking in the single-crystalline orthorhombic CuMnAs semimetal

Abstract

Recently, orthorhombic CuMnAs has been proposed to be a magnetic material where topological fermions exist around the Fermi level. Here we report the magnetic structure of the orthorhombic Cu0.95MnAs and Cu0.98Mn0.96As single crystals. While Cu0.95MnAs is a commensurate antiferromagnet below 360 K with a propagation vector of k = 0,Cu0.98Mn0.96As undergoes a second-order paramagnetic to incommensurate antiferromagnetic phase transition at 320 K with k = (0.1,0,0), followed by a second-order incommensurate to commensurate antiferromagnetic phase transition at 230 K. In the commensurate antiferromagnetic state, the Mn spins order parallel to the crystallographic b axis but antiparallel to their nearest neighbors, with the spin orientation along the b axis. This magnetic order breaks S2z, the two-fold rotational symmetry around the c axis, resulting in finite band gaps at the crossing point and the disappearance of the massless topological fermions. Furthermore, our first-principles calculations suggest that orthorhombic CuMnAs can still host spin-polarized surface states and signature induced by nontrivial topology, which makes it a promising candidate for antiferromagnetic spintronics.

Authors:
 [1];  [2];  [3];  [4];  [1];  [1];  [1];  [5];  [4];  [1]
+ Show Author Affiliations
  1. Univ. of California, Los Angeles, CA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Stanford Univ., Stanford, CA (United States)
  4. Louisiana State Univ., Baton Rouge, LA (United States)
  5. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1417664
Alternate Identifier(s):
OSTI ID: 1411113
Grant/Contract Number:  
AC02-76SF00515; SC0011978
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 22; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Emmanouilidou, Eve, Cao, Huibo, Tang, Peizhe, Gui, Xin, Hu, Chaowei, Shen, Bing, Wu, Junyi, Zhang, Shou -Cheng, Xie, Weiwei, and Ni, Ni. Magnetic order induces symmetry breaking in the single-crystalline orthorhombic CuMnAs semimetal. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.224405.
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Emmanouilidou, Eve, Cao, Huibo, Tang, Peizhe, Gui, Xin, Hu, Chaowei, Shen, Bing, Wu, Junyi, Zhang, Shou -Cheng, Xie, Weiwei, & Ni, Ni. Magnetic order induces symmetry breaking in the single-crystalline orthorhombic CuMnAs semimetal. United States. https://doi.org/10.1103/PhysRevB.96.224405
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Emmanouilidou, Eve, Cao, Huibo, Tang, Peizhe, Gui, Xin, Hu, Chaowei, Shen, Bing, Wu, Junyi, Zhang, Shou -Cheng, Xie, Weiwei, and Ni, Ni. Mon . "Magnetic order induces symmetry breaking in the single-crystalline orthorhombic CuMnAs semimetal". United States. https://doi.org/10.1103/PhysRevB.96.224405. https://www.osti.gov/servlets/purl/1417664.
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@article{osti_1417664,
title = {Magnetic order induces symmetry breaking in the single-crystalline orthorhombic CuMnAs semimetal},
author = {Emmanouilidou, Eve and Cao, Huibo and Tang, Peizhe and Gui, Xin and Hu, Chaowei and Shen, Bing and Wu, Junyi and Zhang, Shou -Cheng and Xie, Weiwei and Ni, Ni},
abstractNote = {Recently, orthorhombic CuMnAs has been proposed to be a magnetic material where topological fermions exist around the Fermi level. Here we report the magnetic structure of the orthorhombic Cu0.95MnAs and Cu0.98Mn0.96As single crystals. While Cu0.95MnAs is a commensurate antiferromagnet below 360 K with a propagation vector of k = 0,Cu0.98Mn0.96As undergoes a second-order paramagnetic to incommensurate antiferromagnetic phase transition at 320 K with k = (0.1,0,0), followed by a second-order incommensurate to commensurate antiferromagnetic phase transition at 230 K. In the commensurate antiferromagnetic state, the Mn spins order parallel to the crystallographic b axis but antiparallel to their nearest neighbors, with the spin orientation along the b axis. This magnetic order breaks S2z, the two-fold rotational symmetry around the c axis, resulting in finite band gaps at the crossing point and the disappearance of the massless topological fermions. Furthermore, our first-principles calculations suggest that orthorhombic CuMnAs can still host spin-polarized surface states and signature induced by nontrivial topology, which makes it a promising candidate for antiferromagnetic spintronics.},
doi = {10.1103/PhysRevB.96.224405},
journal = {Physical Review B},
number = 22,
volume = 96,
place = {United States},
year = {2017},
month = {12}
}
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https://doi.org/10.1103/PhysRevB.96.224405
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