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Title: A magnetic topological semimetal Sr 1-yMn 1-zSb2 (y, z < 0.10)

Weyl (WSMs) evolve from Dirac semimetals in the presence of broken time-reversal symmetry (TRS) or space-inversion symmetry. The WSM phases in TaAs-class materials and photonic crystals are due to the loss of space-inversion symmetry. For TRS-breaking WSMs, despite numerous theoretical and experimental efforts, few examples have been reported. Here in this paper, we report a new type of magnetic semimetal Sr 1-yMn 1-zSb 2 (y, z < 0.1) with nearly massless relativistic fermion behaviour (m* = 0.04 - 0.05m 0, where m 0 is the free-electron mass). This material exhibits a ferromagnetic order for 304 K < T < 565 K, but a canted antiferromagnetic order with a ferromagnetic component for T < 304 K. The combination of relativistic fermion behaviour and ferromagnetism in Sr 1-yMn 1-zSb2 offers a rare opportunity to investigate the interplay between relativistic fermions and spontaneous TRS breaking.
Authors:
ORCiD logo [1] ;  [1] ; ORCiD logo [2] ;  [3] ;  [4] ;  [5] ;  [5] ;  [1] ;  [6] ;  [1] ;  [7] ;  [1] ;  [8] ;  [8] ; ORCiD logo [4] ;  [7] ;  [9] ;  [5] ;  [1]
  1. Tulane Univ., New Orleans, LA (United States). Dept. of Physics and Engineering Physics
  2. Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Physics and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Univ. of New Orleans, New Orleans, LA (United States). Advanced Materials Research Inst., Dept. of Physics
  6. Tulane Univ., New Orleans, LA (United States). Dept. of Physics and Engineering Physics; Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Ceramics
  7. Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Physics and Astronomy
  8. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  9. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab); Florida State Univ., Tallahassee, FL (United States). Dept. of Physics
Publication Date:
Report Number(s):
LA-UR-17-30076
Journal ID: ISSN 1476-1122; 103363; TRN: US1702594
Grant/Contract Number:
AC05-00OR22725; SC0012432; NA0001979; DMR-1205469; DMR-1206267; LEQSF(2014-15)-ENH-TR-24; AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Nature Materials
Additional Journal Information:
Journal Volume: 16; Journal Issue: 9; Journal ID: ISSN 1476-1122
Publisher:
Nature Publishing Group
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE; National Science Foundation (NSF); Louisiana Board of Regents
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; High Magnetic Field Science
OSTI Identifier:
1394570
Alternate Identifier(s):
OSTI ID: 1407861