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Structure and magnetic properties of LnMnSbO ( Ln=La and Ce)

Journal Article · · Physical Review B
 [1];  [2];  [2];  [3];  [1];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Ames Lab., Ames, IA (United States)
Here, a neutron powder diffraction (NPD) study of LnMnSbO (Ln = La or Ce) reveals differences between the magnetic ground state of the two compounds due to the strong Ce-Mn coupling compared to La-Mn. The two compounds adopt the P4/nmm space group down to 2 K, and whereas magnetization measurements do not show obvious anomaly at high temperatures, NPD reveals a C-type antiferromagnetic (AFM) order below TN = 255K for LaMnSbO and 240 K for CeMnSbO. While the magnetic structure of LaMnSbO is preserved to base temperature, a sharp transition at TSR = 4.5K is observed in CeMnSbO due to a spin-reorientation (SR) transition of the Mn2+ magnetic moments from pointing along the c axis to the ab plane. The SR transition in CeMnSbO is accompanied by a simultaneous long-range AFM ordering of the Ce moments, which indicates that the Mn SR transition is driven by the Ce-Mn coupling. The ordered moments are found to be somewhat smaller than those expected for Mn2+ (S = 5/2) in insulators, but large enough to suggest that these compounds belong to the class of local-moment antiferromagnets. The lower TN found in these two compounds compared to the As-based counterparts (TN = 317 for LaMnAsO, TN = 347K for CeMnAsO) indicates that the Mn-Pn (Pn=As or Sb) hybridization that mediates the superexchange Mn-Pn-Mn coupling is weaker for the Sb-based compounds.
Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1254302
Alternate ID(s):
OSTI ID: 1242583
Report Number(s):
IS-J--8988
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 9 Vol. 93; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Hole doping and antiferromagnetic correlations above the Néel temperature of the topological semimetal ( Sr 1 − x K x ) MnSb 2 journal July 2019
Influence of magnetism on Dirac semimetallic behavior in nonstoichiometric Sr 1 − y Mn 1 − z Sb 2 ( y ∼ 0.07 , z ∼ 0.02 ) journal November 2019
Symmetry analysis of current-induced switching of antiferromagnets journal December 2018
Group-theoretical classification of multipole order: Emergent responses and candidate materials journal December 2018
Crystal growth, microstructure, and physical properties of SrMnSb 2 journal February 2019

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