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Title: Effect of anti-site disorder on magnetism in La 2 NiMnO 6

La 2NiMnO 6 has been reported to exhibit a paramagnetic to ferromagnetic transition with a transition temperature of ~ 260 K. However, most of its magnetic properties, such as the saturation magnetization and even the transition temperature, appear to vary considerably among different reports. This is possibly because the crystallographic structure as well as the extent of the anti-site disorder (ASD) at the Ni/Mn sites are strongly influenced by the choice of synthesis routes. There are diverse reports connecting the extent of ASD to the valencies of Ni and Mn ions, such as Ni 2+-Mn 4+ and Ni 3+-Mn 3+, including suggestions of thermally induced valence transitions. Consequently, these reports arrive at very different conclusions on the mechanism behind the magnetic properties of La 2NiMnO 6. To address the correlation between ASD and valency, we have carried out a comparative study of two monoclinic La 2NiMnO 6 polycrystals with different degrees of ASD. Using a combination of x-ray absorption spectroscopy, x-raymagnetic circular dichroism, andmagnetometry, we conclude that the valency of the transition metal ions, and the transition temperature, are insensitive to the extent of ASD. Furthermore, we find the magnetic moment decreases strongly with an increasing ASD. We attribute thismore » effect to the introduction of antiferromagnetic interactions in the anti-site disordered regions.« less
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [3] ;  [4] ;  [5]
  1. Indian Institute of Science, Bengaluru (India)
  2. Jawaharlal Nehru Centre for Advanced Scientific Research, Bengaluru (India)
  3. Uppsala Univ., Uppsala (Sweden)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Indian Institute of Science, Bengaluru (India); Jawaharlal Nehru Centre for Advanced Scientific Research, Bengaluru (India)
Publication Date:
Grant/Contract Number:
AC02-06CH11357; DEAC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 16; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1461489
Alternate Identifier(s):
OSTI ID: 1434570

Pal, Somnath, Govinda, Sharada, Goyal, Manik, Mukherjee, Soham, Pal, Banabir, Saha, Rana, Sundaresan, A., Jana, Somnath, Karis, Olof, Freeland, John W., and Sarma, D. D.. Effect of anti-site disorder on magnetism in La2NiMnO6. United States: N. p., Web. doi:10.1103/PhysRevB.97.165137.
Pal, Somnath, Govinda, Sharada, Goyal, Manik, Mukherjee, Soham, Pal, Banabir, Saha, Rana, Sundaresan, A., Jana, Somnath, Karis, Olof, Freeland, John W., & Sarma, D. D.. Effect of anti-site disorder on magnetism in La2NiMnO6. United States. doi:10.1103/PhysRevB.97.165137.
Pal, Somnath, Govinda, Sharada, Goyal, Manik, Mukherjee, Soham, Pal, Banabir, Saha, Rana, Sundaresan, A., Jana, Somnath, Karis, Olof, Freeland, John W., and Sarma, D. D.. 2018. "Effect of anti-site disorder on magnetism in La2NiMnO6". United States. doi:10.1103/PhysRevB.97.165137.
@article{osti_1461489,
title = {Effect of anti-site disorder on magnetism in La2NiMnO6},
author = {Pal, Somnath and Govinda, Sharada and Goyal, Manik and Mukherjee, Soham and Pal, Banabir and Saha, Rana and Sundaresan, A. and Jana, Somnath and Karis, Olof and Freeland, John W. and Sarma, D. D.},
abstractNote = {La2NiMnO6 has been reported to exhibit a paramagnetic to ferromagnetic transition with a transition temperature of ~ 260 K. However, most of its magnetic properties, such as the saturation magnetization and even the transition temperature, appear to vary considerably among different reports. This is possibly because the crystallographic structure as well as the extent of the anti-site disorder (ASD) at the Ni/Mn sites are strongly influenced by the choice of synthesis routes. There are diverse reports connecting the extent of ASD to the valencies of Ni and Mn ions, such as Ni2+-Mn4+ and Ni3+-Mn3+, including suggestions of thermally induced valence transitions. Consequently, these reports arrive at very different conclusions on the mechanism behind the magnetic properties of La2NiMnO6. To address the correlation between ASD and valency, we have carried out a comparative study of two monoclinic La2NiMnO6 polycrystals with different degrees of ASD. Using a combination of x-ray absorption spectroscopy, x-raymagnetic circular dichroism, andmagnetometry, we conclude that the valency of the transition metal ions, and the transition temperature, are insensitive to the extent of ASD. Furthermore, we find the magnetic moment decreases strongly with an increasing ASD. We attribute this effect to the introduction of antiferromagnetic interactions in the anti-site disordered regions.},
doi = {10.1103/PhysRevB.97.165137},
journal = {Physical Review B},
number = 16,
volume = 97,
place = {United States},
year = {2018},
month = {4}
}