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Title: Structural and magnetic transitions in spinel FeM n 2 O 4 single crystals

Materials that form the spinel structure are known to exhibit geometric frustration, which can lead to magnetic frustration as well. Through magnetization and neutron diffraction measurements, we find that FeMn 2O 4 undergoes one structural and two magnetic transitions. The structural transition occurs at T s ~595K from cubic at high temperatures to tetragonal at low temperatures. Here, two magnetic transitions are ferrimagnetic at T FI–1 ~373K and T FI–2 ~50K, respectively. Further investigation of the specific heat, thermal conductivity, and Seebeck coefficient confirms both magnetic transitions. Of particular interest is that there is a significant magnetic contribution to the low-temperature specific heat and thermal conductivity, providing a unique system to study heat transport by magnetic excitations.
Authors:
 [1] ;  [1] ;  [1] ; ORCiD logo [2] ; ORCiD logo [2] ;  [1]
  1. Louisiana State Univ., Baton Rouge, LA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; SC0016315; SC0012432
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 2; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (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:
1440814
Alternate Identifier(s):
OSTI ID: 1416624

Nepal, Roshan, Zhang, Qiang, Dai, Samuel, Tian, Wei, Nagler, Stephen E., and Jin, Rongying. Structural and magnetic transitions in spinel FeMn2O4 single crystals. United States: N. p., Web. doi:10.1103/PhysRevB.97.024410.
Nepal, Roshan, Zhang, Qiang, Dai, Samuel, Tian, Wei, Nagler, Stephen E., & Jin, Rongying. Structural and magnetic transitions in spinel FeMn2O4 single crystals. United States. doi:10.1103/PhysRevB.97.024410.
Nepal, Roshan, Zhang, Qiang, Dai, Samuel, Tian, Wei, Nagler, Stephen E., and Jin, Rongying. 2018. "Structural and magnetic transitions in spinel FeMn2O4 single crystals". United States. doi:10.1103/PhysRevB.97.024410.
@article{osti_1440814,
title = {Structural and magnetic transitions in spinel FeMn2O4 single crystals},
author = {Nepal, Roshan and Zhang, Qiang and Dai, Samuel and Tian, Wei and Nagler, Stephen E. and Jin, Rongying},
abstractNote = {Materials that form the spinel structure are known to exhibit geometric frustration, which can lead to magnetic frustration as well. Through magnetization and neutron diffraction measurements, we find that FeMn2O4 undergoes one structural and two magnetic transitions. The structural transition occurs at Ts ~595K from cubic at high temperatures to tetragonal at low temperatures. Here, two magnetic transitions are ferrimagnetic at TFI–1 ~373K and TFI–2 ~50K, respectively. Further investigation of the specific heat, thermal conductivity, and Seebeck coefficient confirms both magnetic transitions. Of particular interest is that there is a significant magnetic contribution to the low-temperature specific heat and thermal conductivity, providing a unique system to study heat transport by magnetic excitations.},
doi = {10.1103/PhysRevB.97.024410},
journal = {Physical Review B},
number = 2,
volume = 97,
place = {United States},
year = {2018},
month = {1}
}

Works referenced in this record:

Cooperative Jahn–Teller effect and the role of strain in the tetragonal-to-cubic phase transition in MgxCu1 − xCr2O4
journal, August 2016
  • Tarantino, Serena C.; Giannini, Mattia; Carpenter, Michael A.
  • IUCrJ, Vol. 3, Issue 5, p. 354-366
  • DOI: 10.1107/S2052252516012574