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

Abstract

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.

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:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1440814
Alternate Identifier(s):
OSTI ID: 1416624
Grant/Contract Number:  
AC05-00OR22725; SC0016315; SC0012432
Resource 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)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

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., 2018. 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. https://doi.org/10.1103/PhysRevB.97.024410
Nepal, Roshan, Zhang, Qiang, Dai, Samuel, Tian, Wei, Nagler, Stephen E., and Jin, Rongying. Thu . "Structural and magnetic transitions in spinel FeMn2O4 single crystals". United States. https://doi.org/10.1103/PhysRevB.97.024410. https://www.osti.gov/servlets/purl/1440814.
@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 = {Thu Jan 11 00:00:00 EST 2018},
month = {Thu Jan 11 00:00:00 EST 2018}
}

Journal Article:

Citation Metrics:
Cited by: 25 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) Crystal structure of FeMn2O4; (b) Powder x-ray diffraction pattern at room temperature with all peaks indexed in the I41/amd tetragonal symmetry. Inset: an as-grown single crystal with the growth direction indicated by an arrow; (c) (440)C and (404)C nuclear peaks indexed in pseudocubic notation at indicated temperaturesmore » via neutron powder diffraction measurements. The peak indicated by * is the aluminum (220) peak from the Al sample holder; (d) Temperature dependence of the integrated intensity of (404)C nuclear peak. Inset: the derivative of the (404)C peak intensity for Ts determination.« less

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.