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Title: Spin canting and orbital order in spinel vanadate thin films

Abstract

Here, we report on the epitaxial film growth and characterization of CoV 2O 4, a near-itinerant spinel vanadate, grown on (001) SrTiO 3. The symmetry lowering of the unit cell from cubic in the bulk to orthorhombic in the films results in dramatic differences in the magnetic anisotropy compared to bulk, as determined from structural and magnetic characterization. Bulk cubic CoV 2O 4 has been found to defy predictions by showing orbital degeneracy seemingly lasting to very low temperatures, with only small anomalies in magnetization and neutron experiments signaling a possible spin/orbital glass transition at T = 90 K. In epitaxial thin films presented in this paper, structurally tuning the CoV 2O 4 away from cubic symmetry leads to a completely different low temperature noncollinear ground state. Via magnetization and neutron scattering measurements we show that the 90-K transition is associated with a major spin reorientation away from the ferrimagnetic easy axis [001] to the [110] direction. Furthermore, the V spins cant away from this direction with extracted perpendicular moments providing evidence of a larger canting angle compared to bulk. This result indicates that compressive strain pushes the system deeper into the insulating state, i.e., away from the localized-itinerant crossovermore » regime.« less

Authors:
 [1];  [2];  [2]; ORCiD logo [3];  [1];  [4];  [2];  [1]
  1. Florida State Univ., Tallahassee, FL (United States)
  2. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1524779
Alternate Identifier(s):
OSTI ID: 1479137; OSTI ID: 1486960
Grant/Contract Number:  
AC05-00OR22725; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 2; Journal Issue: 10; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Thompson, Christie J., Reig-i-Plessis, Dalmau, Kish, Lazar, Aczel, Adam A., Zhang, Biwen, Karapetrova, Evguenia, MacDougall, Gregory J., and Beekman, Christianne. Spin canting and orbital order in spinel vanadate thin films. United States: N. p., 2018. Web. doi:10.1103/PhysRevMaterials.2.104411.
Thompson, Christie J., Reig-i-Plessis, Dalmau, Kish, Lazar, Aczel, Adam A., Zhang, Biwen, Karapetrova, Evguenia, MacDougall, Gregory J., & Beekman, Christianne. Spin canting and orbital order in spinel vanadate thin films. United States. doi:10.1103/PhysRevMaterials.2.104411.
Thompson, Christie J., Reig-i-Plessis, Dalmau, Kish, Lazar, Aczel, Adam A., Zhang, Biwen, Karapetrova, Evguenia, MacDougall, Gregory J., and Beekman, Christianne. Thu . "Spin canting and orbital order in spinel vanadate thin films". United States. doi:10.1103/PhysRevMaterials.2.104411. https://www.osti.gov/servlets/purl/1524779.
@article{osti_1524779,
title = {Spin canting and orbital order in spinel vanadate thin films},
author = {Thompson, Christie J. and Reig-i-Plessis, Dalmau and Kish, Lazar and Aczel, Adam A. and Zhang, Biwen and Karapetrova, Evguenia and MacDougall, Gregory J. and Beekman, Christianne},
abstractNote = {Here, we report on the epitaxial film growth and characterization of CoV2O4, a near-itinerant spinel vanadate, grown on (001) SrTiO3. The symmetry lowering of the unit cell from cubic in the bulk to orthorhombic in the films results in dramatic differences in the magnetic anisotropy compared to bulk, as determined from structural and magnetic characterization. Bulk cubic CoV2O4 has been found to defy predictions by showing orbital degeneracy seemingly lasting to very low temperatures, with only small anomalies in magnetization and neutron experiments signaling a possible spin/orbital glass transition at T = 90 K. In epitaxial thin films presented in this paper, structurally tuning the CoV2O4 away from cubic symmetry leads to a completely different low temperature noncollinear ground state. Via magnetization and neutron scattering measurements we show that the 90-K transition is associated with a major spin reorientation away from the ferrimagnetic easy axis [001] to the [110] direction. Furthermore, the V spins cant away from this direction with extracted perpendicular moments providing evidence of a larger canting angle compared to bulk. This result indicates that compressive strain pushes the system deeper into the insulating state, i.e., away from the localized-itinerant crossover regime.},
doi = {10.1103/PhysRevMaterials.2.104411},
journal = {Physical Review Materials},
number = 10,
volume = 2,
place = {United States},
year = {2018},
month = {10}
}