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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 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.

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.:
Argonne National Lab. (ANL), Argonne, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1524779
Alternate Identifier(s):
OSTI ID: 1479137; OSTI ID: 1486960
Grant/Contract Number:  
AC02-06CH11357; AC05-00OR22725
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, Reig-i-Plessis, Dalmau, Kish, Lasar, Aczel, A. A., Zhang, Biwen, Karapetrova, Evguenia A., MacDougall, Gregory J., and Beekman, Christiane. Spin canting and orbital order in spinel vanadate thin films. United States: N. p., 2018. Web. doi:10.1103/PhysRevMaterials.2.104411.
Thompson, Christie, Reig-i-Plessis, Dalmau, Kish, Lasar, Aczel, A. A., Zhang, Biwen, Karapetrova, Evguenia A., MacDougall, Gregory J., & Beekman, Christiane. Spin canting and orbital order in spinel vanadate thin films. United States. doi:10.1103/PhysRevMaterials.2.104411.
Thompson, Christie, Reig-i-Plessis, Dalmau, Kish, Lasar, Aczel, A. A., Zhang, Biwen, Karapetrova, Evguenia A., MacDougall, Gregory J., and Beekman, Christiane. 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 and Reig-i-Plessis, Dalmau and Kish, Lasar and Aczel, A. A. and Zhang, Biwen and Karapetrova, Evguenia A. and MacDougall, Gregory J. and Beekman, Christiane},
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}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Figure 1 Figure 1: XRD scan of the 00L peaks of a 100 nm thick CoV2O4 film and the SrTiO3 substrate. The film and substrate peaks are indicated with CVO and STO, respectively.

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