Evolution of magnetic and orbital properties in the magnetically diluted -site spinel
Abstract
In frustrated spinel antiferromagnets, dilution with nonmagnetic ions can be a powerful strategy for probing unconventional spin states or uncovering interesting phenomena. Here, we present x-ray, neutron scattering, and thermodynamic studies of the effects of magnetic dilution of the tetragonally distorted A-site spinel antiferromagnet, CuRh2O4, with nonmagnetic Zn2+ ions. Our data confirm the helical spin order recently identified at low temperatures in this material, and further demonstrate a systematic suppression of the associated Néel temperature with increasing site dilution towards a continuous transition with critical doping of xspin ~0.44. Interestingly, this critical doping is demonstrably distinct from a second structural critical point at xJT ~0.6, which is consistent with the suppression of orbital order on the A site through a classical percolative mechanism. In conclusion, this anomalously low value for xspin is confirmed via multiple measurements, and is inconsistent with predictions of classical percolation theory, suggesting that the spin transition in this material is driven by an enhancement of preexisting spin fluctuations with weak dilution.
- Authors:
-
- Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1484133
- Alternate Identifier(s):
- OSTI ID: 1441121
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 97; Journal Issue: 21; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Zakrzewski, A. V., Gangopadhyay, S., MacDougall, Gregory J., Aczel, Adam A., Calder, Stuart A., and Williams, Travis J. Evolution of magnetic and orbital properties in the magnetically diluted A-site spinel Cu1–xZnxRh2O4. United States: N. p., 2018.
Web. doi:10.1103/PhysRevB.97.214411.
Zakrzewski, A. V., Gangopadhyay, S., MacDougall, Gregory J., Aczel, Adam A., Calder, Stuart A., & Williams, Travis J. Evolution of magnetic and orbital properties in the magnetically diluted A-site spinel Cu1–xZnxRh2O4. United States. https://doi.org/10.1103/PhysRevB.97.214411
Zakrzewski, A. V., Gangopadhyay, S., MacDougall, Gregory J., Aczel, Adam A., Calder, Stuart A., and Williams, Travis J. Mon .
"Evolution of magnetic and orbital properties in the magnetically diluted A-site spinel Cu1–xZnxRh2O4". United States. https://doi.org/10.1103/PhysRevB.97.214411. https://www.osti.gov/servlets/purl/1484133.
@article{osti_1484133,
title = {Evolution of magnetic and orbital properties in the magnetically diluted A-site spinel Cu1–xZnxRh2O4},
author = {Zakrzewski, A. V. and Gangopadhyay, S. and MacDougall, Gregory J. and Aczel, Adam A. and Calder, Stuart A. and Williams, Travis J.},
abstractNote = {In frustrated spinel antiferromagnets, dilution with nonmagnetic ions can be a powerful strategy for probing unconventional spin states or uncovering interesting phenomena. Here, we present x-ray, neutron scattering, and thermodynamic studies of the effects of magnetic dilution of the tetragonally distorted A-site spinel antiferromagnet, CuRh2O4, with nonmagnetic Zn2+ ions. Our data confirm the helical spin order recently identified at low temperatures in this material, and further demonstrate a systematic suppression of the associated Néel temperature with increasing site dilution towards a continuous transition with critical doping of xspin ~0.44. Interestingly, this critical doping is demonstrably distinct from a second structural critical point at xJT ~0.6, which is consistent with the suppression of orbital order on the A site through a classical percolative mechanism. In conclusion, this anomalously low value for xspin is confirmed via multiple measurements, and is inconsistent with predictions of classical percolation theory, suggesting that the spin transition in this material is driven by an enhancement of preexisting spin fluctuations with weak dilution.},
doi = {10.1103/PhysRevB.97.214411},
journal = {Physical Review B},
number = 21,
volume = 97,
place = {United States},
year = {Mon Jun 11 00:00:00 EDT 2018},
month = {Mon Jun 11 00:00:00 EDT 2018}
}
Web of Science
Figures / Tables:
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