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Title: Evolution of magnetic and orbital properties in the magnetically diluted A -site spinel Cu 1 x Zn x Rh 2 O 4

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, CuRh 2O 4, with nonmagnetic Zn 2+ 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 x spin ~0.44. Interestingly, this critical doping is demonstrably distinct from a second structural critical point at x JT ~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 x spin 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:
 [1] ;  [1] ;  [1] ; ORCiD logo [2] ; ORCiD logo [2] ; ORCiD logo [2]
  1. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
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)
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:
1484133
Alternate Identifier(s):
OSTI ID: 1441121

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., 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. doi:10.1103/PhysRevB.97.214411.
Zakrzewski, A. V., Gangopadhyay, S., MacDougall, Gregory J., Aczel, Adam A., Calder, Stuart A., and Williams, Travis J.. 2018. "Evolution of magnetic and orbital properties in the magnetically diluted A-site spinel Cu1–xZnxRh2O4". United States. doi:10.1103/PhysRevB.97.214411.
@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 = {2018},
month = {6}
}