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Title: Spin order and dynamics in the diamond-lattice Heisenberg antiferromagnets CuRh 2 O 4 and CoRh 2 O 4

Abstract

Here, antiferromagnetic insulators on a diamond lattice are candidate materials to host exotic magnetic phenomena ranging from spin-orbital entanglement to degenerate spiral ground states and topological paramagnetism. Compared to other three-dimensional networks of magnetic ions, such as the geometrically frustrated pyrochlore lattice, the investigation of diamond-lattice magnetism in real materials is less mature. In this work, we characterize the magnetic properties of model A-site spinels CoRh 2O 4 (cobalt rhodite) and CuRh 2O 4 (copper rhodite) by means of thermomagnetic and neutron-scattering measurements, and we perform group theory analysis, Rietveld refinement, mean-field theory, and spin-wave theory calculations to analyze the experimental results. Our investigation reveals that cubic CoRh 2O 4 is a canonical S = 3/2 diamond-lattice Heisenberg antiferromagnet with a nearest-neighbor exchange J = 0.63 meV and a Néel ordered ground state below a temperature of 25 K. In tetragonally distorted CuRh 2O 4, competing exchange interactions between up to third-nearest-neighbor spins lead to the development of an incommensurate spin helix at 24 K with a magnetic propagation vector k m = (0,0,0.79). Strong reduction of the ordered moment is observed for the S = 1/2 spins in CuRh 2O 4 and captured by our 1/ S corrections tomore » the staggered magnetization. Our work identifies CoRh 2O 4 and CuRh 2O 4 as reference materials to guide future work searching for exotic quantum behavior in diamond-lattice antiferromagnets.« less

Authors:
 [1];  [2];  [3]; ORCiD logo [4]; ORCiD logo [4];  [2];  [5]; ORCiD logo [1]
  1. Georgia Inst. of Technology, Atlanta, GA (United States)
  2. Oregon State Univ., Corvallis, OR (United States)
  3. Georgia Inst. of Technology, Atlanta, GA (United States); Univ. of Cambridge, Cambridge (United Kingdom)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Univ. of California, Santa Cruz, CA (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:
1471939
Alternate Identifier(s):
OSTI ID: 1374655
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 6; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Ge, L., Flynn, J., Paddison, Joseph A. M., Stone, Matthew B., Calder, Stuart A., Subramanian, M. A., Ramirez, A. P., and Mourigal, Martin P. Spin order and dynamics in the diamond-lattice Heisenberg antiferromagnets CuRh2O4 and CoRh2O4. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.064413.
Ge, L., Flynn, J., Paddison, Joseph A. M., Stone, Matthew B., Calder, Stuart A., Subramanian, M. A., Ramirez, A. P., & Mourigal, Martin P. Spin order and dynamics in the diamond-lattice Heisenberg antiferromagnets CuRh2O4 and CoRh2O4. United States. doi:10.1103/PhysRevB.96.064413.
Ge, L., Flynn, J., Paddison, Joseph A. M., Stone, Matthew B., Calder, Stuart A., Subramanian, M. A., Ramirez, A. P., and Mourigal, Martin P. Wed . "Spin order and dynamics in the diamond-lattice Heisenberg antiferromagnets CuRh2O4 and CoRh2O4". United States. doi:10.1103/PhysRevB.96.064413. https://www.osti.gov/servlets/purl/1471939.
@article{osti_1471939,
title = {Spin order and dynamics in the diamond-lattice Heisenberg antiferromagnets CuRh2O4 and CoRh2O4},
author = {Ge, L. and Flynn, J. and Paddison, Joseph A. M. and Stone, Matthew B. and Calder, Stuart A. and Subramanian, M. A. and Ramirez, A. P. and Mourigal, Martin P.},
abstractNote = {Here, antiferromagnetic insulators on a diamond lattice are candidate materials to host exotic magnetic phenomena ranging from spin-orbital entanglement to degenerate spiral ground states and topological paramagnetism. Compared to other three-dimensional networks of magnetic ions, such as the geometrically frustrated pyrochlore lattice, the investigation of diamond-lattice magnetism in real materials is less mature. In this work, we characterize the magnetic properties of model A-site spinels CoRh2O4 (cobalt rhodite) and CuRh2O4 (copper rhodite) by means of thermomagnetic and neutron-scattering measurements, and we perform group theory analysis, Rietveld refinement, mean-field theory, and spin-wave theory calculations to analyze the experimental results. Our investigation reveals that cubic CoRh2O4 is a canonical S = 3/2 diamond-lattice Heisenberg antiferromagnet with a nearest-neighbor exchange J = 0.63 meV and a Néel ordered ground state below a temperature of 25 K. In tetragonally distorted CuRh2O4, competing exchange interactions between up to third-nearest-neighbor spins lead to the development of an incommensurate spin helix at 24 K with a magnetic propagation vector km = (0,0,0.79). Strong reduction of the ordered moment is observed for the S = 1/2 spins in CuRh2O4 and captured by our 1/S corrections to the staggered magnetization. Our work identifies CoRh2O4 and CuRh2O4 as reference materials to guide future work searching for exotic quantum behavior in diamond-lattice antiferromagnets.},
doi = {10.1103/PhysRevB.96.064413},
journal = {Physical Review B},
issn = {2469-9950},
number = 6,
volume = 96,
place = {United States},
year = {2017},
month = {8}
}

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    Works referencing / citing this record:

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