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

Journal Article · · Physical Review B
 [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)

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.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1471939
Alternate ID(s):
OSTI ID: 1374655
Journal Information:
Physical Review B, Vol. 96, Issue 6; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

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Cited By (4)

Diamond lattice Heisenberg antiferromagnet journal March 2018
Spin-orbital entanglement in d 8 Mott insulators: Possible excitonic magnetism in diamond lattice antiferromagnets journal July 2019
Two-Dimensional Topological Superconductivity with Antiferromagnetic Insulators journal July 2018
Low-dimensional quantum magnetism in Cu(NCS)2: A molecular framework material text January 2018