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Title: Spin-lattice and spin-electronic interactions in the van der Waals semiconductor C⁢o2⁢P2⁢S6

Journal Article · · Physical Review. B
ORCiD logo [1];  [2];  [2]; ORCiD logo [3]; ORCiD logo [4];  [5]; ORCiD logo [1]
  1. Victoria Univ. of Wellington (New Zealand)
  2. Victoria Univ. of Wellington (New Zealand); MacDiarmid Institute for Advanced Materials and Nanotechnology (New Zealand)
  3. Air Force Research Lab. (AFRL), Wright-Patterson AFB, OH (United States); National Research Council, Washington, DC (United States)
  4. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  5. Air Force Research Lab. (AFRL), Wright-Patterson AFB, OH (United States)

Here, we report the results of a temperature-dependent reflection spectroscopy study, across a wide energy range (~ 0.01 to 3 eV), of unsubstituted and 40% Zn substituted for Co, for the transition-metal phosphorus trichalcogenide, C⁢o2⁢P2⁢S6. We observe a transition from a paramagnetic to antiferromagnetic state with a Néel temperature at TN ~ 120 K that is completely suppressed in Zn-substituted samples. At 300 K we identify four narrow (~ 1 meV) infrared active phonon modes while at 70 K (below TN) we observe that the low-energy phonons, dominated by Co motion, resolve into two modes. These low-energy modes are asymmetric, indicating coupling to a broad electronic continuum. We also report a broad (~ 30 meV) low-temperature infrared absorption band that appears near TN that we suggest is determined by a multiphonon-assisted 2-magnon absorption process. At 300 K in higher-energy spectra, we observe considerable absorption starting from 0.20 ± 0.02 eV which we associate with inter-C⁢o2+ ion 3⁢d transitions. At temperatures below TN the number of electronic absorption bands increases from 4 to 6, indicating a lowering of the symmetry around the C⁢o2+ ions. On substituting 40% Zn for Co, the antiferromagnetic transition is suppressed along with temperature-dependent changes in the phonon and electronic spectra. The temperature-dependent spectral changes indicate strongly correlated behavior between the infrared active lattice vibrations, the electronic excitations, and magnetism in unsubstituted C⁢o2⁢P2⁢S6.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2428039
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 16 Vol. 109; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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