Magnetic ground state of the two isostructual polymeric quantum magnets and investigated with neutron powder diffraction
- Univ. of Warwick, Coventry (United Kingdom). Dept. of Physics
- Univ. of Oxford (United Kingdom). Dept. of Physics
- Univ. of Oxford (United Kingdom). Dept. of Materials
- Durham Univ. (United Kingdom). ISIS Pulsed Neutron and Muon Facility
- ISIS Pulsed Neutron and Muon Facility, Oxfordshire (United Kingdom)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States). National High Magnetic Field Lab.
- Eastern Washington Univ., Cheney, WA (United States). Dept. of Chemistry and Biochemistry
The magnetic ground state of two isostructural coordination polymers, (i) the quasi-two-dimensional S=1/2 square-lattice antiferromagnet [Cu(HF2)(pyrazine)2]SbF6 and (ii) a related compound [Co(HF2)(pyrazine)2]SbF6, was examined with neutron powder diffraction measurements. We find that the ordered moments of the Heisenberg S=1/2 Cu(II) ions in [Cu(HF2)(pyrazine)2]SbF6 are 0.6(1)μb, while the ordered moments for the Co(II) ions in [Co(HF2)(pyrazine)2]SbF6 are 3.02(6)μb. For Cu(II), this reduced moment indicates the presence of quantum fluctuations below the ordering temperature. We also show from heat capacity and electron spin resonance measurements that due to the crystal electric field splitting of the S=3/2 Co(II) ions in [Co(HF2)(pyrazine)2]SbF6, this isostructual polymer also behaves as an effective spin-half magnet at low temperatures. Furthermore, the Co moments in [Co(HF2)(pyrazine)2]SbF6 show strong easy-axis anisotropy, neutron diffraction data, which do not support the presence of quantum fluctuations in the ground state, and heat capacity data, which are consistent with 2D or close to 3D spatial exchange anisotropy.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1334127
- Alternate ID(s):
- OSTI ID: 1223128
- Report Number(s):
- LA-UR-15-27163; PRBMDO
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 13; ISSN 1098-0121
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Synthesis and characterization of a new quasi-one-dimensional antiferromagnet CoF2(H2O)2(pyrazine)
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journal | October 2019 |
Implications of bond disorder in a S=1 kagome lattice
|
journal | March 2018 |
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