Magnetic ground state of the two isostructual polymeric quantum magnets [Cu(HF2)(pyrazine)2]SbF6 and [Co(HF2)(pyrazine)2]SbF6 investigated with neutron powder diffraction

Brambleby, J.; Goddard, P. A.; Johnson, R. D.; Liu, J.; Kaminski, D.; Ardavan, A.; Steele, A. J.; Blundell, S. J.; Lancaster, T.; Manuel, P.; Baker, P. J.; Singleton, J.; Schwalbe, S. G.; Spurgeon, P. M.; Tran, H. E.; Peterson, P. K.; Corbey, J. F.; Manson, J. L.

doi:10.1103/PhysRevB.92.134406

Title: Magnetic ground state of the two isostructual polymeric quantum magnets $[Cu ({HF}_{2}) (pyrazine)_{2}] {SbF}_{6}$ and $[Co ({HF}_{2}) (pyrazine)_{2}] {SbF}_{6}$ investigated with neutron powder diffraction

Journal Article · Wed Oct 07 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.134406· OSTI ID:1334127

Brambleby, J. ^[1]; Goddard, P. A. ^[1]; Johnson, R. D. ^[2]; Liu, J. ^[3]; Kaminski, D. ^[2]; Ardavan, A. ^[2]; Steele, A. J. ^[2]; Blundell, S. J. ^[2]; Lancaster, T. ^[4]; Manuel, P. ^[5]; Baker, P. J. ^[5]; Singleton, J. ^[6]; Schwalbe, S. G. ^[7]; Spurgeon, P. M. ^[7]; Tran, H. E. ^[7]; Peterson, P. K. ^[7]; Corbey, J. F. ^[7]; Manson, J. L. ^[7]

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)μ_b, while the ordered moments for the Co(II) ions in [Co(HF₂)(pyrazine)₂]SbF₆ are 3.02(6)μ_b. 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.

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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

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Cited by: 11 works

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Synthesis and characterization of a new quasi-one-dimensional antiferromagnet CoF2(H2O)2(pyrazine) Wang, Yanhong; Liu, Hang; Fu, Peng Science China Materials, Vol. 62, Issue 12 https://doi.org/10.1007/s40843-019-1198-3	journal	October 2019
Implications of bond disorder in a S=1 kagome lattice Manson, Jamie L.; Brambleby, Jamie; Goddard, Paul A. Scientific Reports, Vol. 8, Issue 1 https://doi.org/10.1038/s41598-018-23054-6	journal	March 2018

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Title: Magnetic ground state of the two isostructual polymeric quantum magnets [ Cu ( HF 2 ) ( pyrazine ) 2 ] SbF 6 and [ Co ( HF 2 ) ( pyrazine ) 2 ] SbF 6 investigated with neutron powder diffraction

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Title: Magnetic ground state of the two isostructual polymeric quantum magnets $[Cu ({HF}_{2}) (pyrazine)_{2}] {SbF}_{6}$ and $[Co ({HF}_{2}) (pyrazine)_{2}] {SbF}_{6}$ investigated with neutron powder diffraction