Magnetic ground state of the one-dimensional ferromagnetic chain compounds M(NCS)(2)(thiourea)(2) (M = Ni, Co)
The magnetic properties of the two isostructural molecule-based magnets - Ni(NCS)2(thiourea)2, S=1 [thiourea=SC(NH2)2] and Co(NCS)2(thiourea)2, S=3/2 - are characterized using several techniques in order to rationalize their relationship with structural parameters and to ascertain magnetic changes c...
| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
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American Physical Society
2021
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| _version_ | 1826278097092083712 |
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| author | Curley, SPM Scatena, R Williams, RC Goddard, PA Macchi, P Hicken, TJ Lancaster, T Xiao, F Blundell, SJ Zapf, V Eckert, JC Krenkel, EH Villa, JA Rhodehouse, ML Manson, JL |
| author_facet | Curley, SPM Scatena, R Williams, RC Goddard, PA Macchi, P Hicken, TJ Lancaster, T Xiao, F Blundell, SJ Zapf, V Eckert, JC Krenkel, EH Villa, JA Rhodehouse, ML Manson, JL |
| author_sort | Curley, SPM |
| collection | OXFORD |
| description | The magnetic properties of the two isostructural molecule-based magnets - Ni(NCS)2(thiourea)2, S=1 [thiourea=SC(NH2)2] and Co(NCS)2(thiourea)2, S=3/2 - are characterized using several techniques in order to rationalize their relationship with structural parameters and to ascertain magnetic changes caused by substitution of the spin. Zero-field heat capacity and muon-spin relaxation measurements reveal low-temperature long-range ordering in both compounds, in addition to Ising-like (D<0) single-ion anisotropy (DCo∼-100 K, DNi∼-10 K). Crystal and electronic structure, combined with dc-field magnetometry, affirm highly quasi-one-dimensional behavior, with ferromagnetic intrachain exchange interactions JCo≈+4 K and JNi∼+100 K and weak antiferromagnetic interchain exchange, on the order of J′∼-0.1 K. Electron charge- and spin-density mapping reveals through-space exchange as a mechanism to explain the large discrepancy in J-values despite, from a structural perspective, the highly similar exchange pathways in both materials. Both species can be compared to the similar compounds MCl2(thiourea)4, M = Ni(II) (DTN) and Co(II) (DTC), where DTN is known to harbor two magnetic-field-induced quantum critical points. Direct comparison of DTN and DTC with the compounds studied here shows that substituting the halide Cl- ion for the NCS- ion results in a dramatic change in both the structural and magnetic properties. |
| first_indexed | 2024-03-06T23:38:51Z |
| format | Journal article |
| id | oxford-uuid:6e99f717-73cf-4cbb-aac4-f8a56f04ccbf |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T23:38:51Z |
| publishDate | 2021 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:6e99f717-73cf-4cbb-aac4-f8a56f04ccbf2022-03-26T19:25:32ZMagnetic ground state of the one-dimensional ferromagnetic chain compounds M(NCS)(2)(thiourea)(2) (M = Ni, Co)Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:6e99f717-73cf-4cbb-aac4-f8a56f04ccbfEnglishSymplectic ElementsAmerican Physical Society2021Curley, SPMScatena, RWilliams, RCGoddard, PAMacchi, PHicken, TJLancaster, TXiao, FBlundell, SJZapf, VEckert, JCKrenkel, EHVilla, JARhodehouse, MLManson, JLThe magnetic properties of the two isostructural molecule-based magnets - Ni(NCS)2(thiourea)2, S=1 [thiourea=SC(NH2)2] and Co(NCS)2(thiourea)2, S=3/2 - are characterized using several techniques in order to rationalize their relationship with structural parameters and to ascertain magnetic changes caused by substitution of the spin. Zero-field heat capacity and muon-spin relaxation measurements reveal low-temperature long-range ordering in both compounds, in addition to Ising-like (D<0) single-ion anisotropy (DCo∼-100 K, DNi∼-10 K). Crystal and electronic structure, combined with dc-field magnetometry, affirm highly quasi-one-dimensional behavior, with ferromagnetic intrachain exchange interactions JCo≈+4 K and JNi∼+100 K and weak antiferromagnetic interchain exchange, on the order of J′∼-0.1 K. Electron charge- and spin-density mapping reveals through-space exchange as a mechanism to explain the large discrepancy in J-values despite, from a structural perspective, the highly similar exchange pathways in both materials. Both species can be compared to the similar compounds MCl2(thiourea)4, M = Ni(II) (DTN) and Co(II) (DTC), where DTN is known to harbor two magnetic-field-induced quantum critical points. Direct comparison of DTN and DTC with the compounds studied here shows that substituting the halide Cl- ion for the NCS- ion results in a dramatic change in both the structural and magnetic properties. |
| spellingShingle | Curley, SPM Scatena, R Williams, RC Goddard, PA Macchi, P Hicken, TJ Lancaster, T Xiao, F Blundell, SJ Zapf, V Eckert, JC Krenkel, EH Villa, JA Rhodehouse, ML Manson, JL Magnetic ground state of the one-dimensional ferromagnetic chain compounds M(NCS)(2)(thiourea)(2) (M = Ni, Co) |
| title | Magnetic ground state of the one-dimensional ferromagnetic chain compounds M(NCS)(2)(thiourea)(2) (M = Ni, Co) |
| title_full | Magnetic ground state of the one-dimensional ferromagnetic chain compounds M(NCS)(2)(thiourea)(2) (M = Ni, Co) |
| title_fullStr | Magnetic ground state of the one-dimensional ferromagnetic chain compounds M(NCS)(2)(thiourea)(2) (M = Ni, Co) |
| title_full_unstemmed | Magnetic ground state of the one-dimensional ferromagnetic chain compounds M(NCS)(2)(thiourea)(2) (M = Ni, Co) |
| title_short | Magnetic ground state of the one-dimensional ferromagnetic chain compounds M(NCS)(2)(thiourea)(2) (M = Ni, Co) |
| title_sort | magnetic ground state of the one dimensional ferromagnetic chain compounds m ncs 2 thiourea 2 m ni co |
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