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Magnetic studies reveal near-perfect paramagnetism in the molecular semiconductor vanadyl phthalocyanine (C32H16N8VO)
Temperature (0.5–300K) and magnetic field (H up to 90kOe) dependences of the magnetization (M) of a powder sample of vanadyl phthalocyanine (VOPc) having the Phase II-triclinic structure are measured and analyzed. The data of χ = M/H vs. T measured in H = 1kOe fit the modified Curie-Weiss (CW) law,...
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| Published in: | Journal of magnetism and magnetic materials 2017-01, Vol.422, p.386-390 |
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| cited_by | cdi_FETCH-LOGICAL-c372t-da9d596b3c2d571a428c6d202565a739d2667c067a117b801084d1166ac434013 |
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| cites | cdi_FETCH-LOGICAL-c372t-da9d596b3c2d571a428c6d202565a739d2667c067a117b801084d1166ac434013 |
| container_end_page | 390 |
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| container_start_page | 386 |
| container_title | Journal of magnetism and magnetic materials |
| container_volume | 422 |
| creator | Wang (王正君), Zhengjun Pi, Li Seehra, Mohindar S. Bindra, Jasleen van Tol, Hans Dalal, Naresh S. |
| description | Temperature (0.5–300K) and magnetic field (H up to 90kOe) dependences of the magnetization (M) of a powder sample of vanadyl phthalocyanine (VOPc) having the Phase II-triclinic structure are measured and analyzed. The data of χ = M/H vs. T measured in H = 1kOe fit the modified Curie-Weiss (CW) law, χ = χo+C/(T−θ), with C = 6.266×10−4 emuK/gOe, θ = −0.1K and χo = −9.3×10−7emu/gOe. The Curie constant C yields magnetic moment μ = 1.704μB, S = 1/2, and g = 1.967 characteristic of VO2+. The magnitude of θ = −0.1K signifying very weak inter-ion antiferromagnetic exchange coupling is supported by the analysis of the variable frequency (9.8–336GHz) electron paramagnetic resonance data. The isothermal data of M vs. H at ten temperatures between 0.5K and 300K when plotted as M vs. H/(T+0.1) collapses on to a single curve given by M = Motanh {gμBH/[2kB(T+0.1)]} with Mo = NgμBS = 9.48emu/g expected for S = 1/2 system, thus signifying near perfect paramagnetism in VOPc.
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•Magnetization M vs. temperature T from 0.5K to 300K in H = 1kOe is reported.•M vs. T data fit Curie-Weiss law with θ = −0.1K, S = 1/2, &g = 1.967 for VO2+.•Isothermal M vs. H data (H up to 90kOe) for ten T from 0.5K to 300K is reported.•M vs. H/(T−θ) plot for various T fit a single Brillouin function curve for S = 1/2.•Analysis of magnetic and EPR data in VOPc shows near perfect S = 1/2 paramagnetism. |
| doi_str_mv | 10.1016/j.jmmm.2016.09.018 |
| format | article |
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[Display omitted]
•Magnetization M vs. temperature T from 0.5K to 300K in H = 1kOe is reported.•M vs. T data fit Curie-Weiss law with θ = −0.1K, S = 1/2, &g = 1.967 for VO2+.•Isothermal M vs. H data (H up to 90kOe) for ten T from 0.5K to 300K is reported.•M vs. H/(T−θ) plot for various T fit a single Brillouin function curve for S = 1/2.•Analysis of magnetic and EPR data in VOPc shows near perfect S = 1/2 paramagnetism.</description><identifier>ISSN: 0304-8853</identifier><identifier>EISSN: 1873-4766</identifier><identifier>DOI: 10.1016/j.jmmm.2016.09.018</identifier><language>eng</language><publisher>Amsterdam: Elsevier B.V</publisher><subject>Antiferromagnetism ; Coupling (molecular) ; Electron paramagnetic resonance ; Magnetic fields ; Magnetic molecular semiconductors ; Magnetic moments ; Magnetic resonance ; Magnetic susceptibility ; Magnetism ; Paramagnetism ; Saturation magnetization ; Semiconductors</subject><ispartof>Journal of magnetism and magnetic materials, 2017-01, Vol.422, p.386-390</ispartof><rights>2016 Elsevier B.V.</rights><rights>Copyright Elsevier BV Jan 15, 2017</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c372t-da9d596b3c2d571a428c6d202565a739d2667c067a117b801084d1166ac434013</citedby><cites>FETCH-LOGICAL-c372t-da9d596b3c2d571a428c6d202565a739d2667c067a117b801084d1166ac434013</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>315,786,790,27957,27958</link.rule.ids></links><search><creatorcontrib>Wang (王正君), Zhengjun</creatorcontrib><creatorcontrib>Pi, Li</creatorcontrib><creatorcontrib>Seehra, Mohindar S.</creatorcontrib><creatorcontrib>Bindra, Jasleen</creatorcontrib><creatorcontrib>van Tol, Hans</creatorcontrib><creatorcontrib>Dalal, Naresh S.</creatorcontrib><title>Magnetic studies reveal near-perfect paramagnetism in the molecular semiconductor vanadyl phthalocyanine (C32H16N8VO)</title><title>Journal of magnetism and magnetic materials</title><description>Temperature (0.5–300K) and magnetic field (H up to 90kOe) dependences of the magnetization (M) of a powder sample of vanadyl phthalocyanine (VOPc) having the Phase II-triclinic structure are measured and analyzed. The data of χ = M/H vs. T measured in H = 1kOe fit the modified Curie-Weiss (CW) law, χ = χo+C/(T−θ), with C = 6.266×10−4 emuK/gOe, θ = −0.1K and χo = −9.3×10−7emu/gOe. The Curie constant C yields magnetic moment μ = 1.704μB, S = 1/2, and g = 1.967 characteristic of VO2+. The magnitude of θ = −0.1K signifying very weak inter-ion antiferromagnetic exchange coupling is supported by the analysis of the variable frequency (9.8–336GHz) electron paramagnetic resonance data. The isothermal data of M vs. H at ten temperatures between 0.5K and 300K when plotted as M vs. H/(T+0.1) collapses on to a single curve given by M = Motanh {gμBH/[2kB(T+0.1)]} with Mo = NgμBS = 9.48emu/g expected for S = 1/2 system, thus signifying near perfect paramagnetism in VOPc.
[Display omitted]
•Magnetization M vs. temperature T from 0.5K to 300K in H = 1kOe is reported.•M vs. T data fit Curie-Weiss law with θ = −0.1K, S = 1/2, &g = 1.967 for VO2+.•Isothermal M vs. H data (H up to 90kOe) for ten T from 0.5K to 300K is reported.•M vs. H/(T−θ) plot for various T fit a single Brillouin function curve for S = 1/2.•Analysis of magnetic and EPR data in VOPc shows near perfect S = 1/2 paramagnetism.</description><subject>Antiferromagnetism</subject><subject>Coupling (molecular)</subject><subject>Electron paramagnetic resonance</subject><subject>Magnetic fields</subject><subject>Magnetic molecular semiconductors</subject><subject>Magnetic moments</subject><subject>Magnetic resonance</subject><subject>Magnetic susceptibility</subject><subject>Magnetism</subject><subject>Paramagnetism</subject><subject>Saturation magnetization</subject><subject>Semiconductors</subject><issn>0304-8853</issn><issn>1873-4766</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNp90LtO7DAQBmALgcSy8AJUlmigSI4vieNINGjF5UgcaIDWGuxZ1lHiBDtZad-erPbUVDPF_DOjj5BLznLOuPrT5E3XdbmY-5zVOeP6iCy4rmRWVEodkwWTrMi0LuUpOUupYYzxQqsFmf7BV8DRW5rGyXlMNOIWoaUBIWYDxjXakQ4QoTsMpo76QMcN0q5v0U4tRJqw87YPbrJjH-kWArhdS4fNuIG2tzsIPiC9XknxxNWL_ni9OScna2gTXvyvS_L-cP-2esqeXx__ru6eMysrMWYOalfW6lNa4cqKQyG0VU4wUaoSKlk7oVRlmaqA8-pTM8504ThXCmwhC8blklwd9g6x_54wjabppxjmk4bXUu8JZpIlEYcpG_uUIq7NEH0HcWc4M3te05g9r9nzGlabmXcO3R5COP-_9RhNsh6DRefjTGZc73-L_wDp64NG</recordid><startdate>20170115</startdate><enddate>20170115</enddate><creator>Wang (王正君), Zhengjun</creator><creator>Pi, Li</creator><creator>Seehra, Mohindar S.</creator><creator>Bindra, Jasleen</creator><creator>van Tol, Hans</creator><creator>Dalal, Naresh S.</creator><general>Elsevier B.V</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20170115</creationdate><title>Magnetic studies reveal near-perfect paramagnetism in the molecular semiconductor vanadyl phthalocyanine (C32H16N8VO)</title><author>Wang (王正君), Zhengjun ; Pi, Li ; Seehra, Mohindar S. ; Bindra, Jasleen ; van Tol, Hans ; Dalal, Naresh S.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c372t-da9d596b3c2d571a428c6d202565a739d2667c067a117b801084d1166ac434013</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Antiferromagnetism</topic><topic>Coupling (molecular)</topic><topic>Electron paramagnetic resonance</topic><topic>Magnetic fields</topic><topic>Magnetic molecular semiconductors</topic><topic>Magnetic moments</topic><topic>Magnetic resonance</topic><topic>Magnetic susceptibility</topic><topic>Magnetism</topic><topic>Paramagnetism</topic><topic>Saturation magnetization</topic><topic>Semiconductors</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wang (王正君), Zhengjun</creatorcontrib><creatorcontrib>Pi, Li</creatorcontrib><creatorcontrib>Seehra, Mohindar S.</creatorcontrib><creatorcontrib>Bindra, Jasleen</creatorcontrib><creatorcontrib>van Tol, Hans</creatorcontrib><creatorcontrib>Dalal, Naresh S.</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of magnetism and magnetic materials</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Wang (王正君), Zhengjun</au><au>Pi, Li</au><au>Seehra, Mohindar S.</au><au>Bindra, Jasleen</au><au>van Tol, Hans</au><au>Dalal, Naresh S.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Magnetic studies reveal near-perfect paramagnetism in the molecular semiconductor vanadyl phthalocyanine (C32H16N8VO)</atitle><jtitle>Journal of magnetism and magnetic materials</jtitle><date>2017-01-15</date><risdate>2017</risdate><volume>422</volume><spage>386</spage><epage>390</epage><pages>386-390</pages><issn>0304-8853</issn><eissn>1873-4766</eissn><abstract>Temperature (0.5–300K) and magnetic field (H up to 90kOe) dependences of the magnetization (M) of a powder sample of vanadyl phthalocyanine (VOPc) having the Phase II-triclinic structure are measured and analyzed. The data of χ = M/H vs. T measured in H = 1kOe fit the modified Curie-Weiss (CW) law, χ = χo+C/(T−θ), with C = 6.266×10−4 emuK/gOe, θ = −0.1K and χo = −9.3×10−7emu/gOe. The Curie constant C yields magnetic moment μ = 1.704μB, S = 1/2, and g = 1.967 characteristic of VO2+. The magnitude of θ = −0.1K signifying very weak inter-ion antiferromagnetic exchange coupling is supported by the analysis of the variable frequency (9.8–336GHz) electron paramagnetic resonance data. The isothermal data of M vs. H at ten temperatures between 0.5K and 300K when plotted as M vs. H/(T+0.1) collapses on to a single curve given by M = Motanh {gμBH/[2kB(T+0.1)]} with Mo = NgμBS = 9.48emu/g expected for S = 1/2 system, thus signifying near perfect paramagnetism in VOPc.
[Display omitted]
•Magnetization M vs. temperature T from 0.5K to 300K in H = 1kOe is reported.•M vs. T data fit Curie-Weiss law with θ = −0.1K, S = 1/2, &g = 1.967 for VO2+.•Isothermal M vs. H data (H up to 90kOe) for ten T from 0.5K to 300K is reported.•M vs. H/(T−θ) plot for various T fit a single Brillouin function curve for S = 1/2.•Analysis of magnetic and EPR data in VOPc shows near perfect S = 1/2 paramagnetism.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/j.jmmm.2016.09.018</doi><tpages>5</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Antiferromagnetism Coupling (molecular) Electron paramagnetic resonance Magnetic fields Magnetic molecular semiconductors Magnetic moments Magnetic resonance Magnetic susceptibility Magnetism Paramagnetism Saturation magnetization Semiconductors |
| title | Magnetic studies reveal near-perfect paramagnetism in the molecular semiconductor vanadyl phthalocyanine (C32H16N8VO) |
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