{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1360004239502624000.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.3390/magnetochemistry3010010"}},{"identifier":{"@type":"URI","@value":"https://www.mdpi.com/2312-7481/3/1/10/pdf"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Antiferromagnetic Insulating Ground State of  Molecular π-d System Λ-(BETS)2FeCl4   (BETS = Bis(ethylenedithio)tetraselenafulvalene):   A Theoretical and Experimental Review"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>The πd molecular conductor λ‐(BETS)2FeCl4, where BETS is bis(ethylenedithio) tetraselenafulvalene, has attracted considerable interest for the discovery of its field induced superconducting state. A mystery of this system is its antiferromagnetic insulating ground state. The point still under strong debate is whether the d spins in Fe3+ are ordered or not. Here, we review experimental and theoretical studies on the antiferromagnetic insulating phase in λ‐(BETS)2FeCl4 and mention our perspective based on our ESR measurements for λ‐(BETS)2FexGa1−xCl4. Our ESR results indicate that the π‐d interaction in the system is very strong and there is no sign of paramagnetic Fe spins in the antiferromagnetic ground state.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1420001326206098176","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"10375107"},{"@type":"NRID","@value":"1000010375107"},{"@type":"NRID","@value":"9000312838735"},{"@type":"NRID","@value":"9000243742791"},{"@type":"NRID","@value":"9000017097165"},{"@type":"NRID","@value":"9000401976283"},{"@type":"NRID","@value":"9000264251865"},{"@type":"NRID","@value":"9000241171063"},{"@type":"NRID","@value":"9000398958575"},{"@type":"NRID","@value":"9000322088045"},{"@type":"NRID","@value":"9000277502949"},{"@type":"NRID","@value":"9000243742464"},{"@type":"NRID","@value":"9000243742480"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/hugolab"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/read0065814"}],"foaf:name":[{"@value":"Yugo Oshima"}],"jpcoar:affiliationName":[{"@value":"Condensed Molecular Materials Laboratory, RIKEN, Hirosawa 2‐1, Wako, Saitama 351‐0198, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004239502624130","@type":"Researcher","foaf:name":[{"@value":"Heng‐Bo Cui"}],"jpcoar:affiliationName":[{"@value":"Condensed Molecular Materials Laboratory, RIKEN, Hirosawa 2‐1, Wako, Saitama 351‐0198, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004239502624129","@type":"Researcher","foaf:name":[{"@value":"Reizo Kato"}],"jpcoar:affiliationName":[{"@value":"Condensed Molecular Materials Laboratory, RIKEN, Hirosawa 2‐1, Wako, Saitama 351‐0198, Japan"}]}],"publication":{"publicationIdentifier":[{"@type":"EISSN","@value":"23127481"}],"prism:publicationName":[{"@value":"Magnetochemistry"}],"dc:publisher":[{"@value":"MDPI AG"}],"prism:publicationDate":"2017-02-24","prism:volume":"3","prism:number":"1","prism:startingPage":"10"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","dc:rights":["https://creativecommons.org/licenses/by/4.0/"],"url":[{"@id":"https://www.mdpi.com/2312-7481/3/1/10/pdf"}],"createdAt":"2017-02-24","modifiedAt":"2025-10-11","project":[{"@id":"https://cir.nii.ac.jp/crid/1040000781910630272","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"16K04882"},{"@type":"JGN","@value":"JP16K04882"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16K04882/"}],"notation":[{"@language":"ja","@value":"偏光ESR法によるバレートロニクス物質の微視的評価とバレースピンポンピング"},{"@language":"en","@value":"Microscopic studies of the valleytronics materials by polarized ESR spectroscopy"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050001202757203328","@type":"Article","resourceType":"学術雑誌論文(journal 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xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mi>λ</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mtext>BEDSe-TTF</mml:mtext><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=\"normal\">GaCl</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>"}]},{"@id":"https://cir.nii.ac.jp/crid/1360003449881516928","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Effective Field Study of Canted Antiferromagnetic Insulating Phase in Magnetic Organic Conductor λ-(BETS)<sub>2</sub>FeCl<sub>4</sub> through Specific Heat Measurement"}]},{"@id":"https://cir.nii.ac.jp/crid/1360003449881897472","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Spin Structures and Phase Diagrams of Extended Spatially Completely Anisotropic Triangular Lattice Antiferromagnets"}]},{"@id":"https://cir.nii.ac.jp/crid/1360003449882036992","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Multistep Development of the Hyperfine Fields in λ-(BEDT-STF)<sub>2</sub>FeCl<sub>4</sub> Studied by Mössbauer Spectroscopy"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011143781936256","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Fermi surface studies in the magnetic-field-induced superconductor<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><mml:mi>λ</mml:mi><mml:mo>−</mml:mo><mml:mo>(</mml:mo><mml:mi mathvariant=\"normal\">BETS</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=\"normal\">FeCl</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011144940806144","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Torque anisotropy in λ-(BEDT-TSF)2FeCl4"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011145852713600","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"New BETS Conductors with Magnetic Anions (BETS = bis(ethylenedithio)tetraselenafulvalene)"}]},{"@id":"https://cir.nii.ac.jp/crid/1360283694086250240","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Temperature-Composition Phase Diagram of the Organic Alloys, λ-BETS2(FeXGa1−X)Cl4, with Mixed Magnetic and Non-Magnetic Anions"}]},{"@id":"https://cir.nii.ac.jp/crid/1360284921847247744","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Magnetic and Thermal Properties of λ-(BETS)<sub>2</sub>FeCl<sub>4</sub> System –Fe 3<i>d</i> Spin in Antiferromagnetic Insulating Phase–"}]},{"@id":"https://cir.nii.ac.jp/crid/1360284924858676864","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Spin Wave Theory in Two-Dimensional Coupled Antiferromagnets"}]},{"@id":"https://cir.nii.ac.jp/crid/1360290617682723456","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Selective observation of sublattice magnetization in the molecular \n<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mrow><mml:mi>π</mml:mi><mml:mo>−</mml:mo><mml:mi>d</mml:mi></mml:mrow></mml:math>\n system \n<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mrow><mml:mi>λ</mml:mi><mml:mo>−</mml:mo><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>BEDT</mml:mi><mml:mo>−</mml:mo><mml:mi>STF</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>FeCl</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>\n studied by \n<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mmultiscripts><mml:mi mathvariant=\"normal\">C</mml:mi><mml:mprescripts/><mml:none/><mml:mn>13</mml:mn></mml:mmultiscripts></mml:math>\n NMR"}]},{"@id":"https://cir.nii.ac.jp/crid/1360565169058373632","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Electronic and Magnetic Properties of Organic Conductors (DMET)2MBr4 (M = Fe, Ga)"}]},{"@id":"https://cir.nii.ac.jp/crid/1360568469972247936","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Spin-density wave in the vicinity of superconducting state in \n<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mrow><mml:mi>λ</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>BETS</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>GaBr</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>Cl</mml:mi><mml:mrow><mml:mn>4</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>\n probed by \n<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mmultiscripts><mml:mi mathvariant=\"normal\">C</mml:mi><mml:mprescripts/><mml:none/><mml:mn>13</mml:mn></mml:mmultiscripts></mml:math>\n NMR spectroscopy"}]},{"@id":"https://cir.nii.ac.jp/crid/1360571725246196736","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Magnetic Structures of Electron Systems on the Extended Spatially Completely Anisotropic Triangular Lattice near Quantum Critical Points"}]},{"@id":"https://cir.nii.ac.jp/crid/1360574093819911808","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Fermi surface and internal magnetic field of the organic conductors<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><mml:mi>λ</mml:mi><mml:mo>−</mml:mo><mml:mo>(</mml:mo><mml:mi mathvariant=\"normal\">BETS</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=\"normal\">Fe</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=\"normal\">Ga</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=\"normal\">Cl</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>"}]},{"@id":"https://cir.nii.ac.jp/crid/1360574094741372288","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Magnetotransport Measurements on the λ-Phase of the Organic Conductors (BETS)\n                    <sub>2</sub>\n                    MCl\n                    <sub>4</sub>\n                    (M = Ga, Fe). Magnetic-Field-Restored Highly Conducting State in λ-(BETS)\n                    <sub>2</sub>\n                    FeCl\n                    <sub>4</sub>"}]},{"@id":"https://cir.nii.ac.jp/crid/1360574096552364800","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Magnetic-field-induced superconductivity in layered organic molecular crystals with localized magnetic moments"}]},{"@id":"https://cir.nii.ac.jp/crid/1360847871800905472","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Paramagnetic Metal–Antiferromagnetic Insulator Transition of λ-BETS<sub>2</sub>Fe<sub><i>x</i></sub>Ga<sub>1-<i>x</i></sub>Cl<sub>4</sub> System"}]},{"@id":"https://cir.nii.ac.jp/crid/1360847874811717632","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Charge Transport in Antiferromagnetic Insulating Phase of Two-Dimensional Organic Conductor λ-(BETS)<sub>2</sub>FeCl<sub>4</sub>"}]},{"@id":"https://cir.nii.ac.jp/crid/1360853567444942464","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Microscopic Observation of π Spin Polarization by d Localized Spin in λ Type BETS Based Organic Superconductors"}]},{"@id":"https://cir.nii.ac.jp/crid/1360855568792912256","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Coupling of metal-insulator and antiferromagnetic transitions in the highly correlated organic conductor incorporating magnetic anions,<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><mml:mi>λ</mml:mi><mml:mo>−</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=\"normal\">BETS</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=\"normal\">FeBr</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=\"normal\">Cl</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><mml:mo>[</mml:mo><mml:mi mathvariant=\"normal\">B</mml:mi><mml:mi mathvariant=\"normal\">E</mml:mi><mml:mi mathvariant=\"normal\">T</mml:mi><mml:mi mathvariant=\"normal\">S</mml:mi><mml:mo>=</mml:mo><mml:mi mathvariant=\"normal\">B</mml:mi><mml:mi mathvariant=\"normal\">i</mml:mi><mml:mi mathvariant=\"normal\">s</mml:mi><mml:mo>(</mml:mo><mml:mi mathvariant=\"normal\">ethylenedithio</mml:mi><mml:mo>)</mml:mo><mml:mi mathvariant=\"normal\">tetraselenafulvalene</mml:mi><mml:mo>]</mml:mo></mml:math>"}]},{"@id":"https://cir.nii.ac.jp/crid/1360855568796983040","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Giant negative magnetoresistance in quasi-one-dimensional conductor<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><mml:mi mathvariant=\"normal\">TPP</mml:mi><mml:mo>[</mml:mo><mml:mi mathvariant=\"normal\">Fe</mml:mi><mml:mo>(</mml:mo><mml:mi mathvariant=\"normal\">Pc</mml:mi><mml:mo>)</mml:mo><mml:mo>(</mml:mo><mml:mi mathvariant=\"normal\">CN</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mo>]</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>:</mml:mo></mml:math>Interplay between local moments and one-dimensional conduction electrons"}]},{"@id":"https://cir.nii.ac.jp/crid/1360855570100216832","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><mml:mmultiscripts><mml:mi mathvariant=\"normal\">H</mml:mi><mml:mprescripts/><mml:none/><mml:mn>1</mml:mn></mml:mmultiscripts></mml:math>-NMR spin-echo measurements of the spin dynamic properties in<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><mml:mrow><mml:mi>λ</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>BETS</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant=\"normal\">Fe</mml:mi><mml:msub><mml:mi mathvariant=\"normal\">Cl</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>"}]},{"@id":"https://cir.nii.ac.jp/crid/1360861288379237632","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mmultiscripts><mml:mi mathvariant=\"normal\">C</mml:mi><mml:mprescripts/><mml:none/><mml:mn>13</mml:mn></mml:mmultiscripts></mml:math>\n NMR study of the stabilization of the antiferromagnetic ground state and the emergence of unconventional magnetic state in a molecular \n<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mi>π</mml:mi><mml:mtext>−</mml:mtext><mml:mi>d</mml:mi></mml:math>\n system"}]},{"@id":"https://cir.nii.ac.jp/crid/1361137044801078016","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Phase diagram and anomalous constant resistivity state of a magnetic organic superconducting alloy, λ-(BETS)<sub>2</sub>FexGa<sub>1−x</sub>Cl<sub>4</sub>"}]},{"@id":"https://cir.nii.ac.jp/crid/1361418519936870784","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Magnetic-field-induced superconductivity in a two-dimensional organic conductor"}]},{"@id":"https://cir.nii.ac.jp/crid/1362544418561575296","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Magnetic torque of λ-(BETS)2FeCl4"}]},{"@id":"https://cir.nii.ac.jp/crid/1362544420949566464","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Specific heat studies for λ-(BEDT-TSF)2FeCl4"}]},{"@id":"https://cir.nii.ac.jp/crid/1362825893512259200","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Interplay between chains of localised spins and two-dimensional sheets of organic donors in the synthetically built magnetic 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