Pub Date : 2022-02-25DOI: 10.1080/10448632.2022.2035175
Zheng He, Jun Zhao, Devashibhai Adr oja
Geometrical frustration is a phenomenon present in lattices that are based on triangles or tetrahedra. It may prevent long-range magnetic order and lead to highly degenerated ground states with exotic spin-spin correlations and emergent excitations. The spinel oxide ACr 2 O 4 is a canonical geometrically frustrated magnet. Transition metal chromium (Cr) atoms, which are arranged into a crystal structure with an octagonal base, form a pyrochlore lattice with corner-sharing tet-rahedra. The pyrochlore lattice consists of alternating stacked kagome and triangle planes along the [111] di-rection and is highly frustrated. These Cr spinel oxides become ordered at a lower temperature than that the Curie-Weiss model predicts; this is to do with them be-ing highly frustrated. The Cr spinel oxide ACr 2 O 4 exhibit exotic excitation spectra dominated by a dispersionless sharp resonance mode instead of conventional dispersive spin waves in the magnetically ordered states. Currently, there is not a unified description of the resonance mode. Furthermore, there is also not clear causation for the underlying magnetic exchange interaction that induces the resonance mode among different types of Cr spinel oxides. The study the nature spin and 4 8 performed MERLIN direct geometry chopper spectrometer the a dispersionless resonance and dispersive spin-wave
{"title":"Unified Picture for the Spin Resonance Mode in Cr-Based Spinel Oxides Using Inelastic Neutron Scattering","authors":"Zheng He, Jun Zhao, Devashibhai Adr oja","doi":"10.1080/10448632.2022.2035175","DOIUrl":"https://doi.org/10.1080/10448632.2022.2035175","url":null,"abstract":"Geometrical frustration is a phenomenon present in lattices that are based on triangles or tetrahedra. It may prevent long-range magnetic order and lead to highly degenerated ground states with exotic spin-spin correlations and emergent excitations. The spinel oxide ACr 2 O 4 is a canonical geometrically frustrated magnet. Transition metal chromium (Cr) atoms, which are arranged into a crystal structure with an octagonal base, form a pyrochlore lattice with corner-sharing tet-rahedra. The pyrochlore lattice consists of alternating stacked kagome and triangle planes along the [111] di-rection and is highly frustrated. These Cr spinel oxides become ordered at a lower temperature than that the Curie-Weiss model predicts; this is to do with them be-ing highly frustrated. The Cr spinel oxide ACr 2 O 4 exhibit exotic excitation spectra dominated by a dispersionless sharp resonance mode instead of conventional dispersive spin waves in the magnetically ordered states. Currently, there is not a unified description of the resonance mode. Furthermore, there is also not clear causation for the underlying magnetic exchange interaction that induces the resonance mode among different types of Cr spinel oxides. The study the nature spin and 4 8 performed MERLIN direct geometry chopper spectrometer the a dispersionless resonance and dispersive spin-wave","PeriodicalId":39014,"journal":{"name":"Neutron News","volume":"33 1","pages":"6 - 7"},"PeriodicalIF":0.0,"publicationDate":"2022-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46446765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-24DOI: 10.1080/10448632.2022.2038956
Rob Robinson, T. Finlayson
{"title":"Anthony (Tony) George Klein (1935–2021)","authors":"Rob Robinson, T. Finlayson","doi":"10.1080/10448632.2022.2038956","DOIUrl":"https://doi.org/10.1080/10448632.2022.2038956","url":null,"abstract":"","PeriodicalId":39014,"journal":{"name":"Neutron News","volume":"33 1","pages":"19 - 19"},"PeriodicalIF":0.0,"publicationDate":"2022-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43456090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-23DOI: 10.1080/10448632.2022.2035579
D. Zákutná, K. Graef, D. Dresen, L. Porcar, D. Honecker, S. Disch
Neutron News 8 Science Snapshot Smart Fluids – When Shear and Magnetic Forces Compete D. Zákutná1 , K. Graef2, D. Dresen2, L. Porcar3, D. Honecker4 , and S. Disch2 1 Department of Inorganic Chemistry, Faculty of Science, Charles University, Prague, Czechia 2 Department of Chemistry, Universität zu Köln, Cologne, Germany 3 Institut Laue-Langevin, Grenoble, France 4 ISIS Neutron and Muon Source, Didcot, Oxfordshire, UK
中子新闻8科学快照智能流体-当剪切力和磁力竞争D. Zákutná1, K. Graef2, D. Dresen2, L. Porcar3, D. Honecker4, S. Disch2 1捷克布拉格查尔斯大学理学院无机化学系2德国科隆化学系Universität zu Köln 3法国格勒诺布尔Laue-Langevin研究所4 ISIS中子和介子源，英国牛牛郡迪德考特
{"title":"Smart Fluids – When Shear and Magnetic Forces Compete","authors":"D. Zákutná, K. Graef, D. Dresen, L. Porcar, D. Honecker, S. Disch","doi":"10.1080/10448632.2022.2035579","DOIUrl":"https://doi.org/10.1080/10448632.2022.2035579","url":null,"abstract":"Neutron News 8 Science Snapshot Smart Fluids – When Shear and Magnetic Forces Compete D. Zákutná1 , K. Graef2, D. Dresen2, L. Porcar3, D. Honecker4 , and S. Disch2 1 Department of Inorganic Chemistry, Faculty of Science, Charles University, Prague, Czechia 2 Department of Chemistry, Universität zu Köln, Cologne, Germany 3 Institut Laue-Langevin, Grenoble, France 4 ISIS Neutron and Muon Source, Didcot, Oxfordshire, UK","PeriodicalId":39014,"journal":{"name":"Neutron News","volume":"33 1","pages":"8 - 10"},"PeriodicalIF":0.0,"publicationDate":"2022-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43221884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-22DOI: 10.1080/10448632.2022.2035173
Stephen Nagler, Tom Holden, J. Root, Chris Stock, G. Lander
{"title":"William (Bill) James Leslie Buyers (1937–2021)","authors":"Stephen Nagler, Tom Holden, J. Root, Chris Stock, G. Lander","doi":"10.1080/10448632.2022.2035173","DOIUrl":"https://doi.org/10.1080/10448632.2022.2035173","url":null,"abstract":"","PeriodicalId":39014,"journal":{"name":"Neutron News","volume":"33 1","pages":"14 - 15"},"PeriodicalIF":0.0,"publicationDate":"2022-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42469183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-22DOI: 10.1080/10448632.2022.2035174
L. Daemen, S. Parker, J. Tomkinson, L. Passell
{"title":"John Larese (1954–2021)","authors":"L. Daemen, S. Parker, J. Tomkinson, L. Passell","doi":"10.1080/10448632.2022.2035174","DOIUrl":"https://doi.org/10.1080/10448632.2022.2035174","url":null,"abstract":"","PeriodicalId":39014,"journal":{"name":"Neutron News","volume":"33 1","pages":"16 - 16"},"PeriodicalIF":0.0,"publicationDate":"2022-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47193100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-08DOI: 10.1080/10448632.2021.1996857
Ross Stewart, K. Niss, T. Ramirez-Cuesta, K. Herwig
{"title":"QENS/WINS Topical Discussions","authors":"Ross Stewart, K. Niss, T. Ramirez-Cuesta, K. Herwig","doi":"10.1080/10448632.2021.1996857","DOIUrl":"https://doi.org/10.1080/10448632.2021.1996857","url":null,"abstract":"","PeriodicalId":39014,"journal":{"name":"Neutron News","volume":"32 1","pages":"7 - 8"},"PeriodicalIF":0.0,"publicationDate":"2022-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49095955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-08DOI: 10.1080/10448632.2021.1996859
A. Arbe, J. Colmenero
{"title":"QENS/WINS2021: Keeping the Community Motivated and Cohesive","authors":"A. Arbe, J. Colmenero","doi":"10.1080/10448632.2021.1996859","DOIUrl":"https://doi.org/10.1080/10448632.2021.1996859","url":null,"abstract":"","PeriodicalId":39014,"journal":{"name":"Neutron News","volume":"32 1","pages":"9 - 11"},"PeriodicalIF":0.0,"publicationDate":"2022-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41990883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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