{"paper_id":"1da33e3a-fd95-41b8-a9e1-7eacad51c9c5","body_text":"Robust Flat-Magnetoresistivity in a 3D Nodal Flat-band Semimetal | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Physical Sciences - Article Robust Flat-Magnetoresistivity in a 3D Nodal Flat-band Semimetal Taishi Chen, Ruoqi Wang, Xin Gu, Haofu Wen, Bo Zhao, Shijun Yuan, and 5 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6365101/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted You are reading this latest preprint version Abstract Electrical resistivity quantifies a material's ability to impede the flow of electric current. The resistance in an external magnetic field (the magnetoresistance, MR) may increase (positive MR) or decrease (negative MR), with extremely rare instances of remaining unchanged, particularly in an order of decades of tesla. Here, we report the exotic MR observed in a high-quality Fe3Ga single crystal. Particularly, we discovered a flat-MR in the 3D nodal flat-band semimetal Fe3Ga, which robustly unchanged under the magnetic field as strong as 33 teslas. Furthermore, we found the 3D nodal flat-band induced planar Hall effect (PHE) and planar longitudinal magnetoresistance (PLMR) precisely twice the amplitude depicted by the prevailing chiral anomaly theory. Our findings open a new path to the understanding of the exotic MR in 3D nodal flat-band but also demonstrate that the high-quality Fe₃Ga acts as an ideal platform for innovating advanced quantum devices. Physical sciences/Materials science/Condensed-matter physics/Topological matter Physical sciences/Physics/Condensed-matter physics/Electronic properties and materials Full Text Additional Declarations There is NO Competing Interest. Supplementary Files Supplementary.pdf Robust Flat-Magnetoresistivity in a 3D Nodal Flat-band Semimetal Cite Share Download PDF Status: Under Review Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {\"props\":{\"pageProps\":{\"initialData\":{\"identity\":\"rs-6365101\",\"acceptedTermsAndConditions\":true,\"allowDirectSubmit\":false,\"archivedVersions\":[],\"articleType\":\"Physical Sciences - Article\",\"associatedPublications\":[],\"authors\":[{\"id\":501015642,\"identity\":\"4ce68b78-164d-46c5-93c8-fc0bd3f4072f\",\"order_by\":0,\"name\":\"Taishi Chen\",\"email\":\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA6klEQVRIiWNgGAWjYDACCShpwMx8ACJygBgtB8Ba2BJI0sLAYMDAY0CcFv7Zzccef6ixsDdn5/n84WMbgxzfjQTGzwX4LLlzLN3gwDGJxJ3NvNskZ7YxGEveSGCWnoFHi4FEjpnEATaJBIPDvNuYedsYEjfcSGBj5sGrJf+bxIF/EvYGh3kef/7bxlBPhJYcNomDbRKMGw7zMEgztjEkGBDSInEjzUzibJ9E4obDbGaSPeckDGeeedgsjU8L/4zkZxIV3+rsDc4ffvzhR5mNPN/x5IOf8WnBsBWIGRtI0DAKRsEoGAWjABsAAEMHSdddBJ35AAAAAElFTkSuQmCC\",\"orcid\":\"https://orcid.org/0000-0003-1827-6614\",\"institution\":\"Southeast University\",\"correspondingAuthor\":true,\"prefix\":\"\",\"firstName\":\"Taishi\",\"middleName\":\"\",\"lastName\":\"Chen\",\"suffix\":\"\"},{\"id\":501015643,\"identity\":\"edbb6dc4-f168-4917-9caa-640d3d660cee\",\"order_by\":1,\"name\":\"Ruoqi Wang\",\"email\":\"\",\"orcid\":\"\",\"institution\":\"Southeast University\",\"correspondingAuthor\":false,\"prefix\":\"\",\"firstName\":\"Ruoqi\",\"middleName\":\"\",\"lastName\":\"Wang\",\"suffix\":\"\"},{\"id\":501015644,\"identity\":\"242dfa2b-26b5-42e8-9b77-6198b9a2a8a0\",\"order_by\":2,\"name\":\"Xin Gu\",\"email\":\"\",\"orcid\":\"\",\"institution\":\"Southeast University\",\"correspondingAuthor\":false,\"prefix\":\"\",\"firstName\":\"Xin\",\"middleName\":\"\",\"lastName\":\"Gu\",\"suffix\":\"\"},{\"id\":501015645,\"identity\":\"e1ce0acb-4272-44ec-8aa6-8dd5ae76dc83\",\"order_by\":3,\"name\":\"Haofu Wen\",\"email\":\"\",\"orcid\":\"\",\"institution\":\"Southeast University\",\"correspondingAuthor\":false,\"prefix\":\"\",\"firstName\":\"Haofu\",\"middleName\":\"\",\"lastName\":\"Wen\",\"suffix\":\"\"},{\"id\":501015646,\"identity\":\"ecdfd6b5-77b7-40b4-8e74-2f21efa85128\",\"order_by\":4,\"name\":\"Bo Zhao\",\"email\":\"\",\"orcid\":\"\",\"institution\":\"Chinese Academy of Sciences Shanghai Advanced Research Institute\",\"correspondingAuthor\":false,\"prefix\":\"\",\"firstName\":\"Bo\",\"middleName\":\"\",\"lastName\":\"Zhao\",\"suffix\":\"\"},{\"id\":501015647,\"identity\":\"14921602-07ca-4047-804b-b9c08b634696\",\"order_by\":5,\"name\":\"Shijun Yuan\",\"email\":\"\",\"orcid\":\"\",\"institution\":\"Southeast University\",\"correspondingAuthor\":false,\"prefix\":\"\",\"firstName\":\"Shijun\",\"middleName\":\"\",\"lastName\":\"Yuan\",\"suffix\":\"\"},{\"id\":501015648,\"identity\":\"6112e862-9252-4eaa-9df4-c289defc67dc\",\"order_by\":6,\"name\":\"Mingliang Wu\",\"email\":\"\",\"orcid\":\"\",\"institution\":\"Southeast University\",\"correspondingAuthor\":false,\"prefix\":\"\",\"firstName\":\"Mingliang\",\"middleName\":\"\",\"lastName\":\"Wu\",\"suffix\":\"\"},{\"id\":501015649,\"identity\":\"12741a2e-24e1-41bd-89e9-c7fa2f0af1bb\",\"order_by\":7,\"name\":\"Chuanying Xi\",\"email\":\"\",\"orcid\":\"\",\"institution\":\"Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences, Hefei 230031, P. 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