{"id":1509,"date":"2024-02-29T13:49:27","date_gmt":"2024-02-29T18:49:27","guid":{"rendered":"https:\/\/tickle.utk.edu\/mse\/?p=1509"},"modified":"2024-05-14T13:55:09","modified_gmt":"2024-05-14T17:55:09","slug":"meier-resolves-kagome-material-mystery","status":"publish","type":"post","link":"https:\/\/tickle.utk.edu\/mse\/meier-resolves-kagome-material-mystery\/","title":{"rendered":"Meier Resolves Kagome Material Mystery"},"content":{"rendered":"<p>Imagine using wires made from three electrically conductive metals to hook three light bulbs up to a battery. Two of the bulbs light up\u2014but the last one flickers and sputters, its electrical supply somehow inconsistent.<\/p>\n<p>UT alum Hasitha Suriya Arachchige (PhD \u201822) encountered this mystery on an atomic scale. As a member of the Emergent Crystalline Matter group (ECM) led by joint UT-Oak Ridge National Laboratory (ORNL) Professor\u00a0<a href=\"\/mse\/faculty\/david-mandrus\/\">David Mandrus<\/a>, he had been studying a type of quantum material called kagome lattices.<\/p>\n<p>\u201cThe way the atoms are bonded in a kagome lattice causes the electrons to move around in special ways,\u201d explained William Meier, a postdoctoral researcher in the ECM group. \u201cThis can be used to create unusual physical properties and make new electrical devices.\u201d<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"800\" class=\"alignnone size-full wp-image-1512\" src=\"https:\/\/tickle.utk.edu\/mse\/wp-content\/uploads\/sites\/2\/2024\/05\/crystals.jpg\" alt=\"crystals\" srcset=\"https:\/\/tickle.utk.edu\/mse\/wp-content\/uploads\/sites\/2\/2024\/05\/crystals.jpg 1200w, https:\/\/tickle.utk.edu\/mse\/wp-content\/uploads\/sites\/2\/2024\/05\/crystals-300x200.jpg 300w, https:\/\/tickle.utk.edu\/mse\/wp-content\/uploads\/sites\/2\/2024\/05\/crystals-1024x683.jpg 1024w, https:\/\/tickle.utk.edu\/mse\/wp-content\/uploads\/sites\/2\/2024\/05\/crystals-768x512.jpg 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/p>\n<p>Kagome materials may be the key to many unique phenomena including quantum spin liquids and skyrmion magnets, which are promising for next-generation data storage. Suriya Arachchige had been investigating the properties of kagome materials made with vanadium (V), tin (Sn), and one of three chemically similar rare earth elements: lutetium (Lu), yttrium (Y), or scandium (Sc).<\/p>\n<p>The lattices including lutetium and yttrium atoms transmitted electricity as expected, but the stuttered flow through the scandium compound\u2014ScV<sub>6<\/sub>Sn<sub>6<\/sub>\u2014presented an exciting opportunity.<\/p>\n<p>\u201cWhenever we discover an unusual behavior in a material,\u201d Meier said, \u201cwe ask two questions: \u2018Why did that happen? And how can I change it?\u2019\u201d<\/p>\n<h2 class=\"orange-mark\">Catching the Waves<\/h2>\n<p>Charge density waves (CDWs) are modified versions of a material\u2019s chemical structure that can alter its electrical properties, leading to strange behavior like ScV<sub>6<\/sub>Sn<sub>6<\/sub>\u2019s staggered electrical flow.<\/p>\n<p>\u201cIt is often challenging to predict when and why CDWs form,\u201d Meier said, \u201cbut we are excited to find them, since we can often chemically modify their host materials to find new superconductors.\u201d<\/p>\n<p>The ECM group is fully equipped to investigate CDWs when they appear, with a full suite of elements, furnaces, and equipment dedicated to making unusual materials like ScV<sub>6<\/sub>Sn<sub>6<\/sub>. UT\u2019s\u00a0<a href=\"https:\/\/research.utk.edu\/iamm\/\">Institute for Advanced Materials and Manufacturing<\/a>\u00a0(IAMM) also contains many high-end instruments for characterizing those materials and exploring their properties.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"800\" class=\"alignnone size-full wp-image-1511\" src=\"https:\/\/tickle.utk.edu\/mse\/wp-content\/uploads\/sites\/2\/2024\/05\/Untitled-1.jpg\" alt=\"kagome materials research lab\" srcset=\"https:\/\/tickle.utk.edu\/mse\/wp-content\/uploads\/sites\/2\/2024\/05\/Untitled-1.jpg 1200w, https:\/\/tickle.utk.edu\/mse\/wp-content\/uploads\/sites\/2\/2024\/05\/Untitled-1-300x200.jpg 300w, https:\/\/tickle.utk.edu\/mse\/wp-content\/uploads\/sites\/2\/2024\/05\/Untitled-1-1024x683.jpg 1024w, https:\/\/tickle.utk.edu\/mse\/wp-content\/uploads\/sites\/2\/2024\/05\/Untitled-1-768x512.jpg 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/p>\n<p>Meier worked with many other members of the ECM group to create pure ScV<sub>6<\/sub>Sn<sub>6<\/sub>\u00a0samples, including postdocs Shirin Mozaffari and Richa Pokharel Madhogaria and two undergraduate students, Caleb Allen and Jeremy Driver. The team also fabricated a series of crystals doped with varying levels of lutetium and yttrium to help determine the ratio of scandium needed to allow the formation of CDWs.<\/p>\n<p>To characterize the crystals\u2019 structures, the team used the equipment at IAMM and collaborated with experts at ORNL and the\u00a0<a href=\"https:\/\/nationalmaglab.org\/\">National High Magnetic Field Laboratory<\/a>\u00a0(Maglab) in Florida.<\/p>\n<p>\u201cUT\u2019s strong relationship with the scientists at ORNL was critical for this study,\u201d Meier said. \u201cThey helped us plan and execute specialized experiments quickly and efficiently.\u201d<\/p>\n<p>ORNL scientist\u00a0<a href=\"https:\/\/www.ornl.gov\/staff-profile\/michael-mcguire\">Michael McGuire<\/a>\u00a0evaluated the electrical resistance of each sample from room temperature down to a frigid 0.09 degrees Kelvin (-460\u00b0 F), looking for signs of superconductivity. (Alas, there are no superconductors in this batch.)<\/p>\n<p>Senior ORNL staff scientist\u00a0<a href=\"https:\/\/www.ornl.gov\/staff-profile\/huibo-cao\">Huibo Cao<\/a>\u00a0and postdoctoral researcher\u00a0<a href=\"https:\/\/www.ornl.gov\/staff-profile\/madalynn-g-marshall\">Madalynn Marshall<\/a>\u00a0obtained detailed data on the crystals\u2019 structures, observing how CDW prevalence changed based on the rare earth elements\u2019 atomic sizes, atomic masses, and other factors.<\/p>\n<p>\u201cWe were able to determine that it is the size of the rare earth atom that determines whether a CDW can form,\u201d Meier explained. \u201cScandium is small enough to give the surrounding atoms room to \u2018rattle\u2019, altering the course of the electrons; substituting in the larger lutetium or yttrium atoms removes that extra space and prevents the CDW from forming.\u201d<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"800\" class=\"alignnone size-full wp-image-1510\" src=\"https:\/\/tickle.utk.edu\/mse\/wp-content\/uploads\/sites\/2\/2024\/05\/Untitled-1-1.jpg\" alt=\"Student studies kagome crystals under a microscope.\" srcset=\"https:\/\/tickle.utk.edu\/mse\/wp-content\/uploads\/sites\/2\/2024\/05\/Untitled-1-1.jpg 1200w, https:\/\/tickle.utk.edu\/mse\/wp-content\/uploads\/sites\/2\/2024\/05\/Untitled-1-1-300x200.jpg 300w, https:\/\/tickle.utk.edu\/mse\/wp-content\/uploads\/sites\/2\/2024\/05\/Untitled-1-1-1024x683.jpg 1024w, https:\/\/tickle.utk.edu\/mse\/wp-content\/uploads\/sites\/2\/2024\/05\/Untitled-1-1-768x512.jpg 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/p>\n<p>This hypothesis, which Meier dubbed the rattling chain model, was supported by further experiments by\u00a0<a href=\"https:\/\/nationalmaglab.org\/staff\/?name=DavidGraf\">David Graf<\/a>\u00a0at MagLab. Graf demonstrated that high pressure\u2014forcing the atoms to stay put\u2014further suppresses CDW formation in lutetium-doped ScV<sub>6<\/sub>Sn<sub>6<\/sub>\u00a0crystals.<\/p>\n<p>\u201cIt is often difficult to find a straightforward story in science,\u201d Meier reflected. \u201cThis was a rare case where the pieces showed a nice clean story.\u201d<\/p>\n<p>While no new superconductors revealed themselves during the project, Meier is excited to have resolved the mystery of this particular CDW.<\/p>\n<p>\u201cOur work exploring kagome metals is part of a broader search for new quantum materials and their valuable properties,\u201d he said. \u201cMy rattling chain model helps us understand the behavior of the materials we have and will let us better predict the behavior of those we try to create.\u201d<\/p>\n<h2 class=\"orange-mark h3\">Contact<\/h2>\n<p>Izzie Gall (865-974-7203,\u00a0<a href=\"mailto:egall4@utk.edu\">egall4@utk.edu<\/a>)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A kagome material\u2019s mysterious quirk, discovered at UT, has now been explained by postdoctoral researcher William Meier\u2019s rattling chain model. <\/p>\n","protected":false},"author":46,"featured_media":1513,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[14,400],"tags":[39,429,430,413,431,7],"class_list":["post-1509","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-ornl","tag-david-mandrus","tag-emergent-crystalline-matter","tag-hasitha-suriya-arachchige","tag-iamm","tag-kagome-materials","tag-ornl"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - 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