{"id":8087,"date":"2016-02-15T13:53:42","date_gmt":"2016-02-15T13:53:42","guid":{"rendered":"http:\/\/vps468643.ovh.net.s216418.gridserver.com\/?p=8087"},"modified":"2016-03-19T14:42:50","modified_gmt":"2016-03-19T14:42:50","slug":"spin-orders-and-lattice-distortions-of-geometrically-frustrated-6h","status":"publish","type":"post","link":"https:\/\/senngroup.com\/spin-orders-and-lattice-distortions-of-geometrically-frustrated-6h\/","title":{"rendered":"Spin orders and lattice distortions of geometrically frustrated 6H-perovskites Ba3B\u2032Ru2O9 (B\u2032\u2009=\u2009La3+, Nd3+, and Y3+)"},"content":{"rendered":"<p><a href=\"http:\/\/journals.aps.org\/prb\/abstract\/10.1103\/PhysRevB.87.134402\">Mark S. Senn, Simon A. J. Kimber, Angel M. Arevalo Lopez, Adrian H. Hill, and J. Paul Attfield, Physical Review B 87 (13), 134402<\/a><\/p>\n<p>The magnetic and crystal structures of the title materials have been investigated using high-resolution neutron and synchrotron x-ray powder diffraction. Ferromagnetic Ru dimers are observed in the spin-ordered ground states of all three materials, evidencing an intradimer double exchange interaction. Antiferromagnetic order between dimers breaks the degeneracy of the triangular lattice but no distortion of the <span class=\"aps-inline-formula\"><span id=\"MathJax-Element-8-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-46\" class=\"math\"><span id=\"MathJax-Span-47\" class=\"mrow\"><span id=\"MathJax-Span-48\" class=\"msup\"><span id=\"MathJax-Span-49\" class=\"mrow\"><span id=\"MathJax-Span-50\" class=\"mi\">B<\/span><\/span><span id=\"MathJax-Span-51\" class=\"mo\">\u2032<\/span><\/span><span id=\"MathJax-Span-52\" class=\"mrow\"><span id=\"MathJax-Span-53\" class=\"mo\">=<\/span><span id=\"MathJax-Span-54\" class=\"mi\">La<\/span><\/span><\/span><\/span><\/span><\/span> and Y structures is observed. The magnetic ordering transition temperature increases with the radius of the <span class=\"aps-inline-formula\"><span id=\"MathJax-Element-9-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-55\" class=\"math\"><span id=\"MathJax-Span-56\" class=\"mrow\"><span id=\"MathJax-Span-57\" class=\"msup\"><span id=\"MathJax-Span-58\" class=\"mrow\"><span id=\"MathJax-Span-59\" class=\"mi\">B<\/span><\/span><span id=\"MathJax-Span-60\" class=\"mo\">\u2032<\/span><\/span><\/span><\/span><\/span><\/span> cation. An anomalous 120 K structural transition in Ba<span class=\"aps-inline-formula\"><span id=\"MathJax-Element-10-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-61\" class=\"math\"><span id=\"MathJax-Span-62\" class=\"mrow\"><span id=\"MathJax-Span-63\" class=\"msub\"><span id=\"MathJax-Span-64\" class=\"mrow\"><\/span><span id=\"MathJax-Span-65\" class=\"mn\">3<\/span><\/span><\/span><\/span><\/span><\/span>NdRu<span class=\"aps-inline-formula\"><span id=\"MathJax-Element-11-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-66\" class=\"math\"><span id=\"MathJax-Span-67\" class=\"mrow\"><span id=\"MathJax-Span-68\" class=\"msub\"><span id=\"MathJax-Span-69\" class=\"mrow\"><\/span><span id=\"MathJax-Span-70\" class=\"mn\">2<\/span><\/span><\/span><\/span><\/span><\/span>O<span class=\"aps-inline-formula\"><span id=\"MathJax-Element-12-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-71\" class=\"math\"><span id=\"MathJax-Span-72\" class=\"mrow\"><span id=\"MathJax-Span-73\" class=\"msub\"><span id=\"MathJax-Span-74\" class=\"mrow\"><\/span><span id=\"MathJax-Span-75\" class=\"mn\">9<\/span><\/span><\/span><\/span><\/span><\/span> is attributed to Jahn-Teller distortion, evidenced by large-amplitude <span class=\"aps-inline-formula\"><span id=\"MathJax-Element-13-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-76\" class=\"math\"><span id=\"MathJax-Span-77\" class=\"mrow\"><span id=\"MathJax-Span-78\" class=\"msub\"><span id=\"MathJax-Span-79\" class=\"mi\">\u0393<\/span><span id=\"MathJax-Span-80\" class=\"mn\">6<\/span><\/span><\/span><\/span><\/span><\/span> deformations of the NdO<span class=\"aps-inline-formula\"><span id=\"MathJax-Element-14-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-81\" class=\"math\"><span id=\"MathJax-Span-82\" class=\"mrow\"><span id=\"MathJax-Span-83\" class=\"msub\"><span id=\"MathJax-Span-84\" class=\"mrow\"><\/span><span id=\"MathJax-Span-85\" class=\"mn\">6<\/span><\/span><\/span><\/span><\/span><\/span> octahedra. Further lattice anomalies accompany magnetic ordering transitions at 24 and 18 K in Ba<span class=\"aps-inline-formula\"><span id=\"MathJax-Element-15-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-86\" class=\"math\"><span id=\"MathJax-Span-87\" class=\"mrow\"><span id=\"MathJax-Span-88\" class=\"msub\"><span id=\"MathJax-Span-89\" class=\"mrow\"><\/span><span id=\"MathJax-Span-90\" class=\"mn\">3<\/span><\/span><\/span><\/span><\/span><\/span>NdRu<span class=\"aps-inline-formula\"><span id=\"MathJax-Element-16-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-91\" class=\"math\"><span id=\"MathJax-Span-92\" class=\"mrow\"><span id=\"MathJax-Span-93\" class=\"msub\"><span id=\"MathJax-Span-94\" class=\"mrow\"><\/span><span id=\"MathJax-Span-95\" class=\"mn\">2<\/span><\/span><\/span><\/span><\/span><\/span>O<span class=\"aps-inline-formula\"><span id=\"MathJax-Element-17-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-96\" class=\"math\"><span id=\"MathJax-Span-97\" class=\"mrow\"><span id=\"MathJax-Span-98\" class=\"msub\"><span id=\"MathJax-Span-99\" class=\"mrow\"><\/span><span id=\"MathJax-Span-100\" class=\"mn\">9<\/span><\/span><\/span><\/span><\/span><\/span>. Nd spins order ferromagnetically and a substantial magnetic anisotropy leads to large coercivity and <span class=\"aps-inline-formula\"><span id=\"MathJax-Element-18-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-101\" class=\"math\"><span id=\"MathJax-Span-102\" class=\"mrow\"><span id=\"MathJax-Span-103\" class=\"mstyle\"><span id=\"MathJax-Span-104\" class=\"mrow\"><span id=\"MathJax-Span-105\" class=\"mfrac\"><span id=\"MathJax-Span-106\" class=\"mn\">1<\/span><span id=\"MathJax-Span-107\" class=\"mn\">3<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>-magnetization steps in the magnetic hysteresis loop.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Mark S. Senn, Simon A. J. Kimber, Angel M. Arevalo Lopez, Adrian H. Hill, and J. Paul Attfield, Physical Review B 87 (13), 134402 The magnetic and crystal structures of<br \/><a href=\"https:\/\/senngroup.com\/spin-orders-and-lattice-distortions-of-geometrically-frustrated-6h\/\" class=\"more\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":8088,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[64],"tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Spin orders and lattice distortions of geometrically frustrated 6H-perovskites Ba3B\u2032Ru2O9 (B\u2032\u2009=\u2009La3+, Nd3+, and Y3+) - SENN GROUP<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/senngroup.com\/spin-orders-and-lattice-distortions-of-geometrically-frustrated-6h\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Spin orders and lattice distortions of geometrically frustrated 6H-perovskites Ba3B\u2032Ru2O9 (B\u2032\u2009=\u2009La3+, Nd3+, and Y3+) - SENN GROUP\" \/>\n<meta property=\"og:description\" content=\"Mark S. 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