. "2009-10-22+02:00"^^ . . "V r\u00E1mci \u0159e\u0161en\u00ED grantov\u00E9ho projektu byly p\u0159ipraveny a studov\u00E1ny Co a Mn perovskity a p\u0159\u00EDbuzn\u00E9 slou\u010Deniny. Byly provedeny studie jejich strukturn\u00EDch, magnetick\u00FDch a elektrick\u00FDch transportn\u00EDch vlastnost\u00ED v\u010Detn\u011B jejich teplotn\u00EDch z\u00E1vislost\u00ED. Byla v\u011Bnov\u00E1na po"@cs . "1"^^ . "1"^^ . . . . "0"^^ . "The cobaltites of the perovskite types form a class of materials with a sequence of phase transitions that are accompanied with a marked change of electric and thermal transport properties. The temperature range of these transitions includes low temperatures and also the technologically important region up to 500\u00B0C. The aim of the project is to investigate in detail the atomic-level origins of the physical phenomena in systems Ln1xAxCoO3 and Ln1 xA1+xCoO4 (Ln = La, Y, rare earths, A = alkali earths), eventually with Mn partial substitution for Co. The project involves technology of ceramic and single-crystal samples, their crystallographic and complex physical characterization. The character of the spin states in systems with Co3+/Co4+ ions will be determined by the nuclear magnetic resonance on 59Co nuclei, eventually 139La or 141Pr. The experiments will be complemented by ab-initio electronic structure calculations. Attention will be paid to the orbital degeneracy in the intermediate and"@en . "GA202/06/0051" . "Elektronov\u00E1 struktura a lok\u00E1ln\u00ED spinov\u00FD stav dopovan\u00FDch kobaltit\u016F" . " spin state" . . "Kobaltity perovskitov\u00E9ho typu tvo\u0159\u00ED t\u0159\u00EDdu materi\u00E1l\u016F vyzna\u010Duj\u00EDc\u00ED se posloupnost\u00ED f\u00E1zov\u00FDch transformac\u00ED, kter\u00E9 jsou doprov\u00E1zeny zna\u010Dnou zm\u011Bnou elektrick\u00FDch a tepeln\u011B transportn\u00EDch vlastnost\u00ED. Teplotn\u00ED rozsah t\u011Bchto transformac\u00ED zahrnuje n\u00EDzk\u00E9 teploty i aplika\u010Dn\u011B d\u016Fle\u017Eitou oblast do 500\u00B0C. C\u00EDlem p\u0159edkl\u00E1dan\u00E9ho projektu je detailn\u00ED prozkoum\u00E1n\u00ED atomov\u00E9 podstaty fyzik\u00E1ln\u00EDch jev\u016F v syst\u00E9mech Ln1xAxCoO3 a Ln1xA1+xCoO4 (Ln = La, Y, kovy vz\u00E1cn\u00FDch zemin, A = kovy alkalick\u00FDch zemin), p\u0159\u00EDpadn\u011B s \u010D\u00E1ste\u010Dnou substituc\u00ED Mn za Co. Projekt zahrnuje technologii keramick\u00FDch vzork\u016F a monokrystal\u016F, jejich krystalografickou a komplexn\u00ED fyzik\u00E1ln\u00ED charakterizaci. Charakter spinov\u00FDch stav\u016F v syst\u00E9mech s Co3+/Co4+ ionty bude ur\u010Dov\u00E1n pomoc\u00ED jadern\u00E9 magnetick\u00E9 rezonance na j\u00E1drech 59Co, pop\u0159. na 139La or 141Pr. Experimenty budou dopln\u011Bny ab-initio v\u00FDpo\u010Dty elektronov\u00FDch struktur. Pozornost bude v\u011Bnov\u00E1na orbit\u00E1ln\u00ED degeneraci ve st\u0159edn\u00EDm a vysok\u00E9m spinov\u00E9m stavu kobaltu a jej\u00EDmu odstran\u011Bn\u00ED v d\u016Fsledku Jahnova-Tellerova" . "Electronic structure and local spin states in doped cobaltites"@en . "2006-01-01+01:00"^^ . "2008-04-25+02:00"^^ . . . . . "transition metal oxides; spin state; nuclear magnetic resonance; electronic structure calculations"@en . "http://www.isvav.cz/projectDetail.do?rowId=GA202/06/0051"^^ . . "transition metal oxides" . . . . "2008-12-31+01:00"^^ . . . . "20"^^ . "20"^^ . "Cobalt and manganese perovskites and similar systems were prepared and studied within the scope of this grant project. Structural, magnetic and electrical transport properties of these compounds and their respective temperature dependences were investiga"@en . . " nuclear magnetic resonance" .