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Stabilization of the tetragonal structure inPuphal, Pascal; Sheptyakov, Denis; van Well, Natalija; Postulka, Lars; Heinmaa, Ivo; Ritter, Franz; Assmus, Wolf; Wolf, Bernd; Lang, Michael; Jeschke, Harald O.; Valentí, Roser; Stern, Raivo; Rüegg, Christian; Krellner, Cornelius · Physical Review B · 2016