Two-dimensional tetramer-cuprate Na5RbCu4(AsO4)4Cl2: phase transitions and AFMorder as seen by 87Rb NMR

Stern, Raivo; Heinmaa, Ivo; Kriisa, Annika; Joon, Enno; Vija, Sirje; Clayhold, Jeffrey; Kartin-Ulutagay, Mutlu; Mo, Xunhua; Queen, Wendy; Hwu, Shiou-Jyh

doi:10.1016/j.physb.2006.01.523

arXiv 2005-12-30 DOI 10.1016/j.physb.2006.01.523 0 مشاهدة

Two-dimensional tetramer-cuprate Na5RbCu4(AsO4)4Cl2: phase transitions and AFMorder as seen by 87Rb NMR

Stern, Raivo · Heinmaa, Ivo · Kriisa, Annika · Joon, Enno · Vija, Sirje · Clayhold, Jeffrey · Kartin-Ulutagay, Mutlu · Mo, Xunhua · Queen, Wendy · Hwu, Shiou-Jyh

Materials Science Strongly Correlated Electrons

الأصل · EN

We report the Rb nuclear magnetic resonance (NMR) results in a recently synthesized Na5RbCu4(AsO4)Cl2. This complex novel two-dimensional (2D) cuprate is an unique magnetic material, which contains layers of coupled Cu4O4 tetramers. In zero applied magnetic field, it orders antiferromagnetically via a second-order low-entropy phase transition at TN = 15(1) K. We characterise the ordered state by 87Rb NMR, and suggest for it a noncollinear rather than collinear arrangement of spins. We discuss the properties of Rb nuclear site and point out the new structural phase transition(s) around 74 K and 110 K.

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