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arxiv: cond-mat/0512721 · v1 · submitted 2005-12-30 · ❄️ cond-mat.mtrl-sci · cond-mat.str-el

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

Raivo Stern , Ivo Heinmaa , Annika Kriisa , Enno Joon , Sirje Vija , Jeffrey Clayhold , Mutlu Kartin-Ulutagay , Xunhua Mo
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Wendy Queen Shiou-Jyh Hwu
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classification ❄️ cond-mat.mtrl-sci cond-mat.str-el
keywords magneticphaseaso4na5rbcu4nucleartransitiontwo-dimensionalafmorder
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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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