Spin-liquid-like state in a spin-1/2 square-lattice antiferromagnet perovskite induced by d 10 -d 0 cation mixing.

Autor: Mustonen O; Department of Chemistry and Materials Science, Aalto University, FI-00076, Espoo, Finland., Vasala S; Centro Brasileiro de Pesquisas Físicas (CBPF), Rua Dr Xavier Sigaud 150, Urca, Rio de Janeiro, 22290-180, Brazil., Sadrollahi E; Institut für Physik der Kondensierten Materie, Technische Universität Braunschweig, 38110, Braunschweig, Germany., Schmidt KP; Institut für Physik der Kondensierten Materie, Technische Universität Braunschweig, 38110, Braunschweig, Germany., Baines C; Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland., Walker HC; ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, UK., Terasaki I; Department of Physics, Nagoya University, Nagoya, 464-8602, Japan., Litterst FJ; Centro Brasileiro de Pesquisas Físicas (CBPF), Rua Dr Xavier Sigaud 150, Urca, Rio de Janeiro, 22290-180, Brazil.; Institut für Physik der Kondensierten Materie, Technische Universität Braunschweig, 38110, Braunschweig, Germany., Baggio-Saitovitch E; Centro Brasileiro de Pesquisas Físicas (CBPF), Rua Dr Xavier Sigaud 150, Urca, Rio de Janeiro, 22290-180, Brazil., Karppinen M; Department of Chemistry and Materials Science, Aalto University, FI-00076, Espoo, Finland. maarit.karppinen@aalto.fi.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2018 Mar 14; Vol. 9 (1), pp. 1085. Date of Electronic Publication: 2018 Mar 14.
DOI: 10.1038/s41467-018-03435-1
Abstrakt: A quantum spin liquid state has long been predicted to arise in spin-1/2 Heisenberg square-lattice antiferromagnets at the boundary region between Néel (nearest-neighbor interaction dominates) and columnar (next-nearest-neighbor interaction dominates) antiferromagnetic order. However, there are no known compounds in this region. Here we use d 10 -d 0 cation mixing to tune the magnetic interactions on the square lattice while simultaneously introducing disorder. We find spin-liquid-like behavior in the double perovskite Sr 2 Cu(Te 0.5 W 0.5 )O 6 , where the isostructural end phases Sr 2 CuTeO 6 and Sr 2 CuWO 6 are Néel and columnar type antiferromagnets, respectively. We show that magnetism in Sr 2 Cu(Te 0.5 W 0.5 )O 6 is entirely dynamic down to 19 mK. Additionally, we observe at low temperatures for Sr 2 Cu(Te 0.5 W 0.5 )O 6 -similar to several spin liquid candidates-a plateau in muon spin relaxation rate and a strong T-linear dependence in specific heat. Our observations for Sr 2 Cu(Te 0.5 W 0.5 )O 6 highlight the role of disorder in addition to magnetic frustration in spin liquid physics.
Databáze: MEDLINE
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