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

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • O. Mustonen
  • S. Vasala
  • E. Sadrollahi
  • K. P. Schmidt
  • C. Baines
  • H. C. Walker
  • I. Terasaki
  • F. J. Litterst
  • E. Baggio-Saitovitch
  • Maarit Karppinen

Research units

  • Brazilian Center for Research in Physics
  • Technical University of Braunschweig
  • Paul Scherrer Institute
  • Rutherford Appleton Laboratory
  • Nagoya University

Abstract

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 Sr2Cu(Te0.5W0.5)O6, where the isostructural end phases Sr2CuTeO6 and Sr2CuWO6 are Néel and columnar type antiferromagnets, respectively. We show that magnetism in Sr2Cu(Te0.5W0.5)O6 is entirely dynamic down to 19 mK. Additionally, we observe at low temperatures for Sr2Cu(Te0.5W0.5)O6 - 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 Sr2Cu(Te0.5W0.5)O6 highlight the role of disorder in addition to magnetic frustration in spin liquid physics.

Details

Original languageEnglish
Article number1085
JournalNature Communications
Volume9
Issue number1
Publication statusPublished - 1 Dec 2018
MoE publication typeA1 Journal article-refereed

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