Exploring the spin-12 frustrated square lattice model with high-field magnetization studies

Alexander A. Tsirlin, Burkhard Schmidt, Yurii Skourski, Ramesh Nath, Christoph Geibel, and Helge Rosner
Phys. Rev. B 80, 132407 – Published 26 October 2009

Abstract

We report on high-field magnetization measurements for a number of layered vanadium phosphates that were recently recognized as spin-12 frustrated square lattice compounds with ferromagnetic nearest-neighbor couplings (J1) and antiferromagnetic next-nearest-neighbor couplings (J2). The saturation fields of the materials lie in the range from 4 to 24 T and show excellent agreement with the previous estimates of the exchange couplings deduced from low-field thermodynamic measurements. The consistency of the high-field data with the regular frustrated square lattice model provides experimental evidence for a weak impact of spatial anisotropy on the nearest-neighbor couplings in layered vanadium phosphates. The variation in the J2/J1 ratio within the compound family facilitates the experimental access to the evolution of the magnetization curve upon the change in the frustration magnitude. Our results support the recent theoretical prediction by Thalmeier et al. [Phys. Rev. B 77, 104441 (2008)] and give evidence for the enhanced bending of the magnetization curves due to the increasing frustration of the underlying spin system.

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  • Received 2 July 2009

DOI:https://doi.org/10.1103/PhysRevB.80.132407

©2009 American Physical Society

Authors & Affiliations

Alexander A. Tsirlin1,2,*, Burkhard Schmidt1, Yurii Skourski3, Ramesh Nath1,†, Christoph Geibel1, and Helge Rosner1,‡

  • 1Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany
  • 2Department of Chemistry, Moscow State University, 119991 Moscow, Russia
  • 3Dresden High Magnetic Field Laboratory, Forschungszentrum Dresden–Rossendorf, 01314 Dresden, Germany

  • *altsirlin@gmail.com
  • Present address: Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
  • helge.rosner@cpfs.mpg.de

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Issue

Vol. 80, Iss. 13 — 1 October 2009

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