Frustrated square lattice with spatial anisotropy: Crystal structure and magnetic properties of PbZnVO(PO4)2

Alexander A. Tsirlin, Ramesh Nath, Artem M. Abakumov, Roman V. Shpanchenko, Christoph Geibel, and Helge Rosner
Phys. Rev. B 81, 174424 – Published 25 May 2010

Abstract

Crystal structure and magnetic properties of the layered vanadium phosphate PbZnVO(PO4)2 are studied using x-ray powder diffraction, magnetization and specific-heat measurements, as well as band-structure calculations. The compound resembles AAVO(PO4)2 vanadium phosphates and fits to the extended frustrated square-lattice model with the couplings J1,J1 between nearest neighbors and J2,J2 between next-nearest neighbors. The temperature dependence of the magnetization yields estimates of averaged nearest-neighbor and next-nearest-neighbor couplings, J¯15.2K and J¯210.0K, respectively. The effective frustration ratio α=J¯2/J¯1 amounts to 1.9 and suggests columnar antiferromagnetic ordering in PbZnVO(PO4)2. Specific-heat data support the estimates of J¯1 and J¯2 and indicate a likely magnetic ordering transition at 3.9 K. However, the averaged couplings underestimate the saturation field, thus pointing to the spatial anisotropy of the nearest-neighbor interactions. Band-structure calculations confirm the identification of ferromagnetic J1,J1 and antiferromagnetic J2,J2 in PbZnVO(PO4)2 and yield (J1J1)1.1K in excellent agreement with the experimental value of 1.1 K, deduced from the difference between the expected and experimentally measured saturation fields. Based on the comparison of layered vanadium phosphates with different metal cations, we show that a moderate spatial anisotropy of the frustrated square lattice has minor influence on the thermodynamic properties of the model. We discuss relevant geometrical parameters, controlling the exchange interactions in these compounds and propose a strategy for further design of strongly frustrated square-lattice materials.

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  • Received 12 October 2009

DOI:https://doi.org/10.1103/PhysRevB.81.174424

©2010 American Physical Society

Authors & Affiliations

Alexander A. Tsirlin1,2,*, Ramesh Nath1,†, Artem M. Abakumov2,3, Roman V. Shpanchenko2, Christoph Geibel1, and Helge Rosner1,‡

  • 1Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany
  • 2Department of Chemistry, Moscow State University, 119991 Moscow, Russia
  • 3EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium

  • *altsirlin@gmail.com
  • Present address: Indian Institute of Science Education and Research, Trivandrum 695016, Kerala, India.
  • helge.rosner@cpfs.mpg.de

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Issue

Vol. 81, Iss. 17 — 1 May 2010

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