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Magnetic properties of BaCdVO(PO4)2: A strongly frustrated spin-12 square lattice close to the quantum critical regime

R. Nath, A. A. Tsirlin, H. Rosner, and C. Geibel
Phys. Rev. B 78, 064422 – Published 25 August 2008


We report magnetization and specific-heat measurements on polycrystalline samples of BaCdVO(PO4)2 and show that this compound is a S=1/2 frustrated square lattice with ferromagnetic nearest-neighbor (J1) and antiferromagnetic next-nearest-neighbor (J2) interactions. The coupling constants J13.6K and J23.2K are determined from a fitting of the susceptibility data and confirmed by an analysis of the saturation field (μ0Hs4.2T), the specific heat, and the magnetic entropy. BaCdVO(PO4)2 undergoes magnetic ordering at about 1 K, likely toward a columnar antiferromagnetic state. We find that BaCdVO(PO4)2 with the frustration ratio α=J2/J10.9 is closer to a critical (quantum spin liquid) region of the frustrated square lattice than any of the previously reported compounds. Positive curvature of the magnetization curve is observed in agreement with recent theoretical predictions for high-field properties of the frustrated square lattice close to the critical regime.

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  • Received 17 March 2008


©2008 American Physical Society

Authors & Affiliations

R. Nath1,*, A. A. Tsirlin1,2,†, H. Rosner1, and C. Geibel1

  • 1Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany
  • 2Department of Chemistry, Moscow State University, 119992 Moscow, Russia

  • *ramesh_phy2003@yahoo.com
  • altsirlin@gmail.com

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Vol. 78, Iss. 6 — 1 August 2008

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