Strong frustration due to competing ferromagnetic and antiferromagnetic interactions: Magnetic properties of M(VO)2(PO4)2 (M=Ca and Sr)

R. Nath, A. A. Tsirlin, E. E. Kaul, M. Baenitz, N. Büttgen, C. Geibel, and H. Rosner
Phys. Rev. B 78, 024418 – Published 18 July 2008


We present a detailed investigation of the magnetic properties of complex vanadium phosphates M(VO)2(PO4)2 (M=Ca and Sr) by means of magnetization, specific heat, P31 NMR measurements, and band-structure calculations. Experimental data evidence the presence of ferromagnetic and antiferromagnetic interactions in M(VO)2(PO4)2, resulting in a nearly vanishing Curie-Weiss temperature θCW1K that contrasts with the maximum of magnetic susceptibility at 3 K. Specific heat and NMR measurements also reveal weak exchange couplings with the thermodynamic energy scale Jc=1015K. Additionally, the reduced maximum of the magnetic specific heat indicates strong frustration of the spin system. Band-structure calculations show that the spin systems of the M(VO)2(PO4)2 compounds are essentially three-dimensional with the frustration caused by competing ferromagnetic and antiferromagnetic interactions. Both calcium and strontium compounds undergo antiferromagnetic long-range ordering at TN=1.5 and 1.9 K, respectively. The spin model reveals an unusual example of controllable frustration in three-dimensional magnetic systems.

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  • Received 29 April 2008


©2008 American Physical Society

Authors & Affiliations

R. Nath1,*, A. A. Tsirlin1,2,†, E. E. Kaul1,‡, M. Baenitz1, N. Büttgen3, C. Geibel1, and H. Rosner1

  • 1Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Strasse 40, 01187 Dresden, Germany
  • 2Department of Chemistry, Moscow State University, 119992 Moscow, Russia
  • 3Experimentalphysik V, Elektronische Korrelationen und Magnetismus, University of Augsburg, D-86135 Augsburg, Germany

  • *
  • Present address: Low Temperature Group, Bariloche Atomic Centre—National Commission of Atomic Energy, Av. Bustillo 9500 (C. P. 8400) S. C. de Bariloche, Argentina.

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Vol. 78, Iss. 2 — 1 July 2008

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