Fluctuations and correlations in a frustrated S=12 square lattice with competing ferromagnetic and antiferromagnetic interactions studied by muon-spin relaxation

P. Carretta, M. Filibian, R. Nath, C. Geibel, and P. J. C. King
Phys. Rev. B 79, 224432 – Published 25 June 2009


Zero and longitudinal field μSR measurements in Pb2VO(PO4)2 and BaCdVO(PO4)2, two prototypes of the frustrated S=1/2 square lattice model with competing ferromagnetic and antiferromagnetic interactions, are presented. Both systems are observed to undergo a phase transition to a long-range magnetic order at TN3.46K, for Pb2VO(PO4)2, and at TN0.99K, for BaCdVO(PO4)2. In Pb2VO(PO4)2 both the temperature dependence of the order parameter and the longitudinal relaxation rate above TN are consistent with a two-dimensional XY model, as it is found for Sr2CuO2Cl2. On the other hand, for BaCdVO(PO4)2, which lies very close to the magnetically disordered region of the phase diagram where a bond-nematic order was predicted, a peculiar logarithmic increase in the relaxation is observed above TN. In both systems a rather broad distribution of internal fields at the muon sites is noticed below TN. The origin of this distribution is discussed in the light of the μSR experiments already performed on S=1/2 frustrated antiferromagnets on a square lattice.

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  • Received 13 March 2009


©2009 American Physical Society

Authors & Affiliations

P. Carretta1, M. Filibian1, R. Nath2,*, C. Geibel2, and P. J. C. King3

  • 1Dipartimento di Fisica “A. Volta,” University of Pavia–CNISM, I-27100 Pavia, Italy
  • 2Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
  • 3ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, United Kingdom

  • *Present address: Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.

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Vol. 79, Iss. 22 — 1 June 2009

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