K Kodama et al 2005 J. Phys.: Condens. Matter 17 L61 doi:10.1088/0953-8984/17/4/L02
K Kodama1, S Miyahara2, M Takigawa1,7, M Horvatić3, C Berthier3,4, F Mila5, H Kageyama6 and Y Ueda1
Show affiliationsWe observed a field-induced staggered magnetization in the 2D frustrated dimer singlet spin system SrCu2(BO3)2 by 11B NMR, from which the magnitudes of the intradimer Dzyaloshinsky–Moriya interaction and the staggered g-tensor were determined. These anisotropic interactions cause singlet–triplet mixing and eliminate a quantum phase transition at the expected critical field Hc for gap closing. They provide a quantitative account for some puzzling phenomena such as the onset of a uniform magnetization below Hc and the persistence of the excitation gap above Hc. The gap was accurately determined from the activation energy of the nuclear relaxation rate.
75.30.Et Exchange and superexchange interactions
75.10.Jm Quantized spin models
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
Issue 4 (2 February 2005)
Received 22 November 2004, in final form 4 January 2005
Published 14 January 2005
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