R Nath et al 2006 J. Phys.: Condens. Matter 18 4285 doi:10.1088/0953-8984/18/17/015
31P NMR study of Na2CuP2O7: an S = 1/2 two dimensional Heisenberg antiferromagnetic system
R Nath1, A V Mahajan1, N Büttgen2, C Kegler2, J Hemberger2 and A Loidl2
Show affiliationsThe magnetic properties of Na2CuP2O7 were investigated by means of 31P nuclear magnetic resonance (NMR), magnetic susceptibility, and heat capacity measurements. We report the 31P NMR shift, the spin–lattice 
, and spin–spin (1/T2) relaxation rate data as a function of temperature T. The temperature dependence of the NMR shift K(T) is well described by the S = 1/2 square lattice Heisenberg antiferromagnetic model with an intraplanar exchange of 
K and a hyperfine coupling A = 3533 ± 185 Oe /μB. The 31P NMR spectrum was found to broaden abruptly below T~10 K, signifying some kind of transition. However, no anomaly was noticed in the bulk susceptibility data down to 1.8 K. The heat capacity appears to have a weak maximum around 10 K. With decrease in temperature, the spin–lattice relaxation rate 1/T1 decreases monotonically and appears to agree well with the high temperature series expansion expression for a S = 1/2 2D square lattice.
- PACS
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75.30.Et Exchange and superexchange interactions
75.10.Jm Quantized spin models
- Subjects
- Dates
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Issue 17 (3 May 2006)
Received 31 January 2006
Published 13 April 2006
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31P NMR study of Na2CuP2O7: an S = 1/2 two dimensional Heisenberg antiferromagnetic system
R Nath et al 2006 J. Phys.: Condens. Matter 18 4285
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-
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-
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-
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-
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-
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