Abstract
The magnetic properties of Na2CuP2O7 were investigated by means of 31P nuclear magnetic resonance (NMR), magnetic susceptibility, and heat capacity measurements. We reportthe 31P NMR shift, the spin–lattice , and spin–spin (1/T2) relaxation rate data as a function of temperatureT. The temperature dependence of the NMR shiftK(T) is welldescribed 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 belowT∼10 K,signifying some kind of transition. However, no anomaly was noticed in the bulk susceptibility data downto 1.8 K. The heat capacity appears to have a weak maximum around10 K. With decrease in temperature, the spin–lattice relaxation rate1/T1 decreases monotonically and appears to agree well with the high temperature series expansion expressionfor a S = 1/2 2D square lattice.
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