P-31 NMR study of Na2CuP2O7: an S=1/2 two dimensional Heisenberg antiferromagnetic system

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P-31 NMR study of Na2CuP2O7: an S=1/2 two dimensional Heisenberg antiferromagnetic system

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Title: P-31 NMR study of Na2CuP2O7: an S=1/2 two dimensional Heisenberg antiferromagnetic system
Author: NATH, R; MAHAJAN, AV; BUTTGEN, N; KEGLER, C; HEMBERGER, J; LOIDL, A
Abstract: The magnetic properties of Na2CuP2O7 were investigated by means of P-31 nuclear magnetic resonance (NMR), magnetic susceptibility, and heat capacity measurements. We report the 31P NMR shift, the spin-lattice (1/T-1), and spin spin (1/T-2) 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 J/k(B) similar or equal to 18 +/- 2 K and a hyperfine coupling A = 3533 +/- 185 Oe/mu B. The P-31 NMR spectrum was found to broaden abruptly below T similar to 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/T-1 decreases monotonically and appears to agree well with the high temperature series expansion expression for a S = 1/2 2D square lattice.
URI: http://dx.doi.org/10.1088/0953-8984/18/17/015
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9165
http://hdl.handle.net/10054/9165
Date: 2006


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