Study of one-dimensional nature of (Sr,Ba)2Cu(PO4)2 and BaCuP2O7 via 31P NMR
R. Nath, A. V. Mahajan, N. Buttgen, C. Kegler, A. Loidl
Abstract
The magnetic behavior of the low-dimensional phosphates (Sr,Ba)2 Cu(PO4)2 and BaCuP2O7 was investigated by means of magnetic susceptibility and 31P nuclear magnetic resonance (NMR) measurements. We present here the NMR shift K(T), the spin-lattice 1/T1 and spin-spin 1/T2 relaxation-rate data over a wide temperature range 0.02 K < T < 300 K. The T-dependence of the NMR K(T) is well described by the S=1/2 Heisenberg antiferromagnetic chain model with an intrachain exchange of J/kB = 165 K, 151 K, and 108 K in Sr2Cu(PO4)2, Ba2Cu(PO4)2, and BaCuP2O7, respectively. Our measurements suggest the presence of magnetic ordering at 0.8 K in BaCuP2O7 (J/kB = 108 K). For all the samples, we find that 1/T1 is nearly T-independent at low-temperatures (1 K < T < 10 K), which is theoretically expected for 1D chains when relaxation is dominated by fluctuations of the staggered susceptibility. At high temperatures, 1/T1 varies nearly linearly with temperature.
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