Abstract
We present the synthesis and a detailed investigation of structural and magnetic properties of polycrystalline Ba(TiO) Cu4(PO4)4 (BTCPO) via X-ray diffraction, magnetic susceptibility, heat capacity, and 31P Nuclear Magnetic Resonance (NMR) measurements. BTCPO has a 2D layered structure with interlinked Cu4O12 tetramer units. A broad maximum is observed around 16.5 K in our magnetization data accompanied by a sharp anomaly around T = 9.5 K in the heat capacity. An anomaly at about T = 10 K is also found in the temperature dependence of the 31P NMR spin-lattice relaxation rate 1/T1. A power law behavior for the heat capacity as well as for the 31P 1/T1 below the ordering temperature could be obtained. The 31P NMR lineshape is asymmetric and the NMR shift tracks the bulk spin-susceptibility. We estimated the isotropic and axial components of the hyperfine coupling tensor to be as the Ahfiso⋍6794Oe/μB and Ahfax⋍818Oe/μB, respectively.
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