The spin-1/2 coupled tetramer system Ba(TiO) Cu4(PO4)4 probed by magnetization, 
specific heat, and31P NMR

Kumar, Vinod; Shahee, Aga; Kundu, S.; Baenitz, M.; Mahajan, A.V.

doi:10.1016/j.jmmm.2019.165600

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The spin-1/2 coupled tetramer system Ba(TiO) Cu₄(PO₄)₄ probed by magnetization, specific heat, and ³¹P NMR

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Baenitz, M.
Michael Baenitz, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Kumar, V., Shahee, A., Kundu, S., Baenitz, M., & Mahajan, A. (2019). The spin-1/2 coupled tetramer system Ba(TiO) Cu₄(PO₄)₄ probed by magnetization, specific heat, and ³¹P NMR. Journal of Magnetism and Magnetic Materials, 492: 165600, pp. 1-7. doi:10.1016/j.jmmm.2019.165600.

Cite as: https://hdl.handle.net/21.11116/0000-0004-84D5-6

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.