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

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.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-84D5-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-98F7-A
Genre: Journal Article

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 Creators:
Kumar, Vinod1, Author
Shahee, Aga, Author
Kundu, S., Author
Baenitz, M.2, Author              
Mahajan, A.V., Author
Affiliations:
1External Organizations, ou_persistent22              
2Michael Baenitz, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863471              

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 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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Language(s): eng - English
 Dates: 2019-07-222019-07-22
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1016/j.jmmm.2019.165600
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Title: Journal of Magnetism and Magnetic Materials
  Other : Journal of Magnetism and Magnetic Materials: MMM
  Abbreviation : J. Magn. Magn. Mater.
Source Genre: Journal
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Publ. Info: Amsterdam : NH, Elsevier
Pages: - Volume / Issue: 492 Sequence Number: 165600 Start / End Page: 1 - 7 Identifier: ISSN: 0304-8853
CoNE: https://pure.mpg.de/cone/journals/resource/954925512464