Magnetic properties of the RbMnPO4 zeolite-ABW-type material: A frustrated zigzag spin chain

Gwilherm Nénert, Jerry Bettis, Reinhard Kremer, Hamdi Ben Yahia, Clemens Ritter, Etienne Gaudin, Olivier Isnard, Myung Hwan Whangbo

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Abstract

The crystal structure and magnetic properties of the RbMnPO4 zeolite-ABW-type material have been studied by temperature-dependent neutron powder diffraction, low-temperature magnetometry, and heat capacity measurements. RbMnPO4 represents a rare example of a weak ferromagnetic polar material, containing Mn2+ ions with TN = 4.7 K. The neutron powder diffraction pattern recorded at T = 10 K shows that the compound crystallizes in the chiral and polar monoclinic space group P21 (No. 4) with the unit cell parameters: a = 8.94635(9), b = 5.43415(5), and c = 9.10250(8) Å and β = 90.4209(6). A close inspection of the crystal structure of RbMnPO4 shows that this material presents two different types of zigzag chains running along the b axis. This is a unique feature among the zeolite-ABW-type materials exhibiting the P21 symmetry. At low temperature, RbMnPO4 exhibits a canted antiferromagnetic structure characterized by the propagation vector k1 = 0, resulting in the magnetic symmetry P21′. The magnetic moments lie mostly along the b axis with the ferromagnetic component being in the ac plane. Due to the geometrical frustration present in this system, an intermediate phase appears within the temperature range 4.7-5.1 K characterized by the propagation vector k2 = (kx, 0, kz) with kx/kz ≈ 2. This ratio is reminiscent of the multiferroic phase of the orthorhombic RMnO3 phases (R = rare earth), suggesting that RbMnPO4 could present some multiferroic properties at low temperature. Our density functional calculations confirm the presence of magnetic frustration, which explains this intermediate incommensurate phase. Taking into account the strongest magnetic interactions, we are able to reproduce the magnetic structure observed experimentally at low temperature.

Original languageEnglish
Pages (from-to)9627-9635
Number of pages9
JournalInorganic Chemistry
Volume52
Issue number16
DOIs
Publication statusPublished - 19 Aug 2013

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

Cite this

Nénert, G., Bettis, J., Kremer, R., Ben Yahia, H., Ritter, C., Gaudin, E., Isnard, O., & Whangbo, M. H. (2013). Magnetic properties of the RbMnPO4 zeolite-ABW-type material: A frustrated zigzag spin chain. Inorganic Chemistry, 52(16), 9627-9635. https://doi.org/10.1021/ic401408f