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Magnetic properties of the RbMnPO4 zeolite-ABW type material: a frustrated zigzag spin chain | | G. Nénert
; J. L. Bettis, Jr.
; R. K. Kremer
; H. Ben Yahia
; C. Ritter
; E. Gaudin
; O. Isnard
; M.-H. Whangbo
; | | Date: |
7 Sep 2014 | | 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) {AA}, b =
5.43415(5) {AA}, c = 9.10250(8) {AA} and beta = 90.4209(6){deg}. 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). This suggests 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. | | Source: | arXiv, 1410.0344 | | Services: | Forum | Review | PDF | Favorites | |
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