Magnetic Transitions in the Chiral Armchair-Kagome System Mn\(_2\)Sb\(_2\)O\(_7\)
The competition between interactions in frustrated magnets allows a wide variety of new ground states, often exhibiting emergent physics and unique excitations. Expanding the suite of lattices available for study enhances our chances of finding exotic physics. Mn\(_2\)Sb\(_2\)O\(_7\) forms in a chir...
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| creator | Peets, Darren C Sim, Hasung Choi, Seongil Avdeev, Maxim Lee, Seongsu Kim, Su Jae Kang, Hoju Ahn, Docheon Park, Je-Geun |
| description | The competition between interactions in frustrated magnets allows a wide variety of new ground states, often exhibiting emergent physics and unique excitations. Expanding the suite of lattices available for study enhances our chances of finding exotic physics. Mn\(_2\)Sb\(_2\)O\(_7\) forms in a chiral, kagome-based structure in which a fourth member is added to the kagome-plane triangles to form an armchair unit and link adjacent kagome planes. This structural motif may be viewed as intermediate between the triangles of the kagome network and the tetrahedra in the pyrochlore lattice. Mn\(_2\)Sb\(_2\)O\(_7\) exhibits two distinct magnetic phase transitions, at 11.1 and 14.2K, at least one of which has a weak ferromagnetic component. The magnetic propagation vector does not change through the lower transition, suggesting a metamagnetic transition or a transition involving a multi-component order parameter. Although previously reported in the \(P3_121\) space group, Mn\(_2\)Sb\(_2\)O\(_7\) actually crystallizes in \(P2\), which allows ferroelectricity, and we show clear evidence of magnetoelectric coupling indicative of multiferroic order. The quasi-two-dimensional `armchair-kagome' lattice presents a promising platform for probing chiral magnetism and the effect of dimensionality in highly frustrated systems. |
| doi_str_mv | 10.48550/arxiv.1611.02372 |
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Expanding the suite of lattices available for study enhances our chances of finding exotic physics. Mn\(_2\)Sb\(_2\)O\(_7\) forms in a chiral, kagome-based structure in which a fourth member is added to the kagome-plane triangles to form an armchair unit and link adjacent kagome planes. This structural motif may be viewed as intermediate between the triangles of the kagome network and the tetrahedra in the pyrochlore lattice. Mn\(_2\)Sb\(_2\)O\(_7\) exhibits two distinct magnetic phase transitions, at 11.1 and 14.2K, at least one of which has a weak ferromagnetic component. The magnetic propagation vector does not change through the lower transition, suggesting a metamagnetic transition or a transition involving a multi-component order parameter. Although previously reported in the \(P3_121\) space group, Mn\(_2\)Sb\(_2\)O\(_7\) actually crystallizes in \(P2\), which allows ferroelectricity, and we show clear evidence of magnetoelectric coupling indicative of multiferroic order. 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| subjects | Antimony Ferroelectricity Ferromagnetism Lattices Magnetic transitions Magnetism Magnets Manganese Order parameters Phase transitions Tetrahedra Triangles |
| title | Magnetic Transitions in the Chiral Armchair-Kagome System Mn\(_2\)Sb\(_2\)O\(_7\) |
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