Successive spin-flop transitions of a Néel-type antiferromagnetLi2MnO3single crystal with a honeycomb lattice

Abstract

PACS titles: Spin arrangements in magnetically ordered materials, Exchange and superexchange interactions, Magnetic phase boundaries including meta-magnetism. AbstractWe have carried out high magnetic field studies of single-crystalline Li 2 MnO 3 , a honeycomb lattice antiferromagnet. Its magnetic phase diagram was mapped out using magnetization measurements at applied fields up to 35 T. Our results show that it undergoes two successive meta-magnetic transitions around 9 T fields applied perpendicular to the ab-plane (along the c*-axis). These phase transitions are completely absent in the magnetization measured with field applied along the ab-plane. In order to understand this magnetic phase diagram, we developed a mean-field model starting from the correct Néel-type magnetic structure, consistent with our single crystal neutron diffraction data at zero field. Our model calculations succeeded in explaining the two meta-magnetic transitions that arise when Li 2 MnO 3 enters two different spinflop phases from the zero field Néel phase.

High-field magnetization and electronic spin resonance study in the twisted honeycomb lattice α-Mn2V2O7

“…It confirms the above prediction of zig-zag Mn 2+ ion chain for the system due to the special J 1 , J 2 and J 3 interactions of the distorted honeycomb layers [15,16]. It is worth mentioning that multiple field induced spin-flop transitions can happen when a magnetic system has multiple sublattices or exists multiple sites with different coordination, such as honeycomb lattice Li 2 MnO 3 [45], quasi-1D chain BaCu 2 Si 2 O 7 [46], and antiferromagnet Co 2 Mo 3 O 8 [47]. But the underlying mechanism of spin flop is still unclear.…”

Robust singlet dimers with fragile ordering in two-dimensional honeycomb lattice of Li2RuO3

“…Unfortunately, however, different magnetic ordered states were found in real materials: a zigzag-type ordering in Na 2 IrO 3 9 and an incommensurate magnetic ordering in γ-Li 2 IrO 3 10. We note that other types of magnetic ordering were also found in related compounds with similar structures: Li 2 MnO 3 1112 and Li 2 RhO 3 13. However, at least in one system of this class, Li 2 RuO 3 , the situation is drastically different.…”

Experimental percolation studies of two-dimensional honeycomb lattice: Li2Mn1–xTixO3

“…Thus it will be very useful to measure J 1 and J 2 from inelastic neutron scattering of Li 2 MnO 3 and compare it with Bi 3 Mn 4 O 12 (NO 3 ). Our latest analysis based on a mean-field model of high-field data [23] suggests that the J 2 /J 1 ratio is significantly reduced to 0.025 for Li 2 MnO 3 .…”

“…8 (NO 3 ). Our latest analysis based on a mean-field model of high-field data [23] suggests that the J 2 /J 1 ratio is significantly reduced to 0.025 for Li 2 MnO 3 . Thus it is an intriguing question how the small difference in the Mn-Mn distances leads to such a large change in J 2 /J 1 for the two samples.…”