Long range ordered, dimerized, large-D and Haldane phases in spin 1 chain compounds

The magnetic properties of MAl4(OH)12SO4·3H2O with M = Co2+, Ni2+, and Cu2+determined by a combined experimental and computational approach

“…Again, the J value is about an order of magnitude smaller than reported for other inorganic spin chains with Ni 2+ . 50,51 By comparison, the hydrotalcite NiAl-LDH orders ferromagnetically at low temperature with the coupling mediated via 901 Ni-O(H)-Ni magnetization exchange pathways, 4 although no numerical values of the magnetic couplings have been reported to our knowledge. For NiAl 4 -LDH, such a magnetization pathway involves four bonds (Ni-O(H)-Al-O(H)-Ni) leading to a very weak magnetic interactions as compared to the hydrotalcite LDH, and no magnetic ordering is observed down to 2 K.…”

Quasi-1D XY antiferromagnet Sr2Ni(SeO3)2Cl2 at Sakai-Takahashi phase diagram

“…2 National University of Science and Technology "MISiS", Moscow, Russia 119049. 3 Ural Federal University, Ekaterinburg, Russia 620002. 4 Institute of Metal Physics, RAS, Ekaterinburg, Russia 620990.…”

“…Among the basic concepts stimulating research on strongly correlated electron systems is the Haldane conjecture of a gapped spin liquid implemented in the uniform chains of Heisenberg integer spins 1,2 . Tens of compounds, both organic and inorganic, have been studied to verify this idea and some of them have been identified as belonging to the Haldane sector of the Sakai-Takahashi phase diagram 3 . This representation takes into account the ratios between interchain J′ and intrachain J exchange interactions and uniaxial D single-ion anisotropy 4 .…”

Commensurate helicoidal order in the triangular layered magnet Na2MnTeO6

“…Triangular magnetic systems are subject to magnetic frustration stemming from the competition of mutually exclusive couplings [2]. In spin S = 1/2 or 1 magnets, this frustration often leads to liquidlike behavior at low temperatures [3][4][5]. Large spin S = 3/2 or 5/2 systems lift the frustration by the formation of the long-range ordered magnetic structures.…”