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

Abstract

Uniform quasi-one-dimensional integer spin compounds are of interest as a potential realization of the Haldane conjecture of a gapped spin liquid. This phase, however, has to compete with magnetic anisotropy and long-range ordered phases, the implementation of which depends on the ratio of interchain J′ and intrachain J exchange interactions and both uniaxial D and rhombic E single-ion anisotropies. Strontium nickel selenite chloride, Sr2Ni(SeO3)2Cl2, is a spin-1 chain system which passes through a correlations regime at Tmax ~ 12 K to long-range order at TN = 6 K. Under external magnetic field it experiences the sequence of spin-flop at Bc1 = 9.0 T and spin-flip transitions Bc2 = 23.7 T prior to full saturation at Bsat = 31.0 T. Density functional theory provides values of the main exchange interactions and uniaxial anisotropy which corroborate the experimental findings. The values of J′/J = 0.083 and D/J = 0.357 place this compound into a hitherto unoccupied sector of the Sakai-Takahashi phase diagram.

Analogous Chain Selenite Chlorides Ba2M(SeO3)2Cl2 (M = Cu2+, Ni2+, Co2+, Mn2+) and Pb2Cu(SeO3)2Cl2 with Tunable Spin S: Syntheses and Characterizations

“…Particularly for compounds 3 and 4 , two magnetic orbitals of d z 2 and d xy perpendicular to the chain direction may favor stronger interchain interactions, compared to 2 with only one magnetic orbital of d z 2 , leading to pure 3D LRO without the sign of 1D magnetism in 3 and 4 . This is also confirmed in the Sr 2 Ni(SeO 3 ) 2 Cl 2 , showing both 1D magnetism and LRO . While attributed to negligible interchain interaction originating from no magnetic orbital perpendicular to the chain direction, compounds 1 and 5 with stronger quantum fluctuations show pure 1D magnetism with no LRO down to 2 K. These are confirmed by the combined experimental results of the susceptibility, field dependent magnetization, heat capacity, and ESR of 1 – 5 .…”

“…This is also confirmed in the Sr 2 Ni(SeO 3 ) 2 Cl 2 , showing both 1D magnetism and LRO. 49 While attributed to negligible interchain interaction originating from no magnetic orbital perpendicular to the chain direction, compounds 1 and 5 with stronger quantum fluctuations show pure 1D magnetism with no LRO down to 2 K. These are confirmed by the combined experimental results of the susceptibility, field dependent magnetization, heat capacity, and ESR of 1−5. Thus, despite compounds 1−4 being isostructural, with the increase of spin S from S = 1/2 to S = 5/2, the occurrence of three-dimensional LRO becomes easier and the system with larger spin is more classical.…”

“…Among them, the [SeO 3 ] 2– anion group with a stereochemically active lone electron pair can contribute to the design and synthesis of a large number of diverse novel compounds and provide a rich structural chemistry, particularly for the incorporation with halogen ions forming different anion groups by partial substitution of oxygen atoms. Experimentally, several magnetic selenide halides have been reported, such as Cu 3 Yb(SeO 3 ) 2 O 2 Cl 2 , Cu 3 Bi(SeO 3 ) 2 O 2 X (X = Br, Cl), KCu 5 O 2 (SeO 3 ) 2 Cl 3 , Pb 2 FeCu(SeO 3 ) 4 (H 2 O)Cl, CdCu 2 (SeO 3 ) 2 Cl 2 , , Sr 2 M(SeO 3 ) 2 Cl 2 (M = Cu, Ni, Co), − and Pb 2 Cu 10 O 4 (SeO 3 ) 4 Cl 7 …”

Diverse Magnetic Chains in Inorganic Compounds

“…The results for Coulomb parameter U = 3 and 4 eV in a presumption of Δ = 0.41J 1 are summarized in Table 1. In accordance with Sakai-Takahashi phase diagram, 27 NH 4 VPO 4 OH falls into the Haldane sector with the ratio of interchain 2(J 2 + J 3 ) exchange to intrachain J 1 exchange equal to 0.0420. Note, the limiting values of this ratio for the square and honeycomb nonfrustrated lattices are 0.0648 and 0.0687, respectively.…”

Magnetic Ordering and Interplay between the Magnetic and Charge Subsystems in New Francisite‐Analog Cu3Dy(SeO3)2O2Cl as Studied by the Spectroscopy of Kramers Doublets

“…Magnetic ions in these compounds are distributed anisotropically and form various groups, such as dimers (0D), chains or ladders (1D), or planes (2D). [1][2][3][4][5] Among such selenites, a big family of francisite-like compounds was synthesized not so long ago. [3,4] The parent compound, namely, the mineral francisite Cu 3 Bi(SeO 3 ) 2 O 2 Cl, shows interesting magnetic behavior.…”