Synthesis, structure, and properties of Ba₉Co₃Se₁₅ with one-dimensional spin chains*

Abstract

A new compound with one-dimensional spin chains, Ba9Co3Se15, was synthesized under high pressure and high temperature conditions and systematically characterized via structural, transport and magnetic measurements. Ba9Co3Se15 crystallizes in a hexagonal structure with the space group P-6c2 (No. 188) and lattice constants of a = b = 9.6765 Å and c = 18.9562 Å. The structure consists of trimeric face-sharing octahedral CoSe6 chains, which are arranged in a triangular lattice in the ab-plane and separated by Ba atoms. The distance of the nearest neighbor of CoSe6 chains is very large, given by the lattice constant a = 9.6765 Å. The Weiss temperature Tθ associated with the intra-chain coupling strength is about −346 K. However, no long-range magnetic order but a spin glass transition at ∼ 3 K has been observed. Our results indicate that the spin glass behavior in Ba9Co3Se15 mainly arises from the magnetic frustration due to the geometrically frustrated triangular lattice.

A Ferrotoroidic Candidate with Well‐Separated Spin Chains

“…[19,20] To look for such a 1D ferrotoroidic chain in a quasi 1D system, we turn to the Hf 5 Sn 3 Cuanti type ternary compounds A 3 BX 5 (A denotes the alkali earth metal, B the transition metal, and X the chalcogen), which have been intensively studied due to their strong 1D structural characteristic. [21][22][23][24][25] In the present work, we successfully synthesized the new compound Ba 6 Cr 2 S 10 under high-pressure and high-temperature conditions. It possesses dimerized face-sharing CrS 6 octahedral chains that are separated by 9.1228 Å. Ba 6 Cr 2 S 10 undergoes an AFM-like transition at ≈10 K. Due to the dimerized characteristic, the AFMlike spin chains in Ba 6 Cr 2 S 10 are exactly the theoretically proposed model of spin chains.…”

High-Pressure Synthesis and Physical Properties of a Spinel Compound FeAl2S4

“…In general, the value of the frustration parameter f of larger than 5∼10 is considered as empirical evidence of a highly frustrated magnet. 21,22 Here, the value of f for FeAl 2 S 4 can be calculated to be 10.2, indicating that there exists strong frustration in the spinel compound.…”

“…Figure b presents the isothermal magnetization at 2 and 300 K. The magnetization at 300 K is linearly dependent on the magnetic field, suggesting a paramagnetic behavior, while the isothermal magnetization at 2 K displays little magnetic hysteresis but non-saturated magnetization behavior, which also is a common phenomenon in the spin glass systems. , In addition, the frustration parameter f is defined as the radio of the Weiss temperature T θ to the long-range magnetic ordering or spin glass temperature. In general, the value of the frustration parameter f of larger than 5∼10 is considered as empirical evidence of a highly frustrated magnet. , Here, the value of f for FeAl 2 S 4 can be calculated to be 10.2, indicating that there exists strong frustration in the spinel compound.…”

“…To characterize the spin glass, the coefficient K = Δ T f /( T f Δlog f ) can be used to quantify the response of susceptibility in the frequency, as shown in Figure b. Here, for FeAl 2 S 4 , the value of K , calculated to be 4.6 × 10 –2 , lies in the range of 5 × 10 –3 to 8 × 10 –2 for a typical spin glass system. , …”

High-pressure synthesis, crystal structure, and properties of iron-based spin-chain compound Ba9Fe3Se15

“…Using high-pressure method we have synthesized several new hexagonal Hf 5 Sn 3 Cu-anti type materials with a general formula of A 3 BX 5 , where the face-sharing BX 6 octahedral chains are separated by a large distance more than 9 Å, exhibiting a strong 1D structure characteristic [10][11][12][13][14][15] , . Among these quasi 1D materials, the iron telluride Ba 9 Fe 3 Te 15 with FeTe 6 octahedral chains was reported to display a 1D antiferromagnetic behavior [15] and show pressure-induced SC with a maximum T c ~4.7 K [16].…”