Two dimensional magnetic correlation in the unconventional corrugated layered oxides (Ba,Sr)₄Mn₃O₁₀

Abstract

Both Ba4Mn3O10 and Sr4Mn3O10 crystallize in an orthorhombic crystal structure consisting of corrugated layers containing Mn3O12 polydedra. The thermal variation of magnetic susceptibility of the compositions consists of a broad hump like feature indicating the presence of low dimensional magnetic correlation. We have systematically investigated the magnetic data of these compounds and found that the experimental results match quite well with the two dimensional Heisenberg model of spin-spin interaction. The two dimensional nature of the magnetic spin-spin interaction is supported by the low temperature heat capacity data of Ba4Mn3O10. Interestingly, both the samples show dielectric anomaly near the magnetic ordering temperature indicating multiferroic behavior.

The Synthesis of a Quasi-One-Dimensional Iron-Based Telluride with Antiferromagnetic Chains and a Spin Glass State

“…Besides the nonlinear relationship of 1/χ ∼ T , the susceptibility curve shows a hump with the maximum susceptibility at 190 K ( T max ) as the temperature decreases, followed by a sharp rise at low temperatures as shown in Figure a. Generally, the broad hump-like feature is indicative of low-dimensional short-range magnetic correlation, which should derive from the short-range antiferromagnetic correlation associated with the intrachain interaction ( J intra ) in the quasi-1D Ba 9 Fe 3 Te 15 ; this is similar to that in other quasi-1D systems, such as Ba 2 FeS 3 , Ba 2 CoS 3 , and Ba 2 MnS 3 , and two-dimensional systems, such as (Ba,Sr) 4 Mn 3 O 10 . The magnetic susceptibilities in the high-temperature region T > T max can be described according to the Wagner–Friedberg model.…”

“…Generally, the broad hump-like feature is indicative of lowdimensional short-range magnetic correlation, which should derive from the short-range antiferromagnetic correlation associated with the intrachain interaction (J intra ) in the quasi-1D Ba 9 Fe 3 Te 15 ; this is similar to that in other quasi-1D systems, 30 such as Ba 2 FeS 3 , Ba 2 CoS 3 , and Ba 2 MnS 3 , and twodimensional systems, such as (Ba,Sr) 4 Mn 3 O 10 . 31 The magnetic where T 0 = 2J intra S(S + 1), = − U x x ( ) coth( ) x 1 , g is the Landeć onstant, N is the Avogadro constant, S is the spin moment, and J intra is the intrachain interaction. 32,33 Here, J intra for the antiferromagnetic coupling is defined as negative.…”

A Nearly Ideal One-Dimensional S = 5/2 Antiferromagnet FeF3(4,4′-bpy) (4,4′-bpy =4,4′-bipyridyl) with Strong Intrachain Interactions

“…Upon temperature cooling (Figure S4), the χT starts to decrease even from 350 K, thereby reinforcing the interpretation that the AFM intrachain interaction is strong. The temperature-dependent magnetic susceptibility was fitted by a Fisher classical model of χ = [ Ng 2 μ B 2 S ( S + 1)/3 k B T ]·[(1 + u )/(1 – u )], where g = 2, S = 5/2, u = coth­[2 JS ( S + 1)/ k B T ] – k B T /2 JS ( S + 1), and J is defined negative for AFM coupling from the Hamiltonian H = −2 J ∑ S i S i +1 . , As shown in Figure , the best fit to the experimental data between 50 and 350 K gave J / k B = −19.2(1) K, which is close to −16.6 K simply estimated from a relation T (χ max )/(| J |/ k B ) = 1.12 S ( S + 1) + 0.10 . The agreement between experimental and theoretical curves is reasonably good, particularly at high temperatures.…”

Ba4RuMn2O10: A Noncentrosymmetric Polar Crystal Structure with Disordered Trimers

“…The obtained γ (21 mJ/(mol·K 2 )) is comparable with the value obtained in the related compound Ba 4 Ir 3 O 10 , which also lacks the long-range magnetic order but shows strong AFM exchange interactions . The coefficient β is associated with the Debye temperature (Θ D ) as Θ D 3 = 12π 4 Rn /(5β), where R = 8.314 J/(mol·K), n = 17 (the number of atoms per formula unit), and the Θ D is determined to be 180 K, which is smaller than that (400 K) of Ba 4 Mn 3 O 10 …”