Incommensurate magnetism in 
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 and prospects for tunable frustration in a triangular lattice of pseudo-1D spin chains

Bhutani, Ankita; Behera, Piush; McAuliffe, Rebecca D.; Cao, Huibo; Huq, Ashfia; Kirkham, Melanie J.; Woods, Toby J.; Shoemaker, Daniel P.

doi:10.1103/physrevmaterials.3.064404

Cited by 7 publications

(10 citation statements)

References 39 publications

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“…As a result, these compounds form helimagnetic structures (Table 2). A similar situation is observed in the structure of K 2 MnS 2-x Se x (0 ≤ x ≤ 2), where the nearest chains are not shifted with respect to each other along the chain propagation direction, but the overall crystal packing results in a triangulated pattern of chains, thus causing magnetic frustration and helimagnetic structure for the entire series of solid solutions [11]. Interestingly, the propagation vector and, thus, the turn angle of the spin helix, remain the same, irrespective of the S/Se ratio in the sample.…”

Section: Discussionsupporting

confidence: 58%

“…Thus, (MeNH3)[MnCl3(H2O)2] and Cs[MnCl3(H2O)2] exhibit dering at 4.1 K [9] and 4.9 K [10], respectively. In K2MnS2 and K2MnSe2, with eve arranged chains, the TN value increases to 17 K, and the J1 value was estimated to b -14 K [11]. The spin frustration observed in these two structures leads to a helical m structure, with the moments being perpendicular to the chain propagation direct Helimagnetic ordering can be expected in other quasi-1D systems with the spin arrangement of Figure 1b.…”

Section: Introductionmentioning

confidence: 88%

“…In this vein, our attention was by MnBi2Se4, a chain antiferromagnet with TN = 15 K. The original report on the m properties of this material proposed a collinear AFM structure, with a possibility As the distance between the chains decreases, the J 2 exchange pathway begins to play a more notable role. Thus, ( , with even closer arranged chains, the T N value increases to 17 K, and the J 1 value was estimated to be above -14 K [11]. The spin frustration observed in these two structures leads to a helical magnetic structure, with the moments being perpendicular to the chain propagation direction.…”

Section: Introductionmentioning

confidence: 93%

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Helimagnetism in MnBi2Se4 Driven by Spin-Frustrating Interactions Between Antiferromagnetic Chains

et al. 2021

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We report the magnetic properties and magnetic structure determination for a linear-chain antiferromagnet, MnBi2Se4. The crystal structure of this material contains chains of edge-sharing MnSe6 octahedra separated by Bi atoms. The magnetic behavior is dominated by intrachain antiferromagnetic (AFM) interactions, as demonstrated by the negative Weiss constant of −74 K obtained by the Curie–Weiss fit of the paramagnetic susceptibility measured along the easy-axis magnetization direction. The relative shift of adjacent chains by one-half of the chain period causes spin frustration due to interchain AFM coupling, which leads to AFM ordering at TN = 15 K. Neutron diffraction studies reveal that the AFM ordered state exhibits an incommensurate helimagnetic structure with the propagation vector k = (0, 0.356, 0). The Mn moments are arranged perpendicular to the chain propagation direction (the crystallographic b axis), and the turn angle around the helix is 128°. The magnetic properties of MnBi2Se4 are discussed in comparison to other linear-chain antiferromagnets based on ternary mixed-metal halides and chalcogenides.

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Section: Discussionsupporting

confidence: 58%

Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 93%

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Helimagnetism in MnBi2Se4 Driven by Spin-Frustrating Interactions Between Antiferromagnetic Chains

et al. 2021

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“…This decrease can be attributed to the increased covalency of the Mn–X bonding, which also should affect the strength of magnetic exchange interactions. Despite the simplicity of their crystal structures, manganese monochalcogenides are important reference materials, since the knowledge of their magnetic parameters and magnetic exchange interactions can be used to understand the influence of covalency and delocalization of chemical bonding − on the magnetic properties and magnetic structures of related materials, e.g., more complex ternary and quaternary chalcogenides. − …”

Section: Introductionmentioning

confidence: 99%

Inelastic Neutron Scattering Study of Magnetic Exchange Pathways in MnS

et al. 2021

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We report an investigation of the magnetic structure and magnetic exchange pathways in MnS via neutron scattering methods, aided by density functional theory (DFT) modeling. The material has been confirmed to undergo antiferromagnetic (AFM) ordering at 152 K, with the magnetic structure representing AFM stacking of ferromagnetic (FM) (111) planes of Mn magnetic moments. Correspondingly, the magnetic structure is described by a propagation vector k = (1/2, 1/2, 1/2), with the volume of the magnetic unit cell being 8 times larger than the volume of the nuclear unit cell. Analysis of inelastic neutron scattering (INS) data collected on a powder sample of MnS revealed that the next-nearest-neighbor magnetic exchange constant (J 2) exceeds the nearest-neighbor exchange constant (J 1) by more than 3 times, while in the case of MnO, which exhibits the same nuclear and magnetic structures as MnS, the J 2/J 1 ratio was reported to be below 1.5. Although for MnO the signs of both J 1 and J 2 indicated AFM exchange interactions, machine-learning INS data analysis in combination with DFT calculations suggests that the INS data collected on MnS are best described with J 1 < 0 and J 2 > 0, corresponding to FM and AFM exchange couplings, respectively. To achieve a satisfactory fit to the experimentally observed data, the Hamiltonian used to model the INS spectra also included the next-next-nearest-neighbor magnetic exchange constant (J 3). The best-fit model has been obtained with the values of the exchange constants J 1 = −0.27 meV, J 2 = 1.05 meV, and J 3 = −0.19 meV.

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“…so-called frustration phenomenon, such as Delta chain and the triangle structure in azurite and in K 2 MnS 2-x Se x [2,[16][17][18][19]. Because of the energy gap between the ground state and the excited state, the specific heat of the frustrated system usually shows peak in the low temperature, and the magnetic susceptibility is also different from that of antiferromagnetic system without frustration [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

The exact solution of magnetic susceptibility for finite Ising ring with a magnetic impurity

2021

Can. J. Phys.

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We connected the two ends of a finite spin-1/2 antiferromagnetic Ising chain with a magnetic impurity at one end to form a closed ring, and studied the magnetic susceptibility of it exactly by using the transfer matrix method. We calculated the magnetic susceptibility in the whole temperature range and gave the phase diagram at ground state of the system about the anisotropy of the impurity and strength of the connection exchange interaction for spin-1 and 3/2 impurities. We also gave the ground state entropy of system and derived the asymptotic expression of the magnetic susceptibility multiplied by temperature at zero temperature limit and high temperature limit. It is found that degenerate phase may exist in some parameter region at zero temperature for the spin number of system being odd, and the ground state entropy is ln⁡(2) in the nondegenerate phase and is dependent on the number of spin in the degenerate phase. The magnetic susceptibility of the system at low temperature exhibits ferromagnetic behavior, and the Curie constant is related to the spin configuration at ground state. When the ground state is nondegenerate, the Curie constant is equal to the square of the net spin, regardless of the parity of the number of the spin. When the number of spin is odd and the ground state is degenerate, the Curie constant may be related to the total number of spin. In high temperature limit, the magnetic susceptibility multiplied by temperature is related to the spin quantum number of impurity and the number of spin in the ring.

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Incommensurate magnetism in K2MnS2−xSex and prospects for tunable frustration in a triangular lattice of pseudo-1D spin chains

Cited by 7 publications

References 39 publications

Helimagnetism in MnBi2Se4 Driven by Spin-Frustrating Interactions Between Antiferromagnetic Chains

Helimagnetism in MnBi2Se4 Driven by Spin-Frustrating Interactions Between Antiferromagnetic Chains

Inelastic Neutron Scattering Study of Magnetic Exchange Pathways in MnS

The exact solution of magnetic susceptibility for finite Ising ring with a magnetic impurity

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