Antiferro-Ferrimagnatic Transition in Triangular Ising Lattice

Mekata, Mamoru

doi:10.1143/jpsj.42.76

Cited by 297 publications

(144 citation statements)

References 8 publications

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“…Therefore, the chiral symmetry breaking effect for the necklace and array systems shown above can be considered as a chiral analogy of the phase transition from the anti-ferromagnetic state to the ferrimagnetic state found in iron selenide 52,53 , and it shows a new possibility to create and design artificial phase-transition effects on demand in metamaterials, without the need of introducing naturally existing phase-change materials.…”

Section: Resultsmentioning

confidence: 99%

Spontaneous chiral symmetry breaking in metamaterials

et al. 2014

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Spontaneous chiral symmetry breaking underpins a variety of areas such as subatomic physics and biochemistry, and leads to an impressive range of fundamental phenomena. Here we show that this prominent effect is now available in artificial electromagnetic systems, enabled by the advent of magnetoelastic metamaterials where a mechanical degree of freedom leads to a rich variety of strong nonlinear effects such as bistability and self-oscillations. We report spontaneous symmetry breaking in torsional chiral magnetoelastic structures where two or more meta-molecules with opposite handedness are electromagnetically coupled, modifying the system stability. Importantly, we show that chiral symmetry breaking can be found in the stationary response of the system, and the effect is successfully demonstrated in a microwave pump-probe experiment. Such symmetry breaking can lead to a giant nonlinear polarization change, energy localization and mode splitting, which provides a new possibility for creating an artificial phase transition in metamaterials, analogous to that in ferrimagnetic domains.

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Section: Resultsmentioning

confidence: 99%

Spontaneous chiral symmetry breaking in metamaterials

et al. 2014

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“…In frustrated Ising triangular (i.e. hexagonal) antiferromagnets, a PDA state refers to a partially disordered antiferromagnetic state where spins on a honeycomb lattice portion of the hexagonal lattice order antiferromagnetically, and the rest of spins are disordered 12 . Due to the evident analogy, we will call the non-polar P3c1 as a PUA (partially undistorted antiferroelectric) state [ Fig.…”

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confidence: 99%

Delicate balance between ferroelectricity and antiferroelectricity in hexagonal InMnO3

Huang

Wang

et al. 2013

Phys. Rev. B

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“…The zero-field magnetic structure of Ca 3 Co 2 O 6 has yet to be described unambiguously. Most theoretical descriptions of the magnetic structure center around the two stable configurations for 1D Ising chains coupled antiferromagnetically on a 2D triangular lattice, the ferrimagnetic structure (M, M, −M ) and the partially disordered antiferromagnetic (PDA) structure (M, −M, 0) [18] (the labels in parenthesis indicate the relative magnetizations on the triangular lattice). The step-like magnetization has been described using the Ising model on a triangular lattice [7].…”

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confidence: 99%

Nature of the Magnetic Order inCa3Co2O6

et al. 2008

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We present a detailed powder and single crystal neutron diffraction study of the spin chain compound Ca3Co2O6. Below 25 K, the system orders magnetically with a modulated partially disordered antiferromagnetic structure. We give a description of the magnetic interactions in the system which is consistent with this magnetic structure. Our study also reveals that the long-range magnetic order co-exists with a shorter range order with a correlation length scale of ∼ 180Å in the ab plane. Remarkably, on cooling, the volume of material exhibiting short range order increases at the expense of the long-range order.PACS numbers: 75.30. Gw, 75.25.+z, 75.30.Fv, 75.50.Ee The appearance of plateaux in the magnetization curves of low dimensional quantum spin systems (e.g. NH 4 CuCl 3 [1] and SrCu 2 (BO 3 ) 2 [2]) has generated considerable attention from both an experimental and a theoretical point of view. In this respect the spin chain system Ca 3 Co 2 O 6 is very interesting because at low temperatures several steps, equally spaced in magnetic field, appear in the magnetization [3,4,5], a behavior reminiscent of quantum tunneling of magnetization in molecular magnets [6]. The origin of this intriguing phenomenon is still an open question [7,8] and the magnetic properties of Ca 3 Co 2 O 6 have been intensely studied in the past decade using many techniques, including x-ray [9,10,11] and neutron [12,13,14] Ca 3 Co 2 O 6 is a rare example of a material where ferromagnetic (FM) 1D Ising spin chains are coupled through a much weaker antiferromagnetic (AF) exchange on a triangular lattice. The spin chains in Ca 3 Co 2 O 6 are made up of alternating face-sharing octahedral (CoI) and trigonal prismatic (CoII) CoO 6 polyhedra, running along the c axis and arranged in a triangular lattice in the ab plane [17]. The different Co environments leave the Co 3+ ions on the CoI sites in a low-spin (S=0) state, and those on the CoII sites in the high-spin (S=2) state [9,11,15]. Crystalline electric fields also lead to a very strong anisotropy with the moments preferentially aligned along the c axis [3,4]. The zero-field magnetic structure of Ca 3 Co 2 O 6 has yet to be described unambiguously. Most theoretical descriptions of the magnetic structure center around the two stable configurations for 1D Ising chains coupled antiferromagnetically on a 2D triangular lattice, the ferrimagnetic structure (M, M, −M ) and the partially disordered antiferromagnetic (PDA) structure (M, −M, 0) [18] (the labels in parenthesis indicate the relative magnetizations on the triangular lattice). The step-like magnetization has been described using the Ising model on a triangular lattice [7]. There are, however, experimental data which suggest a more complex magnetic structure for Ca 3 Co 2 O 6 . A pronounced drop in the intensity of the magnetic peaks on cooling below 18 K in zero field has been observed in powder [12,13] and single crystal diffraction studies [14]. Recent resonant x-ray scattering (RXS) studies [10] showed a small (∼ 0.01Å −1 ) incommensu...

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Antiferro-Ferrimagnatic Transition in Triangular Ising Lattice

Cited by 297 publications

References 8 publications

Spontaneous chiral symmetry breaking in metamaterials

Spontaneous chiral symmetry breaking in metamaterials

Delicate balance between ferroelectricity and antiferroelectricity in hexagonal InMnO3

Nature of the Magnetic Order inCa3Co2O6

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