The magnetic structure of Bi2Fe4O9– analysis of neutron diffraction measurements

Shamir, N.; Gurewitz, E.; Shaked, H.

doi:10.1107/s0567739478001412

Cited by 106 publications

(59 citation statements)

References 4 publications

(5 reference statements)

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“…3 was measured by Quantum Design's superconducting quantum interference device. Several crystals were probed and all showed antiferromagnetic transition at T N = 237Ϯ 1 K, a temperature somewhat below the T N = 265Ϯ 3 K reported for powder samples 3,8 but in a good agreement with the data available for single crystals. 9 The magnetic susceptibility was found to obey the Curie-Weiss law, ͑not shown here͒, with Ϸ −1670 K. 2 The Raman spectra were measured from natural ͑001͒, ͑100͒, ͑010͒, and ͑110͒ surfaces of Bi 2 Fe 4 O 9 single crystals using a triple Raman spectrometer T64000 ͑Horiba Jobin Yvon͒ equipped with microscope, optical cryostat, charge coupled device detector, and Ar + and He-Ne laser sources.…”

Section: Single Crystals Of Bisupporting

confidence: 68%

Phonon and magnon scattering of antiferromagneticBi2Fe4O9

et al. 2010

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The phonon structure of antiferromagnetic Bi 2 Fe 4 O 9 ͑space group Pbnm No. 55, T N Ϸ 240 K͒ was studied theoretically by calculations of lattice dynamics and experimentally between 10 and 300 K by polarized Raman spectroscopy. Most of the 12A g +12B 1g +9B 2g +9B 3g Raman modes were unambiguously identified. Strong second-order scattering was observed for ab-plane-confined incident and scattered light polarizations. In addition to the phonon-scattering, broad Raman bands with typical characteristics of magnon scattering appear below T N . The magnon bands are analyzed on the basis of magnetic structure of Bi 2 Fe 4 O 9 and attributed to two-magnon excitations.

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Section: Single Crystals Of Bisupporting

confidence: 68%

Phonon and magnon scattering of antiferromagneticBi2Fe4O9

et al. 2010

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“…13,14 This compound was originally synthesized in the seventies by Shamir et al, 16 but it has attracted recent interest since it is a common by-product in the synthesis of the well known multiferroic compound BiFeO 9 . In fact, Singh et al, 17 have shown that Bi 2 Fe 4 O 9 also shares some magnetoelectric properties.…”

Section: Fig 1: (Color Online)mentioning

confidence: 99%

“…The idea is to compare the low-E spectrum of the intermediate phase of the Cairo model with that of the unconstrained J 1 -J 2 -K model as we visit different regions in the J 1 /J 2 -K/J 2 plane. We have performed ED in the effective lattice model (which has 2 sites per unit cell) using clusters with 8,10,16,18,20,26, and 32 sites. The fully symmetric clusters with 8, 16 and 32 sites give the most clear and systematic evidence so we shall only discuss these clusters here.…”

Section: A Identifying the Relevant Effective Term Which Drives The mentioning

confidence: 99%

Quantum magnetism on the Cairo pentagonal lattice

2012

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We present an extensive analytical and numerical study of the antiferromagnetic Heisenberg model on the Cairo pentagonal lattice, the dual of the Shastry-Sutherland lattice with a close realization in the S = 5/2 compound Bi2Fe4O9. We consider a model with two exchange couplings suggested by the symmetry of the lattice, and investigate the nature of the ground state as a function of their ratio x and the spin S. After establishing the classical phase diagram we switch on quantum mechanics in a gradual way that highlights the different role of quantum fluctuations on the two inequivalent sites of the lattice. The most important findings for S = 1/2 include: (i) a surprising interplay between a collinear and a four-sublattice orthogonal phase due to an underlying order-by-disorder mechanism at small x (related to an emergent J1-J2 effective model with J2 ≫ J1), and (ii) a non-magnetic and possibly spin-nematic phase with d-wave symmetry at intermediate x.

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“…Simultaneously, ferromagnetic coupling occurs within a pair of octahedral spins [3]. These competing exchange interactions cause a geometrically spin-frustrated anti-ferromagnetic order in the Bi 2 Fe 4 O 9 compound [3,5,6]. The ferroelectricity in the Bi 2 Fe 4 O 9 is believed to originate from hybridization between the s-orbital of the Bi and the p-orbital of the O atoms.…”

Section: Introductionmentioning

confidence: 97%

“…Bi 2 Fe 4 O 9 is generally observed as an impurity phase of the perovskite BiFeO 3 and is known to exhibit multiferroic properties close to room temperature [3][4][5]. Bi 2 Fe 4 O 9 has an orthorhombic structure with a space group Pbam, and its unit cell is made up of two formula units consisting of evenly distributed FeO 4 tetrahedra and FeO 6 octahedra [6]. A unit cell of Bi 2 Fe 4 O 9 consists of columns of edge-sharing FeO 6 octahedra connected by corner-sharing FeO 4 tetrahedra and bismuth atoms.…”

Section: Introductionmentioning

confidence: 99%

Effect of the annealing temperature on the structural and multiferroic properties of mullite Bi2Fe4O9 thin films

Raghavan

Kim

et al. 2014

J Sol-Gel Sci Technol

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Mullite Bi 2 Fe 4 O 9 thin films were prepared on Pt(111)/Ti/SiO 2 /Si(100) substrates by using a chemical solution deposition method. The deposited Bi 2 Fe 4 O 9 thin films were annealed at a series of temperatures in the range 700-850°C in an oxygen atmosphere using a rapid thermal annealing process. The effect of the annealing temperature on the structural, electrical and multiferroic properties of the Bi 2 Fe 4 O 9 thin films was investigated. The results showed that the Bi 2 Fe 4 O 9 thin film that was annealed at 800°C exhibits a well-crystallized orthorhombic phase with the complete absence of secondary phases, in marked contrast to the thin films that were annealed at 700, 750, and 850°C for which the formation of secondary phases was observed. Moreover, the Bi 2 Fe 4 O 9 thin film that was annealed at 800°C was found to exhibit a low leakage current density and enhanced multiferroic properties, both of which are indicative of the formation of a pure mullite phase with a stable structure.

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The magnetic structure of Bi₂Fe₄O₉– analysis of neutron diffraction measurements

Cited by 106 publications

References 4 publications

Phonon and magnon scattering of antiferromagneticBi2Fe4O9

Phonon and magnon scattering of antiferromagneticBi2Fe4O9

Quantum magnetism on the Cairo pentagonal lattice

Effect of the annealing temperature on the structural and multiferroic properties of mullite Bi2Fe4O9 thin films

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