Percolated-induced ferrimagnetism

Manaka, Hirotaka; Nagata, Sanato; Watanabe, Yusuke; Kikunaga, Kazuya; Yamamoto, Tsuyoshi; Terada, Noriki; Obara, K.

doi:10.1088/1742-6596/145/1/012080

Cited by 4 publications

(6 citation statements)

References 9 publications

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“…, the higher Curie constants, as well as χ T values of 90Mn to 10Mn at room temperature (which are all above the linkage line between 100Mn and the extrapolated points for x =0) should be due to the distortion caused by the random occupation of Mn 2+ and Zn 2+ ions around Mn sites, which results in an increase of anisotropy of Mn 2+ 30. In the low‐temperature region, the enhancement of χ T values (as well as of magnetizations or χ) upon dilution was observed, and this is caused by local fluctuations in the total magnetic moment, which come from the destroyed balance of the antiferromagnetic sublattices in the vicinity of the nonmagnetic sites,1a, 2, 31a,b or the percolated‐induced ferrimagnetism 31c. The negative Θ values indicate the AF interaction between the anti–anti HCOO unit linking Mn 2+ sites in the presence of nonmagnetic Zn 2+ , and the linearity of Θ versus x could be fitted fairly well by Θ ( x )=−13.2 x (Figure 6 b).…”

Section: Resultsmentioning

confidence: 99%

Zinc‐Diluted Magnetic Metal Formate Perovskites: Synthesis, Structures, and Magnetism of [CH₃NH₃][Mn_xZn_1−x(HCOO)₃] (x=0–1)

Shang

Sun

Wang

et al. 2012

Chemistry An Asian Journal

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The preparation, structures, and magnetic properties of a series of metal formate perovskites [CH(3)NH(3)][Mn(x)Zn(1-x)(HCOO)(3)] were investigated. The isostructural solid solution can be prepared in the complete range of x=0-1. The metal-organic perovskite structures consist of an anionic NaCl type [Mn(x)Zn(1-x)(HCOO)(3)(-)] framework with CH(3)NH(3)(+) templates located in the nearly cubic cavities and forming hydrogen bonds to the framework. When the proportion of Mn increased (i.e., x changed from 0 to 1), the lattice dimensions and metal-oxygen and metal-metal distances show a slight, nonlinear increase because of the increased averaged metal ionic radius and the local structure distortion. Through the series, the magnetism changes from the long-range ordering of spin-canted antiferromagnetism for x≥0.40 to paramagnetism when x≤0.30, and the percolation limit was estimated to be x(P)=0.31(2) for this simple cubic lattice. In the low-temperature region, enhancement of magnetization and the gradual decrease and final disappearance of coercive field, remnant magnetization, and spin-flop field upon dilution were observed through this isotropic Heisenberg magnetic series. IR spectroscopic and thermal properties were also investigated.

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Section: Resultsmentioning

confidence: 99%

Zinc‐Diluted Magnetic Metal Formate Perovskites: Synthesis, Structures, and Magnetism of [CH₃NH₃][Mn_xZn_1−x(HCOO)₃] (x=0–1)

Shang

Sun

Wang

et al. 2012

Chemistry An Asian Journal

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“…The magnetization suppression by dilution for the present Co-Zn system is completely different from the magnetization enhancement observed in the reported Mn-Zn system 9b . In the isotropic Mn-Zn system, the enhancement was caused by local fluctuations in the total magnetic moment which come from the destroyed balance of the antiferromagnetic sublattices in the vicinity of the non-magnetic Zn 2+ sites 11a,23 , or the percolated-induced ferrimagnetism 24 . In the present anisotropic Co-Zn system, however, such enhancement could be suppressed by the anisotropy of Co 2+ because the moment was forced to be parallel to the easy (or Ising) axis 11a,23 .…”

Section: Magnetic Propertiesmentioning

confidence: 99%

An Anisotropic Diluted Magnetic Hybrid Perovskite Series of [CH3NH3][CoxZn1-x(HCOO)3]

Chen¹,

Shang²,

Wang³

et al. 2020

Acta Physico-Chimica Sinica

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Inorganic-organic or hybrid perovskite materials, which are the complementary counterparts of pure inorganic perovskites, can provide many new opportunities in the researches of phase transitions, critical phenomena, and relevant properties, as they combine the characteristics of inorganic and organic components. Therefore, the hybrid perovskites of ammonium metal formate framework are very promising, and their properties have been found to be strongly dependent on the characteristics of the constituent metal ions and/or ammonium ions. Herein, we used solid solution strategies, borrowed from solid state chemistry, to investigate the anisotropic diluted magnetic hybrid perovskite system of [CH3NH3][CoxZn1−x(HCOO)3], wherein the B-sites are occupied by the mixed metal ions of Co 2+ and Zn 2+ . The solid solution compounds of this series in the range x = 0-1 (or the molar percent Co% = 0-100%) were successfully prepared using conventional solution chemistry methods. The resulting compounds were demonstrated to be iso-structural by using both single-crystal and powder X-ray diffraction analyses. The solid solution crystals belong to the orthorhombic space group Pnma, with the cell parameters being a = 8.3015(2)-8.3207(3) Å, b = 11.6574(4)-11.6811(5) Å, c = 8.1315(3)-8.1427(4) Å, and V = 787.89(5)-790.98(7) Å 3 . The perovskite structure consists of a simple cubic anionic metal-formate framework and CH3NH3 + cations which are located in the framework cavities, with N-H•••O hydrogen bonds formed between the framework and the cation. The members of this series showed negligible changes (< 0.4%) in their respective lattice and structural parameters. Thus, the prepared solid solution compounds constitute good molecule-based examples for the study of magnetic dilution under almost the same structural parameters and molecular geometries. Upon dilution, the magnetization per mole of Co at low temperatures and low fields was suppressed by the magnetic anisotropy of Co 2+ and gradual destruction of the large spin canting between coupled Co 2+ ions, in contrast to the magnetization enhancement observed in the isotropic diluted system of [CH3NH3][MnxZn1−x(HCOO)3] with the same perovskite structure. The percolation limit was estimated as (Co%)P = 27(1)% (or xP = 0.27(1)) from the magnetic data, which was slightly lower than that predicted by the percolation theory for a simple cubic lattice (31%); this trend was due to the strong magnetic anisotropy of the present system. In addition, rare incommensurate phase transitions were primarily detected below ~120 K for the pure Co and Zn members, which may also affect the magnetic properties of the materials.

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“…1(a)]. 18 This is the mechanism at play in e.g. the series Fe1−xZnxF2, which shows a crossover from antiferromagnetism to ferrimagnetism as x is increased above a critical percolation threshold (xp 0.86 in this case).…”

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confidence: 96%

Percolation-induced ferrimagnetism from vacancy order in [Gua]Mn1–xFe2x/3(HCOO)3 hybrid perovskites

Bulled,

Willis,

Faure Beaulieu

et al. 2024

Preprint

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We report the magnetic behaviour of the hybrid perovskites [Gua]Mn1–xFe2x/3(HCOO)3 (0 < x < 0.88), showing that vacancy ordering drives bulk ferrimagnetism for x > 0.6. The behaviour is rationalised in terms of a simple microscopic model of percolation-induced ferrimagnetism. Monte Carlo simulations driven by this model reproduce the experimental dependence of magnetic susceptibility on x and show that, at intermediate compositions, domains of short-range vacancy order lead to the emergence of local magnetisation. Our results open up a new avenue for the design of multiferroic hybrid perovskites.

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Percolated-induced ferrimagnetism

Cited by 4 publications

References 9 publications

Zinc‐Diluted Magnetic Metal Formate Perovskites: Synthesis, Structures, and Magnetism of [CH₃NH₃][Mn_xZn_1−x(HCOO)₃] (x=0–1)

Zinc‐Diluted Magnetic Metal Formate Perovskites: Synthesis, Structures, and Magnetism of [CH₃NH₃][Mn_xZn_1−x(HCOO)₃] (x=0–1)

An Anisotropic Diluted Magnetic Hybrid Perovskite Series of [CH<sub>3</sub>NH<sub>3</sub>][Co<i><sub>x</sub></i>Zn<sub>1-<i>x</i></sub>(HCOO)<sub>3</sub>]

Percolation-induced ferrimagnetism from vacancy order in [Gua]Mn1–xFe2x/3(HCOO)3 hybrid perovskites

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Percolated-induced ferrimagnetism

Cited by 4 publications

References 9 publications

Zinc‐Diluted Magnetic Metal Formate Perovskites: Synthesis, Structures, and Magnetism of [CH3NH3][MnxZn1−x(HCOO)3] (x=0–1)

Zinc‐Diluted Magnetic Metal Formate Perovskites: Synthesis, Structures, and Magnetism of [CH3NH3][MnxZn1−x(HCOO)3] (x=0–1)

An Anisotropic Diluted Magnetic Hybrid Perovskite Series of [CH<sub>3</sub>NH<sub>3</sub>][Co<i><sub>x</sub></i>Zn<sub>1-<i>x</i></sub>(HCOO)<sub>3</sub>]

Percolation-induced ferrimagnetism from vacancy order in [Gua]Mn1–xFe2x/3(HCOO)3 hybrid perovskites

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Zinc‐Diluted Magnetic Metal Formate Perovskites: Synthesis, Structures, and Magnetism of [CH₃NH₃][Mn_xZn_1−x(HCOO)₃] (x=0–1)

Zinc‐Diluted Magnetic Metal Formate Perovskites: Synthesis, Structures, and Magnetism of [CH₃NH₃][Mn_xZn_1−x(HCOO)₃] (x=0–1)