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Marchukov, P.; Geick, R.; Brotzeller, C.; Treutmann, W.; Eg, Rudashevsky; Am, Balbashov

doi:10.1103/physrevb.48.13538

Cited by 32 publications

(21 citation statements)

References 17 publications

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“…2 has been attributed to intrinsic weak ferromagnetism in a number systems as a consequence of the Dzyaloshinskii-Moriya interaction ͑DM͒. [26][27][28][29][30] Spin canting leading to weak ferromagnetism in the absence of the DM interaction has also been observed previously in Ba 2 Cu 3 O 4 Cl 2 . 31 The weak ferromagnetism could also arise from local disordering of the spin structure as a result of a combination of competing interactions and the reduced dimensionality.…”

Section: Resultssupporting

confidence: 63%

Magnetic structure and susceptibility ofCoSe2O5: An antiferromagnetic chain compound

et al. 2010

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CoSe 2 O 5 has a crystal structure consisting of zigzag chains of edge shared CoO 6 octahedra running along the c axis with the chains separated by Se 2 O 5 2− units. Magnetic-susceptibility measurements indicate a transition at 8.5 K to an ordered state. We investigate the nature of this magnetic order using magnetization and specific-heat measurements, in addition to powder neutron diffraction. A transition to long-range antiferromagnetic order is found below T N = 8.5 K as identified by magnetic-susceptibility and heat-capacity measurements, and the emergence of magnetic Bragg reflections with a propagation vector k = 0. The low-field magneticsusceptibility data indicate the presence of weak ferromagnetism in the antiferromagnetic ordered state which saturates in very small fields. Heat-capacity measurements at low temperatures indicate that only about half the configurational entropy is released at T N . The functional form of the heat capacity below T N suggests the presence of a gap of 6.5 K in the magnon dispersion. The refined magnetic structure shows that the moments align perpendicular to the c axis, and tilting alternately by +14°and −14°with respect to the a axis.

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Section: Resultssupporting

confidence: 63%

Magnetic structure and susceptibility ofCoSe2O5: An antiferromagnetic chain compound

et al. 2010

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“…Motivated by this idea, and that the longer Mn oct -O int can decouple the magnetic sublattices, we investigate the effect of different magnetic sublattices in the various layers. Different magnetic sublattices have also earlier been suggested to explain an anomaly in the magnetic susceptibility of brownmillerite CaFeO 2.5 27, 28 . Parallel ordering of spins in the octahedral layers combined with anti-parallel ordering of spins in the tetrahedral layers are found to be more stable than other configurations with parallel spins in the tetrahedral layers and/or anti-parallel spins octahedral layers, as shown in (Fig.…”

Section: Resultsmentioning

confidence: 86%

Spatially Confined Spin Polarization and magnetic sublattice control in (La,Sr)MnO3−δ Thin Films by Oxygen Vacancy Ordering

Moreau

Selbach

Tybell

2017

Sci Rep

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Perovskite oxides are known for their strong structure property coupling and functional properties such as ferromagntism, ferroelectricity and high temperature superconductivity. While the effect of ordered cation vacancies on functional properties have been much studied, the possibility of tuning the functionality through anion vacancy ordering has received much less attention. Oxygen vacancies in ferromagnetic La0.7Sr0.3MnO3−δ thin films have recently been shown to accumulate close to interfaces and form a brownmillerite structure (ABO2.5). This structure has alternating oxygen octahedral and tetrahedral layers along the stacking direction, making it a basis for a family of ordered anion defect controlled materials. We use density functional theory to study how structure and properties depend on oxygen stoichiometry, relying on a block-by-block approach by including additional octahedral layers in-between each tetrahedral layer. It is found that the magnetic and electronic structures follow the layers enforced by the ordered oxygen vacancies. This results in spatially confined electronic conduction in the octahedral layers, and decoupling of the magnetic sub-lattices in the octahedral and tetrahedral layers. These results demonstrate that anion defect engineering is a promising tool to tune the properties of functional oxides, adding a new avenue for developing functional oxide device technology.

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“…Although most of these materials show a G-type AFM behaviour, [35] Marchukov et al [40] have concluded that the dicalcium ferrite provides a very interesting possibility for this layered structure to be treated as two canted antiferromagnets by putting one into the other with an antiferromagnetic interaction between the weak ferromagnetic components. Its magnetisation curve suggests a rather small ferromagnetic component (0.67 emu g À1 at 20 K) which is more than one order of magnitude smaller than that observed in La 0.5 Sr 0.5 MnO 2.5 .…”

Section: Double Distances Along [010] C //A C H T U N G T R E N N U Nmentioning

confidence: 98%

Ferromagnetism in a New Manganese‐Related Brownmillerite: La_0.5Sr_0.5MnO_2.5

Cortés‐Gil

Ruiz‐González

Alonso

et al. 2007

Chemistry A European J

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The topotactic reduction of La0.5Sr0.5MnO3 leads to ordering of the anionic vacancies in the La0.5Sr0.5MnO2.5 composition. The isolated material, which is isostructural with Sr2Fe2O5, crystallises in the brownmillerite structural type with unit cell parameters a=0.54117(3), b=1.67608(12), c=0.54004(3) nm and space group Ibm2. Its microstructural characterisation by means of electron diffraction and high-resolution electron microscopy suggests a complex microstructure arising from the coherent intergrowth of different brownmillerite-type domains that show short-range ordering at the A sub-lattice. The layer structure of La0.5Sr0.5MnO2.5 leads to a double magnetic behaviour where a ferromagnetic two-dimensional component is present.

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Static magnetic properties of the many-sublattice antiferromagnetCa2Fe2

Cited by 32 publications

References 17 publications

Magnetic structure and susceptibility ofCoSe2O5: An antiferromagnetic chain compound

Magnetic structure and susceptibility ofCoSe2O5: An antiferromagnetic chain compound

Spatially Confined Spin Polarization and magnetic sublattice control in (La,Sr)MnO3−δ Thin Films by Oxygen Vacancy Ordering

Ferromagnetism in a New Manganese‐Related Brownmillerite: La_0.5Sr_0.5MnO_2.5

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Static magnetic properties of the many-sublattice antiferromagnetCa2Fe2

Cited by 32 publications

References 17 publications

Magnetic structure and susceptibility ofCoSe2O5: An antiferromagnetic chain compound

Magnetic structure and susceptibility ofCoSe2O5: An antiferromagnetic chain compound

Spatially Confined Spin Polarization and magnetic sublattice control in (La,Sr)MnO3−δ Thin Films by Oxygen Vacancy Ordering

Ferromagnetism in a New Manganese‐Related Brownmillerite: La0.5Sr0.5MnO2.5

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Ferromagnetism in a New Manganese‐Related Brownmillerite: La_0.5Sr_0.5MnO_2.5