Synthesis and magnetic studies of nanocrystalline <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si3.gif" overflow="scroll"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Cu</mml:mtext></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>OSeO</mml:mtext></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>, a chiral topological magnet

Malta, José F.; Henriques, Marta S. C.; Paixão, J. A.; Gonçalves, A.P.

doi:10.1016/j.jmmm.2018.10.120

Cited by 4 publications

(4 citation statements)

References 23 publications

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“…The compound can be obtained by thermal decomposition of CuSeO 3 in air at high temperatures [6] or using Cu 2 OSeO 3 . It has also been found as a contaminant during the synthesis of Cu 2 OSeO 3 [7,8]. In this work, we obtained high-quality monoclinic Cu 4 O(SeO 3 ) 3 single crystals when we tried to grow Cu 2 OSeO 3 using a CVT reaction.…”

Section: Introductionmentioning

confidence: 85%

“…A small crystal was selected for data-collection in a single crystal X-ray diffractometer (Bruker APEXII) equipped with a CCD detector and a Mo X-ray tube (λ = 0.71073 Å). The crystal was found to be a specimen of the monoclinic polymorph, with cell parameters a = 15.990(10), b = 13.518 (8), c = 17.745(12) Å, β = 90.49(5) • and space group P2 1 /a. A powder sample was also examined by XRD to check for the presence of extraneous phases.…”

Section: Structural Characterisationmentioning

confidence: 99%

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Magnetic studies of monoclinic Cu₄O(SeO₃)₃, a copper-oxo-selenite derivative

et al. 2020

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Cu4O(SeO3)3 is a copper-oxo-selenite belonging to the CuxO(SeO3)(x–1) family of the topological chiral magnet Cu2OSeO3. We report magnetometry and specific heat data measured in a monoclinic Cu4O(SeO3)3 single crystal grown through a Chemical Vapour Transport (CVT) reaction. Our study shows a typical antiferromagnetic behaviour, with a Néel temperature TN = 58 K, similar to that of the Cu2OSeO3 and an additional transition at 13 K. The effective magnetic moment per Cu atom is 1.84 μB, close to the expected theoretical value for Cu2+. The low-temperature M(H) curves, show a transition starting at Hc1 ~ 400 Oe at 1.8 K shifting to a lower value of ~ 280 Oe at 30 K, likely from a helical into a conical intermediate phase, and a second transition at Hc2 ~ 1 kOe, above which the net moment increases linearly with applied field. The magnetisation moment value in a 90 kOe field is 0.053 μB/Cu at 1.8 K and attains a maximum value of 0.061 μB at 13 K. Low-temperature specific heat measurements confirm the presence of the magnetic transition at 13 K, slightly shifting to lower temperatures under an applied magnetic field.

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Section: Introductionmentioning

confidence: 85%

Section: Structural Characterisationmentioning

confidence: 99%

Magnetic studies of monoclinic Cu₄O(SeO₃)₃, a copper-oxo-selenite derivative

et al. 2020

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“…The solid CuSeO 3 • 2 H 2 O precipitate was filtered from the solution and washed with distilled water, isopropanol, and acetone before drying at 50 • C on air for 18 hours.Cu 2 OSeO 3 nanoparticles were synthesised by heating CuSeO 3 • 2 H 2 O in an alumina crucible under a flow of O 2 in a tube furnace. At the initial heating stage, a dehydration process takes place in multiple steps leading to the overall reaction[42]…”

mentioning

confidence: 99%

“…The procedures used and the size of the nanoparticles produced (determined in the following sections) are detailed in Table1. It is worth noting that at higher temperatures or long time treatments, special care has to be taken not to thermally decompose the Cu 2 OSeO 3 further via[42] 2 Cu 2 OSeO 3…”

mentioning

confidence: 99%

Investigations of the size distribution and magnetic properties of nanoparticles of Cu$_2$OSeO$_3$

Holt¹,

Štefančič²,

Loudon³

et al. 2021

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Skyrmions in confined geometries have been a subject of increasing interest due to the different properties that they exhibit compared to their bulk counterparts. In this study, nanoparticles of skyrmion-hosting Cu 2 OSeO 3 have been synthesised using a precipitation method followed by thermal treatment. This enables us to produce nanoparticles whose mean size varies from tens of nanometers to a few micrometers by varying the temperature and duration of the thermal decomposition of the precursor. These sizes span the ∼ 63 nm diameter of skyrmions in Cu 2 OSeO 3 , allowing investigations into how the magnetic state changes when the size of the geometrical confinement is similar to and smaller than the size of an isolated magnetic skyrmion. AC susceptibility measurements performed on nanoparticles with a size distribution from 15 to 250 nm show a change in the magnetic phase diagram compared to bulk Cu 2 OSeO 3 .

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