Magnetic ordering and transitions of EuSe studied by x-ray diffraction

Díaz, B.; Granado, E.; Abramof, E.; Torres, Lidia Maria Reis; Lechner, R. T.; Springholz, G.; Bauer, G.

doi:10.1103/physrevb.81.184428

Cited by 10 publications

(5 citation statements)

References 22 publications

(32 reference statements)

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“…For EuSe, J 1 and J 2 exhibit a different sign, while their absolute value is about the same, leading to a complex magnetic ordering. 4 A refined theoretical description for EuSe would require more neighbors to be taken into account.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

“…1,2 The relative alignment of these moments depends on the chalcogen atom. While EuO and EuS show a ferromagnetic (FM) order with Curie temperature of 69.7 and 16.5 K, respectively, 3 the magnetization exhibits a more complex pattern in EuSe, 4 indicating a subtle competition between a FM and an antiferromagnetic (AFM) order that can be modified by external parameters such as moderate pressure or strain. Replacing Se by Te then finally leads to an AFM magnetic ordering of the localized moments with a Neel temperature of 9.6 K. 3 The long-range magnetic order entails a large exchange splitting of the conduction bands, making the EuX series suitable for spin filter applications.…”

Section: Introductionmentioning

confidence: 99%

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Structural, electronic, and magnetic properties of the europium chalcogenides: A hybrid-functional DFT study

et al. 2013

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We analyze the structural, electronic, and magnetic properties of the europium chalcogenide series EuX (X = O, S, Se, and Te) using density-functional theory (DFT). To describe the localized 4f states of Eu, we utilize the parameter-free PBE0 and HSE hybrid functionals and found a systematic qualitative and quantitative improvement over the conventional local and semilocal functionals. Both hybrid functionals predict the lattice constant and the bulk modulus of all four compounds accurately. The semiconducting behavior, the opening of the band gap, as well as the nature of the band gap across the series is reproduced. By mapping the magnetic interactions to a Heisenberg model up to the next-nearest neighbors, we find the correct trend of the magnetic order of the Eu compounds (in magnetic coupling of the Eu 4f moments), from ferromagnetic in EuO to antiferromagnetic in EuTe, with critical temperatures that are in fair agreement with experiment.

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Section: Magnetic Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structural, electronic, and magnetic properties of the europium chalcogenides: A hybrid-functional DFT study

et al. 2013

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“…17 At high temperatures above ∼ 100 K the magnetic susceptibility follows for both field with the literature for EuSe. 17,21,22 In Fig. 5 the field dependences of the magnetization for the external field applied perpendicular and parallel to the surface are shown, respectively, documenting that the easy magnetization direction lies within the plane.…”

Section: A Bulk Magnetometrymentioning

confidence: 88%

Search for enhanced magnetism at the interface between Bi2Se3 and EuSe

et al. 2021

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Enhanced magnetism has recently been reported for the topological-insulator/ferromagnet interface Bi 2 Se 3 /EuS with Curie temperatures claimed to be raised above room temperature from the bulk EuS value of 16 K. Here we investigate the analogous interface Bi 2 Se 3 /EuSe. EuSe is a low-temperature layered ferrimagnet that is particularly sensitive to external perturbations. We find that superconducting quantum interference device (SQUID) magnetometry of Bi 2 Se 3 /EuSe heterostructures reveals precisely the magnetic phase diagram known from EuSe, including the ferrimagnetic phase below 5 K, without any apparent changes from the bulk behavior. Choosing a temperature of 10 K to search for magnetic enhancement, we determine an upper limit for a possible magnetic coercive field of 3 mT. Using interface sensitive x-ray absorption spectroscopy we verify the magnetic divalent configuration of the Eu at the interface without contamination by Eu 3+ , and by x-ray magnetic circular dichroism (XMCD) we confirm at the interface the magnetic hysteresis obtained by SQUID. XMCD data obtained at 10 K in a magnetic field of 6 T indicate a magnetic spin moment of m z,spin = 7 µ B /Eu 2+ , in good agreement with the SQUID data and the expected theoretical moment of Eu 2+ . Subsequent XMCD measurements in zero field show, however, that sizable remanent magnetization is absent at the interface for temperatures down to about 10 K.

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“…This will allow the investigation of many interesting magnetic transitions and effects. 5,6 The second experimental station will be dedicated to inelastic scattering and SAXS/WAXS experiments. A Kappa diffractometer in a rotation stage is already being commissioned at Guelph for this purpose, with a load capacity of 50 kg, suitable for complicated sample environments.…”

Section: End-stations and Applicationsmentioning

confidence: 99%

Undulator beamline of the Brockhouse sector at the Canadian Light Source

Díaz

Gómez

Meyer

et al. 2014

Review of Scientific Instruments

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The Brockhouse project at the Canadian Light Source plans the construction of three beamlines, two wiggler beamlines, and one undulator beamline, that will be dedicated to x-ray diffraction and scattering. In this work, we will describe the undulator beamline main components and performance parameters, obtained from ray tracing using XOP-SHADOW codes. The undulator beamline will operate from 4.95 to 21 keV, using a 20 mm period hybrid undulator placed upstream of the wiggler in the same straight section. The beamline optics design was developed in cooperation with the Brazilian Synchrotron - LNLS. The beamline will have a double crystal monochromator with the options of Si(111) or Si(311) crystal pairs followed by two mirrors in the KB configuration to focus the beam at the sample position. The high brilliance of the undulator source will produce a very high flux of ~10(13) photons/s and high energy resolution into a small focus of 170 μm horizontal and 20-60 μm vertical, depending on the optical configuration and energy chosen. Two multi-axis goniometer experimental stations with area detectors and analyzers are foreseen to enable diffraction, resonant and inelastic scattering experiments, and SAXS/WAXS experiments with high resolution and time resolving capabilities.

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Magnetic ordering and transitions of EuSe studied by x-ray diffraction

Cited by 10 publications

References 22 publications

Structural, electronic, and magnetic properties of the europium chalcogenides: A hybrid-functional DFT study

Structural, electronic, and magnetic properties of the europium chalcogenides: A hybrid-functional DFT study

Search for enhanced magnetism at the interface between Bi2Se3 and EuSe

Undulator beamline of the Brockhouse sector at the Canadian Light Source

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