The high-intensity reflectometer of the Jülich Centre for Neutron Science: MARIA

Mattauch, Stefan; Koutsioubas, Alexandros; Rücker, Ulrich; Korolkov, Denis; Fracassi, V.; Daemen, J.; Schmitz, R.; Bussmann, Klaus; Suxdorf, F.; Wagener, Michael; Kammerling, P.; Kleines, H.; Fleischhauer-Fuß, Lydia; Bednareck, Manfred; Ossoviy, Vladimir; Nebel, Andreas; Stronciwilk, P. P.; Staringer, S.; Gödel, Marko; Richter, Alfred; Kusche, Harald; Kohnke, Thomas; Ioffe, A.; Babcock, Earl; Salhi, Zahir; Brückel, Thomas

doi:10.1107/s1600576718006994

Cited by 56 publications

(48 citation statements)

References 27 publications

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“…In the resistivity measurement the magnetic field was applied along the sample surface direction and perpendicular to the current direction. The PNR measurements were carried out at the polarized magnetic reflectometer MARIA at the Heinz Maier‐Leibnitz Zentrum (MLZ) in Garching, Germany . Both the R + + and R − − reflectivity were measured at 0.3 T higher than the saturation field, along the in‐plane easy axis [010] direction.…”

Section: Methodsmentioning

confidence: 99%

Reversible Control of Physical Properties via an Oxygen‐Vacancy‐Driven Topotactic Transition in Epitaxial La_0.7Sr_0.3MnO₃₋_δ Thin Films

et al. 2018

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In complex oxides, oxygen defects play a crucial role for physical functionalities. For instance, the presence of vacant anion sites can induce a large ionic conductivity, with relevant applications including solid oxide fuel cells, electrolyte membranes, catalysts, and oxygen sensors. [1][2][3][4] In addition, oxygen vacancy migration driven by low voltages possesses excellent resistance switching characteristics, promoting the emergence of novel oxide devices for resistive switching random access memory. [5][6][7][8] Beyond these, especially among transition metal oxides with mixed valence, oxygen off-stoichiometry alters oxidation states of the transition metal, the metal-oxygenmetal bond angles and the overall charge carrier concentration, which are essential for a multitude of unique phenomena, such as various forms of magnetism, superconductivity, magnetoresistance, and multiferroics. [9,10] Due to the profound influence of oxygen defects, particular attention has been devoted to functional oxides accommodating oxygen content variations. A significant development in recent studies is the realization of a layered vacancy ordered brownmillerite (BM) structure that can be topotactically transformed from a perovskite (PV) structure framework, in which one-sixth of the oxygen anions have been removed. [11][12][13] The special feature of this structure type is demonstrated to provide additional mechanisms for proton and oxide-ion conduction. [14][15][16] However, very few studies have been conducted regarding the dynamic behavior of oxygen vacancies and the transformation mechanisms between distinctive topotactic phases. Such mechanistic details will not only aid the fundamental understanding of oxygen vacancy physics, but also open comprehensive prospects for novel ionic conductor devices. In this view, a real-time investigation of the structural evolution is crucial for addressing the full details of the phase transition process.Strontium-doped lanthanum manganites (La 1−x Sr x MnO 3 ) exhibit a variety of unique tunable functionalities such as colossal magnetoresistance, half-metallicity, and ferromagnetism above room temperature, which can be considered as a novel platform to study the topotactic transition mechanism andThe vacancy distribution of oxygen and its dynamics directly affect the functional response of complex oxides and their potential applications. Dynamic control of the oxygen composition may provide the possibility to deterministically tune the physical properties and establish a comprehensive understanding of the structure-property relationship in such systems. Here, an oxygen-vacancy-induced topotactic transition from perovskite to brownmillerite and vice versa in epitaxial La 0.7 Sr 0.3 MnO 3−δ thin films is identified by real-time X-ray diffraction. A novel intermediate phase with a noncentered crystal structure is observed for the first time during the topotactic phase conversion which indicates a distinctive transition route. Polarized neutron reflectometry confirms an oxygen-deficient in...

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Section: Methodsmentioning

confidence: 99%

Reversible Control of Physical Properties via an Oxygen‐Vacancy‐Driven Topotactic Transition in Epitaxial La_0.7Sr_0.3MnO₃₋_δ Thin Films

et al. 2018

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“…If there is magnetic neutron scattering, then BornAgain can be used to simulate all the functionality of a polarizing reflectometer, like MARIA at MLZ Garching (Mattauch et al, 2018). This is all one needs for X-rays and for nuclear scattering of neutrons.…”

Section: Magnetism and Neutron Polarizationmentioning

confidence: 99%

BornAgain: software for simulating and fitting grazing-incidence small-angle scattering

et al. 2020

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BornAgain is a free and open-source multi-platform software framework for simulating and fitting X-ray and neutron reflectometry, off-specular scattering, and grazing-incidence small-angle scattering (GISAS). This paper concentrates on GISAS. Support for reflectometry and off-specular scattering has been added more recently, is still under intense development and will be described in a later publication. BornAgain supports neutron polarization and magnetic scattering. Users can define sample and instrument models through Python scripting. A large subset of the functionality is also available through a graphical user interface. This paper describes the software in terms of the realized nonfunctional and functional requirements. The web site https://www. bornagainproject.org/ provides further documentation.

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“…Again, we see very little changes, but due to improved statistics the decay at shear rated above 100s -1 is clearly significant. From pure rheological measurements [9], we know that beyond shear rates of 2000 to 3000s -1 the strong field induces larger domain interfaces. This means that then the equilibrium interface with each surfactant molecule having a typical head group area a [11] is violated and enlarged by the shear field.…”

Section: Resultsmentioning

confidence: 99%

“…Neutron Reflectometry was conducted on the instrument MARIA at the MLZ Garching [8,9]. The neutron wavelength was 5Å.…”

Section: Methodsmentioning

confidence: 99%

Characterization of a Bicontinuous Microemulsion Flowing along a Planar Surface

Frielinghaus

Lipfert

Mattauch

2019

Proceedings of the 3rd International Symposium of Quantum Beam Science at Ibaraki University "Quantum Beam Science in Biology A

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We present a study on a bicontinuous microemulsion exposed to a planar hydrophilic surface with a flow field along the interface using neutron reflectometry. The microemulsion displays a lamellar interface ordering. The range of apparent shear rates was ranging from 8 to 600s-1. In this range, no considerable structural change of the lamellar structure was observed. This finding supports previous rheological experiments where the so-called lubrication effect was foundan unchanged facilitated flow of the lamellar structure along the surfacefor a wide range of shear rates.

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The high-intensity reflectometer of the Jülich Centre for Neutron Science: MARIA

Cited by 56 publications

References 27 publications

Reversible Control of Physical Properties via an Oxygen‐Vacancy‐Driven Topotactic Transition in Epitaxial La_0.7Sr_0.3MnO₃₋_δ Thin Films

Reversible Control of Physical Properties via an Oxygen‐Vacancy‐Driven Topotactic Transition in Epitaxial La_0.7Sr_0.3MnO₃₋_δ Thin Films

BornAgain: software for simulating and fitting grazing-incidence small-angle scattering

Characterization of a Bicontinuous Microemulsion Flowing along a Planar Surface

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The high-intensity reflectometer of the Jülich Centre for Neutron Science: MARIA

Cited by 56 publications

References 27 publications

Reversible Control of Physical Properties via an Oxygen‐Vacancy‐Driven Topotactic Transition in Epitaxial La0.7Sr0.3MnO3−δ Thin Films

Reversible Control of Physical Properties via an Oxygen‐Vacancy‐Driven Topotactic Transition in Epitaxial La0.7Sr0.3MnO3−δ Thin Films

BornAgain: software for simulating and fitting grazing-incidence small-angle scattering

Characterization of a Bicontinuous Microemulsion Flowing along a Planar Surface

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Reversible Control of Physical Properties via an Oxygen‐Vacancy‐Driven Topotactic Transition in Epitaxial La_0.7Sr_0.3MnO₃₋_δ Thin Films

Reversible Control of Physical Properties via an Oxygen‐Vacancy‐Driven Topotactic Transition in Epitaxial La_0.7Sr_0.3MnO₃₋_δ Thin Films