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David G. Free

Researcher at University of Oxford

Publications -  8
Citations -  443

David G. Free is an academic researcher from University of Oxford. The author has contributed to research in topics: Magnetic structure & Selenide. The author has an hindex of 5, co-authored 8 publications receiving 390 citations.

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Enhancement of the superconducting transition temperature of FeSe by intercalation of a molecular spacer layer

TL;DR: In this paper, the composition of the spacer layers present in iron-based superconductors is altered to increase the temperature below which they superconduct, and intercalating FeSe with molecular spacer layer is also shown to enhance the superconducting transition temperature.
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Gradual destruction of magnetism in the superconducting family NaFe 1-x Co x As

TL;DR: In this article, the interplay and coexistence of superconducting, magnetic and structural order parameters in NaFe{1-x}Co{x} have been studied using SQUID magnetometry, muon-spin rotation and synchrotron x-ray powder diffraction.
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Competing Magnetic Structures and the Evolution of Copper Ion/Vacancy Ordering with Composition in the Manganite Oxide Chalcogenides Sr2MnO2Cu1.5(S1–xSex)2

TL;DR: The series Sr2MnO2Cu1.5(S1−xSex)2 (0 ≤ x ≤ 1) as mentioned in this paper contains mixed-valent Mn ions (Mn2+/Mn3+) in MnO2 sheets which are separated by copper-deficient antifluorite-type Cu2−δCh2 layers with δ ∼ 0.5.
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Spin-reorientation transition in CeMnAsO.

TL;DR: High-resolution X-ray and neutron powder diffraction are used to reveal details of the spin-reorientation transition in the layered oxide pnictide CeMnAsO, and it is clarified that neutron powder Diffraction methods are unable to distinguish between collinear and noncollinear arrangements of manganese and lanthanide moments when the moments have a component parallel to the MnAs planes.
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Soft chemical control of the crystal and magnetic structure of a layered mixed valent manganite oxide sulfide

TL;DR: In this paper, the deintercalation of copper ions from the sulfide layers of the layered mixed-valent manganite oxide sulfide Sr2MnO2 Cu 1.5S2 results in control of the copper-vacancy modulated superstructure and the ordered arrangement of magnetic moments carried by the manganese ions.