ORCID Profile
0000-0003-2560-8584
Current Organisations
CEA Grenoble
,
Universite Grenoblé Alpes
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Publisher: Springer Science and Business Media LLC
Date: 31-10-2017
DOI: 10.1038/S41467-017-01301-0
Abstract: Transition-metal oxyhydrides are of considerable current interest due to the unique features of the hydride anion, most notably the absence of valence p orbitals. This feature distinguishes hydrides from all other anions, and gives rise to unprecedented properties in this new class of materials. Here we show via a high-pressure study of anion-ordered strontium vanadium oxyhydride SrVO 2 H that H − is extraordinarily compressible, and that pressure drives a transition from a Mott insulator to a metal at ~ 50 GPa. Density functional theory suggests that the band gap in the insulating state is reduced by pressure as a result of increased dispersion in the ab -plane due to enhanced V dπ -O pπ -V dπ overlap. Remarkably, dispersion along c is limited by the orthogonal V dπ -H 1s -V dπ arrangement despite the greater c -axis compressibility, suggesting that the hydride anions act as π-blockers. The wider family of oxyhydrides may therefore give access to dimensionally reduced structures with novel electronic properties.
Publisher: American Chemical Society (ACS)
Date: 12-08-2016
DOI: 10.1021/ACS.INORGCHEM.6B01484
Abstract: Topochemical reduction of the ordered double perovskite LaSrNiRuO6 with CaH2 yields LaSrNiRuO4, an extended oxide phase containing infinite sheets of apex-linked, square-planar Ni(1+)O4 and Ru(2+)O4 units ordered in a checkerboard arrangement. At room temperature the localized Ni(1+) (d(9), S = (1)/2) and Ru(2+) (d(6), S = 1) centers behave paramagnetically. However, on cooling below 250 K the system undergoes a cooperative phase transition in which the nickel spins align ferromagnetically, while the ruthenium cations appear to undergo a change in spin configuration to a diamagnetic spin state. Features of the low-temperature crystal structure suggest a symmetry lowering Jahn-Teller distortion could be responsible for the observed diamagnetism of the ruthenium centers.
Publisher: American Chemical Society (ACS)
Date: 13-02-2018
DOI: 10.1021/ACS.INORGCHEM.8B00026
Abstract: The anion-ordered oxide-hydride SrVO
Publisher: Springer Science and Business Media LLC
Date: 08-2022
DOI: 10.1038/S43246-022-00274-Y
Abstract: AA ′ 3 B 4 O 12 quadruple perovskites, with magnetic A ′ and non-magnetic B cations, are characterized by a wide range of complex magnetic structures. These are due to a variety of competing spin-exchange interactions up to the fourth nearest neighbours. Here, we synthesize and characterize the magnetic behaviour of the CaCo 3 Ti 4 O 12 quadruple perovskite. We find that in the absence of an external magnetic field, the system undergoes antiferromagnetic ordering at 9.3 K. This magnetic structure consists of three interpenetrating mutually orthogonal magnetic sublattices. Under an applied magnetic field, this antiferromagnetic structure evolves into a canted ferromagnetic structure. In explaining these magnetic structures, as well as the seemingly unrelated magnetic structures found in other quadruple perovskites, we suggest a crucial role played by the underlying kagome lattices in these systems. All observed magnetic structures of these materials represent indeed one of the three possible ways to reduce spin frustration in the A ′ site kagome layers. More specifically, our survey of the magnetic structures observed for quadruple perovskites AA ′ 3 B 4 O 12 reveals the following three ways to reduce spin frustration, namely to make each layer ferromagnetic, to adopt a compromise 120° spin arrangement in each layer, or to have a magnetic structure with a vanishing sum of all second nearest-neighbour spin exchanges.
Publisher: American Chemical Society (ACS)
Date: 28-10-2019
DOI: 10.1021/ACS.INORGCHEM.9B02459
Abstract: High-pressure X-ray diffraction measurements on the layered oxyhydrides Sr
Location: No location found
Location: No location found
No related grants have been discovered for Midori Estefani Amano Patino.