Correlation effects in ionic perovskite crystals
Licentiatavhandling, 2022
Our studies concern two classes of perovskite materials, the double perovskite, transition metal oxides LaSr1-xCaxNiReO6 for x = 0, 1 and the hybrid organometallic perovskite halides (CH3NH3)PbX3 for X = Br, Cl. We have mainly studied these compounds with muon spectroscopy (μ+SR), using muons as a magnetic probe to map the form and evolution of intrinsic electronic and nuclear magnetic fields.
The rhenium-based perovskites points of interest are high magnetic transition temperatures along with a variety of metallic or insulating behaviors. In the case of LaSr1-xCaxNiReO6 , x = 0, 1 we expect the substitution of Sr with Ca to alter the type of exchange interaction between the Ni and Re cations. This incentive drove us to investigate the formation and evolution of magnetic ordering as a function of temperature in both compounds.
The hybrid perovskites (CH3NH3)PbX3 , X = Br, Cl belong to the increasingly researched family of organometallic perovskite solar cell materials with long carrier diffusion lengths and a straightforward implementation into devices. However, intrinsic and extrinsic stability issues hinder the progress of application of these compounds. We aimed to indirectly identify intrinsic stability factors in the kinetics of the CH3NH3 molecule and the halide Br, Cl ion diffusion through their effect on the nuclear magnetic field distribution and dynamics.
muon spectroscopy
ion dynamics
correlated systems
multifunctional materials
spintronics
perovskites
magnetic order
solar cells
Författare
Konstantinos Papadopoulos
Chalmers, Fysik, Materialfysik
Intertwined magnetic sublattices in the double perovskite compound LaSrNiReO6
Physical Review B,;Vol. 102(2020)
Artikel i vetenskaplig tidskrift
Konstantinos Papadopoulos, Ola Kenji Forslund, Elisabetta Nocerino, Fredrik O.L. Johansson, Gediminas Simutis, Nami Matsubara, Gerald Morris, Bassam Hitti, Donald Arseneau, Jean-Christophe Orain, Vladimir Pomjakushin, Peter Svedlindh, Daniel Andreica, Lars Börjesson, Jun Sugiyama, Martin Månsson, and Yasmine Sassa. Influence of the Magnetic Sub-Lattices in the Double Perovskite Compound LaCaNiReO6
Konstantinos Papadopoulos, Ola Kenji Forslund, Elisabetta Nocerino, Nami Matsubara, P.K. Nayak, S. P. Cottrell, Lars Börjesson, Jun Sugiyama, Martin Månsson, and Yasmine Sassa. Photophysical dynamics in (CH3NH3)PbX3 (X=Br, Cl) single crystal perovskites studied by Muon-Spin Spectroscopy
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