Electronic structure of epitaxially strained Sr<sub>2</sub>CrReO<sub>6</sub>
ORAL
Abstract
Rhenium-based double perovskites (DP) possess rich physics, including magnetic ordering at room temperature, which is a result of an intricate interplay between physical and electronic structure. Among them, Sr2CrReO6 (SCRO) stands out due to a high Curie temperature of Tc=620K, a strain-tunable magnetocrystalline anisotropy, and an insulating ground state with a bandgap of 0.21 eV, which can be explained theoretically by orbital ordering.
To characterize orbital ordering, synchrotron x-ray scattering is measured for three strain states of SCRO thin films, compressive (-1%) on a (LaAlO3)0.3(Sr2AlTaO6)0.7 (LSAT) substrate, tensile (+1%) on a relaxed SrCr0.5Nb0.5O3 buffer layer on LSAT, and relaxed on SrTiO3 (STO) substrate. The normally forbidden half-order diffraction peak ((1 1 0.5) in the pseudocubic system) is observed for the unstrained film grown on SrTiO3, but not for the strained films, which may indicate orbital ordering in the unstrained film. These results will be discussed in light of resonant inelastic x-ray scattering (RIXS) experimental data and calculations.
To characterize orbital ordering, synchrotron x-ray scattering is measured for three strain states of SCRO thin films, compressive (-1%) on a (LaAlO3)0.3(Sr2AlTaO6)0.7 (LSAT) substrate, tensile (+1%) on a relaxed SrCr0.5Nb0.5O3 buffer layer on LSAT, and relaxed on SrTiO3 (STO) substrate. The normally forbidden half-order diffraction peak ((1 1 0.5) in the pseudocubic system) is observed for the unstrained film grown on SrTiO3, but not for the strained films, which may indicate orbital ordering in the unstrained film. These results will be discussed in light of resonant inelastic x-ray scattering (RIXS) experimental data and calculations.
*Work at Yale is supported by a grant from the Department of Energy, Basic Energy Sciences under grant number DE-SC0019211.
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Presenters
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Guillaume Marcaud
- Yale University