A Minimal tight-binding model for ferromagnetic canted bilayer manganites

Baublitz, Millard; Lin, Hsin; Hafiz, Hasnain; Markiewicz, R. S.; Barbiellini, B.; Sun, Zhe; Dessau, D. S.; Bansil, Arun

doi:10.1038/srep07512

Cited by 6 publications

(3 citation statements)

References 42 publications

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“…| aα k > → | aασ k >. Then the effective hopping integral between any two ions depends on cos( θ /2) 53 , where θ is the angle between their spins. Consequently, i.e.…”

Section: Resultsmentioning

confidence: 99%

Magnetic ordering induced giant optical property change in tetragonal BiFeO3

Tong

Ding

Gong

et al. 2015

Sci Rep

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Magnetic ordering could have significant influence on band structures, spin-dependent transport, and other important properties of materials. Its measurement, especially for the case of antiferromagnetic (AFM) ordering, however, is generally difficult to be achieved. Here we demonstrate the feasibility of magnetic ordering detection using a noncontact and nondestructive optical method. Taking the tetragonal BiFeO3 (BFO) as an example and combining density functional theory calculations with tight-binding models, we find that when BFO changes from C1-type to G-type AFM phase, the top of valance band shifts from the Z point to Γ point, which makes the original direct band gap become indirect. This can be explained by Slater-Koster parameters using the Harrison approach. The impact of magnetic ordering on band dispersion dramatically changes the optical properties. For the linear ones, the energy shift of the optical band gap could be as large as 0.4 eV. As for the nonlinear ones, the change is even larger. The second-harmonic generation coefficient d33 of G-AFM becomes more than 13 times smaller than that of C1-AFM case. Finally, we propose a practical way to distinguish the two AFM phases of BFO using the optical method, which is of great importance in next-generation information storage technologies.

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“…| aα k > → | aασ k >. Then the effective hopping integral between any two ions depends on cos( θ /2) 53 , where θ is the angle between their spins. Consequently, i.e.…”

Section: Resultsmentioning

confidence: 99%

Magnetic ordering induced giant optical property change in tetragonal BiFeO3

Tong

Ding

Gong

et al. 2015

Sci Rep

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show abstract

“…The anisotropic strain along in-plane and out-of-plane directions induces large anisotropy in the local environment in the two directions. The hybridization between Mn 3 d orbitals and O 2 p orbitals then becomes anisotropic due to the difference of orbital overlap along these two different directions41. During the X-ray absorption process (from Mn core 1 s to Mn 4 p ), the charge transfer (from O 2 p to Mn 3 d ) existed simultaneously.…”

Section: Resultsmentioning

confidence: 99%

Effects of strain relaxation in Pr0.67Sr0.33MnO3 films probed by polarization dependent X-ray absorption near edge structure

Zhang

Chen

Yang

et al. 2016

Sci Rep

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The Mn K edge X-ray absorption near edge structure (XANES) of Pr0.67Sr0.33MnO3 films with different thicknesses on (001) LaAlO3 substrate was measured, and the effects of strain relaxation on film properties were investigated. The films showed in-plane compressive and out-of-plane tensile strains. Strain relaxation occurred with increasing film thickness, affecting both lattice constant and MnO6 octahedral rotation. In polarization dependent XANES measurements using in-plane (parallel) and out-of-plane (perpendicular) geometries, the different values of absorption resonance energy Er confirmed the film anisotropy. The values of Er along these two directions shifted towards each other with increasing film thickness. Correlating with X-ray diffraction (XRD) results it is suggested that the strain relaxation decreased the local anisotropy and corresponding probability of electronic charge transfer between Mn 3d and O 2p orbitals along the in-plane and out-of-plane directions. The XANES results were used to explain the film-thickness dependent magnetic and transport properties.

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“…We have repeated the calculation for a model of the coupled e 2g bands of a layered manganite 15 , Fig. 3 [Appendix].…”

Section: A D − D Excitonic Insulatorsmentioning

confidence: 99%

Excitonic insulators as a model of $d-d$ and Mott transitions in strongly correlated materials

Markiewicz¹,

Bansil²

2017

Preprint

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We show how strongly correlated materials could be described within the framework of an excitonic insulator formalism, and delineate the relationship between inter-and intra-band ordering phenomena. Our microscopic model of excitons clarifies the fundamental role of Van-Hove-singularitynesting in driving both inter-and intra-band ordering transitions, and uncovers an interesting connection with resonating-valence-bond physics.

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A Minimal tight-binding model for ferromagnetic canted bilayer manganites

Cited by 6 publications

References 42 publications

Magnetic ordering induced giant optical property change in tetragonal BiFeO3

Magnetic ordering induced giant optical property change in tetragonal BiFeO3

Effects of strain relaxation in Pr0.67Sr0.33MnO3 films probed by polarization dependent X-ray absorption near edge structure

Excitonic insulators as a model of $d-d$ and Mott transitions in strongly correlated materials

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