Strain-phonon coupling in (111)-oriented perovskite oxides

Moreau, Magnus; Marthinsen, Astrid; Selbach, Sverre M.; Tybell, Thomas

doi:10.1103/physrevb.96.094109

Cited by 9 publications

(9 citation statements)

References 70 publications

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“…We note that rotations in (1 1 1)-oriented LAO are found by DFT to increase close to linear with amount of tensile strain [22], allowing us to extrapolate an expected 10.3° rotational angle for LSMO on DSO. In (0 0 1)-oriented thin films, the effective rotations are larger around the most tensile strained direction [36]. Assuming this is also true for (1 1 1)-oriented LSMO, the rotations should be largest around the a pc and b pc directions (a pc = b pc = 3.96 whilst c pc = 3.89).…”

Section: Resultsmentioning

confidence: 84%

Effect of (1 1 1)-oriented strain on the structure and magnetic properties of La_0.7Sr_0.3MnO₃ thin films

Bolstad¹,

Lysne²,

Hallsteinsen³

et al. 2018

J. Phys.: Condens. Matter

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Using strain, i.e. subtle changes in lattice constant in a thin film induced by the underlying substrate, opens up intriguing new ways to control material properties. We present a study of the effects of strain on structural and ferromagnetic properties of (1 1 1)-oriented LaSrMnO epitaxial thin films grown on NdGaO, SrTiO, and DyScO substrates. (The subscript pc denotes the pseudo-cubic symmetry.) The results show that LaSrMnO assumes a monoclinic unit cell on NdGaO and DyScO and a rhombohedral unit cell on SrTiO. For LaSrMnO on NdGaO and DyScO a uniaxial magnetic anisotropy is found, while LaSrMnO on SrTiO is magnetically isotropic. The Néel model is used to explain the anisotropy of the thin films on NdGaO and SrTiO, however, for LaSrMnO on DyScO the effect of octahedral rotations needs to be included through the single ion model. Through examination of the Curie temperature of the strained films we suggest that (1 1 1)-strain has a different effect on the Jahn-Teller splitting of e and t electron levels than what is seen in (0 0 1)-oriented LaSrMnO thin films.

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Section: Resultsmentioning

confidence: 84%

Effect of (1 1 1)-oriented strain on the structure and magnetic properties of La_0.7Sr_0.3MnO₃ thin films

Bolstad¹,

Lysne²,

Hallsteinsen³

et al. 2018

J. Phys.: Condens. Matter

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“…)a pc pseudohexagonal cells with 120 atoms. The in-plane a and b vectors of the supercells were fixed to be equal to the DFT-calculated bulk values of the substrate materials, while the out-of-plane c vector was allowed to relax [54]. Brillouin zone integration was done on a -centered 3 × 3 × 3 k-point mesh for the strained LFO supercells.…”

Section: Methodsmentioning

confidence: 99%

Uniaxial Néel vector control in perovskite oxide thin films by anisotropic strain engineering

Kjærnes

Hallsteinsen²,

Chopdekar³

et al. 2021

Phys. Rev. B

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Antiferromagnetic (AF) thin films typically exhibit a multidomain state, and control of the AF Néel vector is challenging, as AF materials are robust to magnetic perturbations. In this paper, uniaxial Néel vector control is demonstrated by relying on anisotropic strain engineering of epitaxial thin films of the prototypical AF material LaFeO 3 (LFO). Orthorhombic (011)-and ( 101)-oriented DyScO 3 ,GdScO , and NdGaO 3 substrates are used to engineer different anisotropic in-plane strain states. The anisotropic in-plane strain stabilizes structurally monodomain monoclinic LFO thin films. The uniaxial Néel vector is found along the tensile strained b axis, contrary to bulk LFO having the Néel vector along the shorter a axis, and no magnetic domains are found. Hence, anisotropic strain engineering is a viable tool for designing unique functional responses, further enabling AF materials for mesoscopic device technology.

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“…In particular, en route to the two-dimensional limit from the three-dimensional limit, one may encounter "hidden" topological states 92 in the electronic band structure. There is now a rather vast literature on predicted topological states in [111] grown pyrochlore iridate thin films [92][93][94][95][96][97] , and other related systems [28][29][30][31]36,[42][43][44][98][99][100][101][102][103][104][105][106][107] . As we mentioned in the introduction, it is not our intent to provide a comprehensive review, but rather highlight the richness of possibilities in this system.…”

Section: [111] Pyrochlore Latticementioning

confidence: 99%

Perspective: Strongly correlated and topological states in [111] grown transition metal oxide thin films and heterostructures

Chakhalian,

Liu,

Fiete

2020

Preprint

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We highlight recent advances in the theory, materials fabrication, and experimental characterization of strongly correlated and topological states in [111] oriented transition metal oxide thin films and heterostructures, which are notoriously difficult to realize compared to their [001] oriented counterparts. We focus on two classes of complex oxides, with the chemical formula ABO 3 and A 2 B 2 O 7 , where the B sites are occupied by an open-shell transition metal ion with a local moment, and the A sites are typically a rare earth. The [111] oriented quasi-two-dimensional lattices derived from these parent compound lattices can exhibit peculiar geometries and symmetries, namely, a buckled honeycomb lattice, as well as kagome and triangular lattices. These lattice motifs form the basis for emergent strongly correlated and topological states expressed in exotic magnetism, various forms of orbital ordering, topological insulators, topological semimetals, quantum anomalous Hall insulators, and quantum spin liquids. For transition metal ions with high atomic number, spin-orbit coupling plays a significant role and may give rise to additional topological features in the electronic band structure and in the spectrum of magnetic excitations. We conclude the Perspective by articulating open challenges and opportunities in this actively developing field.

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Strain-phonon coupling in (111)-oriented perovskite oxides

Cited by 9 publications

References 70 publications

Effect of (1 1 1)-oriented strain on the structure and magnetic properties of La_0.7Sr_0.3MnO₃ thin films

Effect of (1 1 1)-oriented strain on the structure and magnetic properties of La_0.7Sr_0.3MnO₃ thin films

Uniaxial Néel vector control in perovskite oxide thin films by anisotropic strain engineering

Perspective: Strongly correlated and topological states in [111] grown transition metal oxide thin films and heterostructures

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Strain-phonon coupling in (111)-oriented perovskite oxides

Cited by 9 publications

References 70 publications

Effect of (1 1 1)-oriented strain on the structure and magnetic properties of La0.7Sr0.3MnO3 thin films

Effect of (1 1 1)-oriented strain on the structure and magnetic properties of La0.7Sr0.3MnO3 thin films

Uniaxial Néel vector control in perovskite oxide thin films by anisotropic strain engineering

Perspective: Strongly correlated and topological states in [111] grown transition metal oxide thin films and heterostructures

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Product

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Effect of (1 1 1)-oriented strain on the structure and magnetic properties of La_0.7Sr_0.3MnO₃ thin films

Effect of (1 1 1)-oriented strain on the structure and magnetic properties of La_0.7Sr_0.3MnO₃ thin films