Intrinsic versus extrinsic orbital and electronic reconstructions at complex oxide interfaces

Green, Robert J.; Zabolotnyy, V. B.; Zwiebler, M.; Liao, Zhaoliang; Macke, S.; Sutarto, Ronny; He, Feizhou; Huijben, Mark; Rijnders, Guus; Koster, Gertjan; Geck, J.; Hinkov, V.; Sawatzky, G. A.

doi:10.1103/physrevmaterials.5.065004

Cited by 6 publications

(6 citation statements)

References 43 publications

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“…This condition coincides with our result that only samples above 5 uc LTO show clear FM behavior, assuming that the 2DEG spreads over 2 nm in ETO. [ 39–41,38,45 ] ETO becomes ferromagnetic because of the RKKY interactions between localized Eu spins and itinerant electrons at the Ti side.…”

Section: Discussionmentioning

confidence: 99%

“…This condition coincides with our result that only samples above 5 uc LTO show clear FM behavior, assuming that the 2DEG spreads over 2 nm in ETO. [39][40][41]38,45] ETO becomes ferromagnetic because of the RKKY interactions between localized Eu spins and itinerant electrons at the Ti side. Now, We suggest three possible sources of the hump-like magnetic behavior and the various AHE shapes we observe: intrinsic AHE from the Berry curvature, DMI, and extrinsic AHE.…”

Section: Magnetic Behaviors Of the 2degsmentioning

confidence: 99%

“…One could expect some Eu residing in the LTO region (green in Figure 1c) or La in the ETO region (red in Figure 1c). [45,54] Thus, they can act as localized magnetic moments due to spins on Eu on the LTO side or induced magnetic moments on Ti 3+ by La on the ETO side, and introduce extrinsic AHE. Our control experiments mentioned above, however, suggest that extrinsic AHE cannot play a major role in these samples.…”

Section: Magnetic Behaviors Of the 2degsmentioning

confidence: 99%

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Highly Tunable Ferromagnetic 2D Electron Gases at Oxide Interfaces

Shin

Liu

Godin

et al. 2022

Adv Materials Inter

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the fundamental interest of exploring the spin degree of freedom in unusual electronic environments, but also for exploiting magnetism and spin currents in multifunctional devices. [7,8] Ongoing studies of magnetic 2DEGs focus on novel applications, as well as the search for new magnetic phenomena via, e.g., doping and charge transfer, or imposing epitaxial strain via growth on substrates with different crystal symmetries and lattice parameters. [9][10][11][12][13][14] LaTiO 3 (LTO) and EuTiO 3 (ETO) are two antiferromagnetic (AFM) insulating oxides possessing closely lattice-matched perovskite structures. Along the (001) direction, LTO has formally alternating charged layers (La 3+ O 2-/Ti 3+ O 2-2 ) and ETO has charge-neutral layers (Eu 2+ O 2-/ Ti 4+ O 2-2 ), thus the LTO/ETO interface has

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Section: Discussionmentioning

confidence: 99%

Section: Magnetic Behaviors Of the 2degsmentioning

confidence: 99%

Section: Magnetic Behaviors Of the 2degsmentioning

confidence: 99%

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Highly Tunable Ferromagnetic 2D Electron Gases at Oxide Interfaces

Shin

Liu

Godin

et al. 2022

Adv Materials Inter

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“…In spite of a lattice mismatch of 3%, the growth of SrTiO 3 on LaAlO 3 (or vice versa) is characterized by an epitaxial cube-on-cube orientation. , Furthermore, the combination of LaAlO 3 with SrTiO 3 in itself is of great interest due to the formation of a high-density, 2D conducting electron gas at the interface, although both perovskites on their own are insulating, nonmagnetic oxides . The magnetic properties and the 2D superconductivity of the LaAlO 3 /SrTiO 3 system are the subject of ongoing investigations. − The rare coexistence of ferromagnetism and superconductivity is of particular interest . A superconducting state similar to that found in LaAlO 3 /SrTiO 3 was recently also observed for the LaAlO 3 /KTaO 3 interface. − …”

Section: Lanthanum Monoaluminate (Lma)mentioning

confidence: 99%

La-Doped Alumina, Lanthanum Aluminate, Lanthanum Hexaaluminate, and Related Compounds: A Review Covering Synthesis, Structure, and Practical Importance

Heveling

2023

Ind. Eng. Chem. Res.

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Advanced materials based on lanthanum–aluminum oxides are useful for many practical applications, not the least in catalysis, energy conversion and energy storage systems designed for a sustainable world economy. The three main La–Al–O (LAO) combinations of commercial interest are La-doped aluminas (LDA), lanthanum monoaluminate (LMA, a perovskite), and lanthanum hexaaluminate (LHA). Usually, the literature treats doped aluminas, perovskites, and hexaaluminates separately. The current review tries to identify common trends and features with respect to structure, synthesis, and applications of LAOs, which should lead to a more holistic understanding of their chemistry. This, in turn, should trigger innovative ideas with respect to new or improved applications. Apart from a variety of uses at low temperatures, the main advantages of LDA, LMA, LHA, and related compounds are their high-temperature stability and the extended applicability that comes with it.

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“…For example, the heterostructure based on wide band-gap perovskite oxides can exhibit superconductivity, electric-field controlled conductivity, and magnetism at the interface (3; 4; 5; 6; 7). One of the main reason behind the emergence of novel phases in the heterostructure is based on the orbital reconstruction, charge transfer and defect present at the interface (8). In case of LAO/STO heterostructure, the counterpart of the 2DEG was completely discarded by Ohtomo & Hwang.…”

Section: Introductionmentioning

confidence: 99%

Emergent Phenomena in KTaO₃/SrTiO₃ Heterostructure

Bhattacharya

Jena

Datta

2023

J. Phys.: Conf. Ser.

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KTaO3 has become a new material of attraction for exploring various exotic properties at its surface and interfaces. To explore the substrate effect of KTaO3, we have studied a new heterostructure made by KTaO3 and SrTiO3. KTaO3 is a 5d polar perovskite with the complementary planes of KO− and TaO 2 + , whereas SrTiO3 is a 3d non-polar perovskite with alternative stacking SrO0 and TiO 2 0 . By taking the epitaxial layers of SrTiO3 on top of KTaO3, we have created two different interfaces along (0 0 1), which are KO − / TiO 2 0 and TaO 2 + / SrO 0 . We have studied these two interfaces by using density functional theory. In KO − / TiO 2 0 interface, the signature of two-dimensional hole gas (2DHG) has been found. Though the interface turns to insulator when epitaxial layers reach beyond 4.5 u.c. The other one, i.e., TaO 2 + / SrO 0 interface, shows the typical behaviour of two-dimensional electron gas (2DEG), only at the epitaxial layer 2.5 uc. The presence of both types of carriers in a single system for different kinds of interfaces has great use in various device applications.

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Intrinsic versus extrinsic orbital and electronic reconstructions at complex oxide interfaces

Cited by 6 publications

References 43 publications

Highly Tunable Ferromagnetic 2D Electron Gases at Oxide Interfaces

Highly Tunable Ferromagnetic 2D Electron Gases at Oxide Interfaces

La-Doped Alumina, Lanthanum Aluminate, Lanthanum Hexaaluminate, and Related Compounds: A Review Covering Synthesis, Structure, and Practical Importance

Emergent Phenomena in KTaO₃/SrTiO₃ Heterostructure

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Intrinsic versus extrinsic orbital and electronic reconstructions at complex oxide interfaces

Cited by 6 publications

References 43 publications

Highly Tunable Ferromagnetic 2D Electron Gases at Oxide Interfaces

Highly Tunable Ferromagnetic 2D Electron Gases at Oxide Interfaces

La-Doped Alumina, Lanthanum Aluminate, Lanthanum Hexaaluminate, and Related Compounds: A Review Covering Synthesis, Structure, and Practical Importance

Emergent Phenomena in KTaO3/SrTiO3 Heterostructure

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Emergent Phenomena in KTaO₃/SrTiO₃ Heterostructure