Quantum confinement induced magnetism in LaNiO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>-LaMnO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>superlattices

Dong, Shuai; Dagotto, Elbio

doi:10.1103/physrevb.87.195116

Cited by 61 publications

(80 citation statements)

References 47 publications

(47 reference statements)

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“…This metal-insulator transition enriches the orientationdependent physics in oxide heterostructures. Many previous works have revealed plenty orientation-dependent physics of perovskite films/superlattices, e.g., magnetism [7][8][9][10]38], topological phase [39,40], as well as superconductivity [6]. The present study adds one more interesting topic.…”

Section: A2 Metal-insulator Transition and Orbital Orderingmentioning

confidence: 60%

“…Since only the change of Q1 is referable, the original Q1 of strained LaTiO3 is set as the reference. 8,37]. All these factors will contribute to the electronic reconstruction, which is a result of cooperative mechanisms.…”

Section: Resultsmentioning

confidence: 99%

“…Around the interfaces between oxides, both the lattice structure and electronic structure would be reconstructed, which co-determine emergent exotic physical properties. For example, the two-dimensional electronic gas between two insulators was found in LaAlO 3 /SrTiO 3 [5,6], and orientationdependent magnetism was observed in LaNiO 3 /LaMnO 3 [7,8] and LaFeO 3 /LaCrO 3 superlattices [9,10].…”

Section: Introductionmentioning

confidence: 99%

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(LaTiO3)n/(LaVO3)n as a model system for unconventional charge transfer and polar metallicity

et al. 2017

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At interfaces between oxide materials, lattice and electronic reconstructions always play important roles in exotic phenomena. In this study, the density functional theory and maximally localized Wannier functions are employed to investigate the (LaTiO3)n/(LaVO3)n magnetic superlattices. The electron transfer from Ti 3+ to V 3+ is predicted, which violates the intuitive band alignment based on the electronic structures of LaTiO3 and LaVO3. Such unconventional charge transfer quenches the magnetism of LaTiO3 layer mostly and leads to metal-insulator transition in the n = 1 superlattice when the stacking orientation is altered. In addition, the compatibility among the polar structure, ferrimagnetism, and metallicity is predicted in the n = 2 superlattice.

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Section: A2 Metal-insulator Transition and Orbital Orderingmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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(LaTiO3)n/(LaVO3)n as a model system for unconventional charge transfer and polar metallicity

et al. 2017

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“…Strain and pressure effects on magnetism and metal-insulator transition in LaMnO 3 (Refs. 39-42) and LaMnO 3 -based superlattices [43][44][45][46] have received considerable attention. In particular, previous first-principles studies of LaMnO 3 demonstrate electronic and magnetic phase transitions driven by uniaxial strain.…”

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confidence: 99%

Strong coupling of Jahn-Teller distortion to oxygen-octahedron rotation and functional properties in epitaxially strained orthorhombic LaMnO3

et al. 2013

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First-principles calculations reveal a large cooperative coupling of Jahn-Teller (JT) distortion to oxygenoctahedron rotations in perovskite LaMnO 3 . The combination of the two distortions is responsible for stabilizing the strongly orthorhombic A-AFM insulating (I ) eP bnm ground state relative to a metallic ferromagnetic (FM-M) phase. However, epitaxial strain due to coherent matching to a crystalline substrate can change the relative stability of the two states. In particular, coherent matching to a square-lattice substrate favors the less orthorhombic FM-M phase, with the A-AFM phase stabilized at higher values of tensile epitaxial strain due to its larger volume per formula unit, resulting in a coupled magnetic and metal-insulator transition at a critical strain close to 1%. At the phase boundary, a very large magnetoresistance is expected. Tensile epitaxial strain enhances the JT distortion and opens the band gap in the A-AFM-I c-eP bnm phase, offering the opportunity for band-gap engineering. Compressive epitaxial strain induces a transition within the FM-M phase from the c-eP bnm orientation to the ab-eP bnm orientation with a change in the direction of the magnetic easy axis relative to the substrate, yielding strain-controlled magnetization at the phase boundary. Similar behavior is expected in other JT active P bnm perovskites. (La,M)MnO 3 (M = Ca, Pr, Sr, Ba) has been of great interest due to the couplings among structure, magnetic and orbital orderings, and the resulting functional properties, such as colossal magneto-resistance (CMR). 1-4 As a result, there have been many experimental 5-8 and theoretical 9-25 studies of the end-member compound LaMnO 3 (LaMnO 3 ). The observed sequence of phases with decreasing temperature is as follows: 8,26 At very high temperature (above 1010 K), LaMnO 3 has a rhombohedral R3c structure, produced by rotation of the oxygen octahedron network of the ideal perovskite structure. From 1010 K down to 750 K, it has an orthorhombic P bnm structure produced by a different pattern of octahedral rotations. At 750 K, an orbital-order transition occurs by a cooperative Jahn-Teller transition; 27 however, this distortion does not break the symmetry of the P bnm structure. Finally, a magnetic transition to an A-type antiferromagnetic (A-AFM) ordering (ferromagnetic alignment in the xy planes, with spin direction alternating from plane to plane) occurs at 135 K.It proves to be challenging to reproduce the observed A-AFM ground state of LaMnO 3 , with its half filled e g level, from first principles. If the structural parameters are fixed to the experimental values, the correct magnetic ordering is obtained with a range of density-functional-theory (DFT) methods. However, full optimization of the structure within DFT generally gives a competing FM-M phase as the ground state, 11,17 and the correct ground state is obtained only in calculations with both a generalized gradient form of the density functional and inclusion of a Hubbard U . 16 More generally, various couplings in com...

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“…The most nontrivial physics is that the coordination numbers of Ti-O-Ti bonds are reduced to three, while the numbers of (001) bilayer are five. 20 To determine the ground state, several possible magnetic orders have been calculated, as sketched in Fig. 1(e).…”

mentioning

confidence: 99%

Magnetism and electronic structure of (001)- and (111)-oriented LaTiO3 bilayers sandwiched in LaScO3 barriers

Weng

Dong

2015

Journal of Applied Physics

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Quantum confinement induced magnetism in LaNiO3-LaMnO3superlattices

Cited by 61 publications

References 47 publications

(LaTiO3)n/(LaVO3)n as a model system for unconventional charge transfer and polar metallicity

(LaTiO3)n/(LaVO3)n as a model system for unconventional charge transfer and polar metallicity

Strong coupling of Jahn-Teller distortion to oxygen-octahedron rotation and functional properties in epitaxially strained orthorhombic LaMnO3

Magnetism and electronic structure of (001)- and (111)-oriented LaTiO3 bilayers sandwiched in LaScO3 barriers

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