Properties of 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>La</mml:mi><mml:mrow><mml:mn>0.7</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Ca</mml:mi><mml:mrow><mml:mn>0.3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>MnO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>
 under extreme tensile strain

Şen, Cengiz; Dagotto, Elbio

doi:10.1103/physrevb.102.035126

Cited by 9 publications

(3 citation statements)

References 42 publications

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“…Recent studies by our group analyzed double-exchange models for manganites [3,55], involving the two orbitals x 2 − y 2 and 3z 2 − r 2 and a classical spin representing the t 2g spin. For this reason, i.e.…”

Section: Zigzag States In Two-orbital Double-exchange Modelmentioning

confidence: 99%

“…Note that in Ref. [55], as well as in here, we included an easy-axis anisotropy −A i (S z i ) 2 , usually not employed in manganites, where the spin is the classical t 2g spin. The inter-orbital hoppings are different by a sign along the x-and y-axis when using a square lattice, with all the other values the same.…”

Section: Zigzag States In Two-orbital Double-exchange Modelmentioning

confidence: 99%

“…For the present study, we transformed the square lattice studied in Ref. [55] to the triangular lattice by simply adding an extra hopping along only one of the diagonals of the plaquettes (and we chose the hoppings of that diagonal to be the x-axis hoppings, again for mere simplicity). The resulting model, now on a triangular lattice after adding one plaquette diagonal, was studied by MC simulations.…”

Section: Zigzag States In Two-orbital Double-exchange Modelmentioning

confidence: 99%

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Oxygen magnetic polarization, nodes in spin density, and zigzag spin order in oxides

Lin,

Kaushal,

Şen

et al. 2021

Preprint

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Recent density functional theory (DFT) calculations for Ba2CoO4 (BCO) and neutron scattering experiments for SrRuO3 (SRO) have shown that oxygen develops a magnetic polarization. Moreover, DFT calculations for these compounds also unveiled unexpected nodes in the spin density, both along Co-O and Ru-O. For BCO, the overall antiferromagnetic state in its triangular lattice contains unusual zigzag spin patterns. Here, using simple model calculations supplemented by DFT we explain and extend these results. We predict that ligands that in principle should be spinless, such as O 2− , will develop a net polarization when they act as electronic bridges between transition metal (TM) spins ferromagnetically ordered, regardless of the number of intermediate ligand atoms. The reason is the hybridization between atoms and mobility of the electrons with spins opposite to those of the closest TM atoms. Moreover, for bonds with TMs antiferromagnetically ordered, counterintuitively our calculations show that oxygens should also have a net magnetization for the super-super-exchange cases TM-O-O-TM while for only one oxygen, as in Cu-O-Cu, the Opolarization should cancel. Our results for the TM antiferromagnetic case are more general: for an even number of ligands between antiparallel TM spins, all ligands will develop nonzero polarization albeit of opposite signs, while for an odd number of ligands only the central one will have zero net polarization while the rest will have a nonzero polarization. Our simple model also allows us to explain the presence of nodes based on the antibonding character of the dominant singly occupied molecular orbitals along the TM-O bonds. Finally, the zigzag pattern order becomes the ground state mainly due to the influence of the Hubbard U , that creates the moments, in combination with a robust easy-axis anisotropy that suppresses the competing 120 • degree antiferromagnetic order of a triangular lattice. Our predictions are generic and should be applicable to any other compound with characteristics similar to those of BCO and SRO.

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Section: Zigzag States In Two-orbital Double-exchange Modelmentioning

confidence: 99%

Section: Zigzag States In Two-orbital Double-exchange Modelmentioning

confidence: 99%

Section: Zigzag States In Two-orbital Double-exchange Modelmentioning

confidence: 99%

See 1 more Smart Citation

Oxygen magnetic polarization, nodes in spin density, and zigzag spin order in oxides

Lin,

Kaushal,

Şen

et al. 2021

Preprint

View full text Add to dashboard Cite

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Uniaxial Strain and Hydrostatic Pressure Engineering of the Hidden Magnetism in La_1–xCa_xMnO₃ (0 ≤ x ≤ 1/2) Thin Films

et al. 2022

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Here, using various substrates, we demonstrate that the in-plane uniaxial strain engineering can enhance the Jahn–Teller distortions and promote selective orbital occupancy to induce an emergent antiferromagnetic insulating (AFI) phase at x = 1/3 of La1–x Ca x MnO3. Such an AFI phase depends not only on the magnitude of epitaxial strain but also on the symmetry of the substrates. Using the large uniaxial strain imparted by DyScO3(001) substrate, the AFI ground state is achieved in a wide range of doping levels (0 ≤ x ≤ 1/2), leaving an extended AFI phase diagram. Moreover, it is found that hydrostatic pressure can tune the AFI phase back to a hidden ferromagnetic metallic phase, accompanied by the formation of accommodation strain. The coaction of the accommodation strain, uniaxial strain, and hydrostatic pressure produces complex phase competition and evolution, and the result may shed light on phase space control of other functional perovskites with the competing magnetic interactions.

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Stability of the interorbital-hopping mechanism for ferromagnetism in multi-orbital Hubbard models

et al. 2023

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The emergence of insulating ferromagnetic phase in iron oxychalcogenide chain system has been recently argued to be originated by interorbital hopping mechanism. However, the practical conditions for the stability of such mechanism still prevents the observation of ferromagnetic in many materials. Here, we study the stability range of such ferromagnetic phase under modifications in the crystal fields and electronic correlation strength, constructing a theoretical phase diagram. We find a rich emergence of phases, including a ferromagnetic Mott insulator, a ferromagnetic orbital-selective Mott phase, together with antiferromagnetic and ferromagnetic metallic states. We characterize the stability of the ferromagnetic regime in both the Mott insulator and the ferromagnetic orbital-selective Mott phase forms. We identify a large stability range in the phase diagram at both intermediate and strong electronic correlations, demonstrating the capability of the interorbital hopping mechanism in stabilizing ferromagnetic insulators. Our results may enable additional design strategies to expand the relatively small family of known ferromagnetic insulators.

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Properties of La0.7Ca0.3MnO3 under extreme tensile strain

Cited by 9 publications

References 42 publications

Oxygen magnetic polarization, nodes in spin density, and zigzag spin order in oxides

Oxygen magnetic polarization, nodes in spin density, and zigzag spin order in oxides

Uniaxial Strain and Hydrostatic Pressure Engineering of the Hidden Magnetism in La_1–xCa_xMnO₃ (0 ≤ x ≤ 1/2) Thin Films

Stability of the interorbital-hopping mechanism for ferromagnetism in multi-orbital Hubbard models

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Properties of La0.7Ca0.3MnO3 under extreme tensile strain

Cited by 9 publications

References 42 publications

Oxygen magnetic polarization, nodes in spin density, and zigzag spin order in oxides

Oxygen magnetic polarization, nodes in spin density, and zigzag spin order in oxides

Uniaxial Strain and Hydrostatic Pressure Engineering of the Hidden Magnetism in La1–xCaxMnO3 (0 ≤ x ≤ 1/2) Thin Films

Stability of the interorbital-hopping mechanism for ferromagnetism in multi-orbital Hubbard models

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Uniaxial Strain and Hydrostatic Pressure Engineering of the Hidden Magnetism in La_1–xCa_xMnO₃ (0 ≤ x ≤ 1/2) Thin Films