Doubling the critical temperature of La1.9Sr0.1CuO4 using epitaxial strain

Locquet, Jean‐Pierre; Perret, J.; Fompeyrine, J.; Machler, E; Seo, Jin Won; Tendeloo, Gustaaf Van

doi:10.1038/28810

Cited by 623 publications

(446 citation statements)

References 28 publications

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“…A possible explanation is that LSCO films on SLAO have a larger c-axis lattice parameter and hence also a larger copper to apical-oxygen distance than what is found in bulk crystals [44,45]. As a consequence, the d z 2 states are less relevant and hence lead to a less pronounced zone-boundary dispersion.…”

Section: Discussionmentioning

confidence: 98%

Damped spin excitations in a doped cuprate superconductor with orbital hybridization

Ivashko

Shaik

et al. 2017

Phys. Rev. B

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A resonant inelastic x-ray scattering study of overdamped spin excitations in slightly underdoped La 2−x Sr x CuO 4 (LSCO) with x = 0.12 and 0.145 is presented. Three high-symmetry directions have been investigated: (1) the antinodal (0,0) → ( 1 2 ,0), (2) the nodal (0,0) → ( 1 4 , 1 4 ), and (3) the zone-boundary direction ( 1 2 ,0) → ( 1 4 , 1 4 ) connecting these two. The overdamped excitations exhibit strong dispersions along (1) and (3), whereas a much more modest dispersion is found along (2). This is in strong contrast to the undoped compound La 2 CuO 4 (LCO) for which the strongest dispersions are found along (1) and (2). The t − t − t − U Hubbard model used to explain the excitation spectrum of LCO predicts-for constant U/t-that the dispersion along (3) scales with (t /t) 2 . However, the diagonal hopping t extracted on LSCO using single-band models is low (t /t ∼ −0.16) and decreasing with doping. We therefore invoked a two-orbital (d x 2 −y 2 and d z 2 ) model which implies that t is enhanced. This effect acts to enhance the zone-boundary dispersion within the Hubbard model. We thus conclude that hybridization of d x 2 −y 2 and d z 2 states has a significant impact on the zone-boundary dispersion in LSCO.

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Section: Discussionmentioning

confidence: 98%

Damped spin excitations in a doped cuprate superconductor with orbital hybridization

Ivashko

Shaik

et al. 2017

Phys. Rev. B

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“…Recent examples of such strain-functionality coupling include the control of metal-to-insulator transition temperature in VO2 5 and the insulator-tosuperconductor transition temperature in La1.9Sr0.1CuO4 6 . Going beyond the ability to effectively manipulate already existing physical properties of a given material, strain has also been shown to invoke entirely new exotic ground states such as ferroelectricity in SrTiO3 and increased ferroelectric polarization in BaTiO3, consistent with theoretical predictions [7][8][9] .…”

Section: Textmentioning

confidence: 99%

Strain-Engineered Oxygen Vacancies in CaMnO₃ Thin Films

et al. 2017

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We demonstrate a novel pathway to control and stabilize oxygen vacancies in complex transition-metal oxide thin films. Using atomic layer-by-layer pulsed laser deposition (PLD) from two separate targets, we synthesize high-quality singlecrystalline CaMnO 3 films with systematically varying oxygen vacancy defect formation energies as controlled by coherent tensile strain. The systematic increase of the oxygen vacancy content in CaMnO 3 as a function of applied in-plane strain is observed and confirmed experimentally using high-resolution soft X-ray absorption spectroscopy (XAS) in conjunction with bulk-sensitive hard X-ray photoemission spectroscopy (HAXPES). The relevant defect states in the densities of states are identified and the vacancy content in the films quantified using the combination of first-principles theory and core−hole multiplet calculations with holistic fitting. Our findings open up a promising avenue for designing and controlling new ionically active properties and functionalities of complex transition-metal oxides via strain-induced oxygen-vacancy formation and ordering.

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“…This has raised the importance of the structural topology for controlling the T c max in these materials. Indeed, recently it has been argued that electronic inhomogeneity controlled by organization of defects, lattice distortions, interface states, nanoscale phase separation in the layered oxides has substantial influence in the superconducting properties of cuprates [4][5][6][7][8][9]. This appears to be common to all layered superconductors as diborides [10][11][12][13] and more recently pnictides [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Soft x-ray absorption and high-resolution powder x-ray diffraction study of superconducting Ca La1−Ba1.75−La0.25+Cu3O system

Agrestini

Sanna

Zheng

et al. 2014

Journal of Physics and Chemistry of Solids

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Doubling the critical temperature of La1.9Sr0.1CuO4 using epitaxial strain

Cited by 623 publications

References 28 publications

Damped spin excitations in a doped cuprate superconductor with orbital hybridization

Damped spin excitations in a doped cuprate superconductor with orbital hybridization

Strain-Engineered Oxygen Vacancies in CaMnO₃ Thin Films

Soft x-ray absorption and high-resolution powder x-ray diffraction study of superconducting Ca La1−Ba1.75−La0.25+Cu3O system

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Doubling the critical temperature of La1.9Sr0.1CuO4 using epitaxial strain

Cited by 623 publications

References 28 publications

Damped spin excitations in a doped cuprate superconductor with orbital hybridization

Damped spin excitations in a doped cuprate superconductor with orbital hybridization

Strain-Engineered Oxygen Vacancies in CaMnO3 Thin Films

Soft x-ray absorption and high-resolution powder x-ray diffraction study of superconducting Ca La1−Ba1.75−La0.25+Cu3O system

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Strain-Engineered Oxygen Vacancies in CaMnO₃ Thin Films