Lanthanide gallate perovskite-type substrates for epitaxial, high-Tc superconducting Ba2YCu3O7-δ films

Giess, E. A.; Sandstrom, R. L.; Gallagher, W. J.; Gupta, Arunava; Shindé, Subhash L.; Cooper, Emanuel I.; O’Sullivan, E. J.; Roldán, José Mena; Segmüller, Armin; Angilello, J.; Cook, Robert F.

doi:10.1147/rd.346.0916

Cited by 68 publications

(26 citation statements)

References 29 publications

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“…We calculate the lattice constant of STO to be 3.861 Å, in good agreement with previously reported experimental value of 3.905 Å 59 and a theoretical value of 3.918 Å. 60 At high temperature BTO is cubic, but at 393 K it transforms to a tetragonal ferroelectric phase.…”

Section: Computational Detailssupporting

confidence: 88%

Switchable conductivity at the ferroelectric interface: Nonpolar oxides

Fredrickson

Demkov

2015

Phys. Rev. B

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We investigate theoretically the interface between a ferroelectric BaTiO 3 film and a non-polar insulating SrTiO 3 substrate. We find that thin BaTiO 3 (under 5 nm) can stabilize a non-polarized state, and an additional metastable polarized state. While the non-polarized state is insulating, for the polarized heterostructure, we discover the existence of two-dimensional charge carrier gases. In this case, the heterostructure undergoes an electronic reconstruction in order to prevent the polar catastrophe. The two-dimensional gases, formed as a result, screen the polarization, leading to a substantially reduced potential drop across the ferroelectric film. We emphasize that the twodimensional electron and hole gases are created by the polarization of the sample, and are not due to polar nature of the material or to doping.

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Section: Computational Detailssupporting

confidence: 88%

Switchable conductivity at the ferroelectric interface: Nonpolar oxides

Fredrickson

Demkov

2015

Phys. Rev. B

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“…The first order structural phase transition in LaGaO 3 , from orthorhombic Pbnm (Pnma in standard setting) to rhombohedral F32=n (R3c in standard setting) has been the subject of numerous studies in recent years [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. We make this choice of the rhombohedral space group setting as it allows ease of comparison with both the aristotype and hettotype phases of perovskitestructured phases that is not immediately apparent from the more commonly used primitive rhombohedral, or triply-primitive hexagonal settings.…”

Section: Introductionmentioning

confidence: 99%

Low temperature thermoelastic and structural properties of LaGaO3 perovskite in the Pbnm phase

Knight

2012

Journal of Solid State Chemistry

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“…It should be noted that although the coefficient of thermal expansion (CTE) for LaGaO 3 above the transition temperature provides an ideal lattice match for high temperature superconducting films, the presence of the disruptive low-temperature phase transition and a strong tendency for twinning restrict its wider application as a substrate material. 8,10 Two views exist on the possible reason for the formation of these twins in LaGaO 3 . According to some authors, 5,16 the LaGaO 3 crystals are heavily twinned in order to accommodate the strain originating from the first-order phase transition.…”

Section: Crystal Structurementioning

confidence: 99%

“…The indentation toughness of polycrystalline LSGM compositions was reported to be in the range of 0.9-1.1 MPa m 1/2 , while the hardness measured by indentation with a Vickers diamond pyramid was 7.0-8.2 GPa. 6,7 Giess et al 8 reported the indentation fracture toughness and Vickers hardness (H) values for single crystal LaGaO 3 as 0.7 MPa m 1/2 and 9.4 GPa, respectively. The authors also noted that the cracks tend to follow the cleavage planes in the crystal, and oriented the indentations as to yield cracks propagating collinearly with the contact impression diagonals.…”

Section: Introductionmentioning

confidence: 99%