Magnetic and electronic properties at the γ-Al2O3/SrTiO3 interface

J. R. L. Mardegan, D. V. Christensen*, Y. Z. Chen, S. Parchenko, S. R. Avula, N. Ortiz-Hernandez, M. Decker, C. Piamonteze, N. Pryds, U. Staub

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

76 Downloads (Pure)

Abstract

The magnetic and electronic nature of the γ-Al2O3/SrTiO3 spinel/perovskite interface is explored by means of x-ray absorption spectroscopy. Polarized x-ray techniques combined with atomic multiplet calculations reveal localized magnetic moments assigned to Ti3+ at the interface with equivalent size for in- and out-of-plane magnetic field directions. Although magnetic fingerprints are revealed, the Ti3+ magnetism can be explained by a paramagnetic response at low temperature under applied magnetic fields. Modeling the x-ray linear dichroism results in a Δ0 ∼ to 1.9 eV splitting between the t(2g) and e(g) states for the Ti4+ 3d(0) orbitals. In addition these results indicate that the lowest energy states have the out-of-plane d(xz)/d(yz) symmetry. The isotropic magnetic moment behavior and the lowest energy states d(xz)/d(yz) are in contrast to the observations for the two-dimensional electron gas at the perovskite/perovskite interface of LaAlO3/SrTiO3 that exhibits an anisotropic magnetic d(xy) ground state.
Original languageEnglish
Article number134423
JournalPhysical Review B
Volume99
Issue number13
Number of pages7
ISSN1098-0121
DOIs
Publication statusPublished - 2019

Cite this

Mardegan, J. R. L., Christensen, D. V., Chen, Y. Z., Parchenko, S., Avula, S. R., Ortiz-Hernandez, N., ... Staub, U. (2019). Magnetic and electronic properties at the γ-Al2O3/SrTiO3 interface. Physical Review B, 99(13), [134423]. https://doi.org/10.1103/PhysRevB.99.134423
Mardegan, J. R. L. ; Christensen, D. V. ; Chen, Y. Z. ; Parchenko, S. ; Avula, S. R. ; Ortiz-Hernandez, N. ; Decker, M. ; Piamonteze, C. ; Pryds, N. ; Staub, U. / Magnetic and electronic properties at the γ-Al2O3/SrTiO3 interface. In: Physical Review B. 2019 ; Vol. 99, No. 13.
@article{fe1e70f9aecc4dcb8c0e95b68658063c,
title = "Magnetic and electronic properties at the γ-Al2O3/SrTiO3 interface",
abstract = "The magnetic and electronic nature of the γ-Al2O3/SrTiO3 spinel/perovskite interface is explored by means of x-ray absorption spectroscopy. Polarized x-ray techniques combined with atomic multiplet calculations reveal localized magnetic moments assigned to Ti3+ at the interface with equivalent size for in- and out-of-plane magnetic field directions. Although magnetic fingerprints are revealed, the Ti3+ magnetism can be explained by a paramagnetic response at low temperature under applied magnetic fields. Modeling the x-ray linear dichroism results in a Δ0 ∼ to 1.9 eV splitting between the t(2g) and e(g) states for the Ti4+ 3d(0) orbitals. In addition these results indicate that the lowest energy states have the out-of-plane d(xz)/d(yz) symmetry. The isotropic magnetic moment behavior and the lowest energy states d(xz)/d(yz) are in contrast to the observations for the two-dimensional electron gas at the perovskite/perovskite interface of LaAlO3/SrTiO3 that exhibits an anisotropic magnetic d(xy) ground state.",
author = "Mardegan, {J. R. L.} and Christensen, {D. V.} and Chen, {Y. Z.} and S. Parchenko and Avula, {S. R.} and N. Ortiz-Hernandez and M. Decker and C. Piamonteze and N. Pryds and U. Staub",
year = "2019",
doi = "10.1103/PhysRevB.99.134423",
language = "English",
volume = "99",
journal = "Physical Review B (Condensed Matter and Materials Physics)",
issn = "1098-0121",
publisher = "American Physical Society",
number = "13",

}

Mardegan, JRL, Christensen, DV, Chen, YZ, Parchenko, S, Avula, SR, Ortiz-Hernandez, N, Decker, M, Piamonteze, C, Pryds, N & Staub, U 2019, 'Magnetic and electronic properties at the γ-Al2O3/SrTiO3 interface', Physical Review B, vol. 99, no. 13, 134423. https://doi.org/10.1103/PhysRevB.99.134423

Magnetic and electronic properties at the γ-Al2O3/SrTiO3 interface. / Mardegan, J. R. L.; Christensen, D. V.; Chen, Y. Z.; Parchenko, S.; Avula, S. R.; Ortiz-Hernandez, N.; Decker, M.; Piamonteze, C.; Pryds, N.; Staub, U.

In: Physical Review B, Vol. 99, No. 13, 134423, 2019.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Magnetic and electronic properties at the γ-Al2O3/SrTiO3 interface

AU - Mardegan, J. R. L.

AU - Christensen, D. V.

AU - Chen, Y. Z.

AU - Parchenko, S.

AU - Avula, S. R.

AU - Ortiz-Hernandez, N.

AU - Decker, M.

AU - Piamonteze, C.

AU - Pryds, N.

AU - Staub, U.

PY - 2019

Y1 - 2019

N2 - The magnetic and electronic nature of the γ-Al2O3/SrTiO3 spinel/perovskite interface is explored by means of x-ray absorption spectroscopy. Polarized x-ray techniques combined with atomic multiplet calculations reveal localized magnetic moments assigned to Ti3+ at the interface with equivalent size for in- and out-of-plane magnetic field directions. Although magnetic fingerprints are revealed, the Ti3+ magnetism can be explained by a paramagnetic response at low temperature under applied magnetic fields. Modeling the x-ray linear dichroism results in a Δ0 ∼ to 1.9 eV splitting between the t(2g) and e(g) states for the Ti4+ 3d(0) orbitals. In addition these results indicate that the lowest energy states have the out-of-plane d(xz)/d(yz) symmetry. The isotropic magnetic moment behavior and the lowest energy states d(xz)/d(yz) are in contrast to the observations for the two-dimensional electron gas at the perovskite/perovskite interface of LaAlO3/SrTiO3 that exhibits an anisotropic magnetic d(xy) ground state.

AB - The magnetic and electronic nature of the γ-Al2O3/SrTiO3 spinel/perovskite interface is explored by means of x-ray absorption spectroscopy. Polarized x-ray techniques combined with atomic multiplet calculations reveal localized magnetic moments assigned to Ti3+ at the interface with equivalent size for in- and out-of-plane magnetic field directions. Although magnetic fingerprints are revealed, the Ti3+ magnetism can be explained by a paramagnetic response at low temperature under applied magnetic fields. Modeling the x-ray linear dichroism results in a Δ0 ∼ to 1.9 eV splitting between the t(2g) and e(g) states for the Ti4+ 3d(0) orbitals. In addition these results indicate that the lowest energy states have the out-of-plane d(xz)/d(yz) symmetry. The isotropic magnetic moment behavior and the lowest energy states d(xz)/d(yz) are in contrast to the observations for the two-dimensional electron gas at the perovskite/perovskite interface of LaAlO3/SrTiO3 that exhibits an anisotropic magnetic d(xy) ground state.

U2 - 10.1103/PhysRevB.99.134423

DO - 10.1103/PhysRevB.99.134423

M3 - Journal article

VL - 99

JO - Physical Review B (Condensed Matter and Materials Physics)

JF - Physical Review B (Condensed Matter and Materials Physics)

SN - 1098-0121

IS - 13

M1 - 134423

ER -