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Title: Tunable spin polarization and superconductivity in engineered oxide interfaces

Abstract

Advances in growth technology of oxide materials allow single atomic layer control of heterostructures. In particular delta doping, a key materials’ engineering tool in today’s semiconductor technology, is now also available for oxides. Here we show that a fully electric-field-tunable spin-polarized and superconducting quasi-2D electron system (q2DES) can be artificially created by inserting a few unit cells of delta doping EuTiO 3 at the interface between LaAlO 3 and SrTiO 3 oxides. Spin polarization emerges below the ferromagnetic transition temperature of the EuTiO 3 layer (T FM = 6–8 K) and is due to the exchange interaction between the magnetic moments of Eu-4 f and of Ti-3 d electrons. Moreover, in a large region of the phase diagram, superconductivity sets in from a ferromagnetic normal state. As a result, the occurrence of magnetic interactions, superconductivity and spin–orbit coupling in the same q2DES makes the LaAlO 3/EuTiO 3/SrTiO 3 system an intriguing platform for the emergence of novel quantum phases in low-dimensional materials.

Authors:
 [1];  [2];  [1];  [1]; ORCiD logo [1]; ORCiD logo [3];  [4];  [5]; ORCiD logo [1];  [6];  [5];  [7];  [8];  [9]; ORCiD logo [6]
  1. Univ. di Napoli "Federico II", Napoli (Italy); CNR-SPIN, Napoli (Italy)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Politecnico di Milano, Milano (Italy)
  4. Univ. Montpellier, Montpellier (France)
  5. Univ. di Genova, Genova (Italy)
  6. CNR-SPIN, Napoli (Italy)
  7. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  8. Ecole Polytechnique Federale Lausanne, Lausanne (Switzlerland)
  9. CNR-SPIN, Napoli (Italy); Seconda Univ. degli Studi di Napoli (SUN), Aversa (Italy)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1362205
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Nature Materials
Additional Journal Information:
Journal Volume: 15; Journal Issue: 3; Journal ID: ISSN 1476-1122
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Stornaiuolo, Daniela, Cantoni, C., De Luca, G. M., Di Capua, R., Gennaro, E. Di., Ghiringhelli, G., Jouault, B., Marre, D., Massarotti, D., Granozio, F. Miletto, Pallecchi, I., Piamonteze, C., Rusponi, S., Tafuri, F., and Salluzzo, Marco. Tunable spin polarization and superconductivity in engineered oxide interfaces. United States: N. p., 2015. Web. doi:10.1038/nmat4491.
Stornaiuolo, Daniela, Cantoni, C., De Luca, G. M., Di Capua, R., Gennaro, E. Di., Ghiringhelli, G., Jouault, B., Marre, D., Massarotti, D., Granozio, F. Miletto, Pallecchi, I., Piamonteze, C., Rusponi, S., Tafuri, F., & Salluzzo, Marco. Tunable spin polarization and superconductivity in engineered oxide interfaces. United States. doi:10.1038/nmat4491.
Stornaiuolo, Daniela, Cantoni, C., De Luca, G. M., Di Capua, R., Gennaro, E. Di., Ghiringhelli, G., Jouault, B., Marre, D., Massarotti, D., Granozio, F. Miletto, Pallecchi, I., Piamonteze, C., Rusponi, S., Tafuri, F., and Salluzzo, Marco. Mon . "Tunable spin polarization and superconductivity in engineered oxide interfaces". United States. doi:10.1038/nmat4491.
@article{osti_1362205,
title = {Tunable spin polarization and superconductivity in engineered oxide interfaces},
author = {Stornaiuolo, Daniela and Cantoni, C. and De Luca, G. M. and Di Capua, R. and Gennaro, E. Di. and Ghiringhelli, G. and Jouault, B. and Marre, D. and Massarotti, D. and Granozio, F. Miletto and Pallecchi, I. and Piamonteze, C. and Rusponi, S. and Tafuri, F. and Salluzzo, Marco},
abstractNote = {Advances in growth technology of oxide materials allow single atomic layer control of heterostructures. In particular delta doping, a key materials’ engineering tool in today’s semiconductor technology, is now also available for oxides. Here we show that a fully electric-field-tunable spin-polarized and superconducting quasi-2D electron system (q2DES) can be artificially created by inserting a few unit cells of delta doping EuTiO3 at the interface between LaAlO3 and SrTiO3 oxides. Spin polarization emerges below the ferromagnetic transition temperature of the EuTiO3 layer (TFM = 6–8 K) and is due to the exchange interaction between the magnetic moments of Eu-4f and of Ti-3d electrons. Moreover, in a large region of the phase diagram, superconductivity sets in from a ferromagnetic normal state. As a result, the occurrence of magnetic interactions, superconductivity and spin–orbit coupling in the same q2DES makes the LaAlO3/EuTiO3/SrTiO3 system an intriguing platform for the emergence of novel quantum phases in low-dimensional materials.},
doi = {10.1038/nmat4491},
journal = {Nature Materials},
issn = {1476-1122},
number = 3,
volume = 15,
place = {United States},
year = {2015},
month = {12}
}

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