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Possible Mechanisms of Electronic Phase Separation in Oxide Interfaces

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Abstract

LaAlO 3/SrTiO 3 and LaTiO 3/SrTiO 3 (LXO / STO) interfaces are known to host a strongly inhomogeneous (nearly) two-dimensional electron gas (2DEG). In this work, we present three unconventional electronic mechanisms of electronic phase separation (EPS) in a 2DEG as a possible source of inhomogeneity in oxide interfaces. Common to all three mechanisms is the dependence of some (interaction) potential on the 2DEGs density. We first consider a mechanism resulting from a sizable density-dependent Rashba spin-orbit coupling. Next, we point out that an EPS may also occur in the case of a density-dependent superconducting pairing interaction. Finally, we show that the confinement of the 2DEG to the interface by a density-dependent, self-consistent electrostatic potential can by itself cause an EPS.

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Authors and Affiliations

  1. Dipartimento di Fisica, Università di Roma Sapienza, Piazzale Aldo Moro 5, 00185, Roma, Italy

    N. Bovenzi, F. Finocchiaro, N. Scopigno, D. Bucheli, S. Caprara & M. Grilli

  2. Institut für Physik, BTU Cottbus-Senftenberg, P.O. Box 101344, 03013, Cottbus, Germany

    G. Seibold

Authors
  1. N. Bovenzi
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  2. F. Finocchiaro
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  3. N. Scopigno
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  4. D. Bucheli
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  5. S. Caprara
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  6. G. Seibold
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  7. M. Grilli
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Correspondence to M. Grilli.

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Bovenzi, N., Finocchiaro, F., Scopigno, N. et al. Possible Mechanisms of Electronic Phase Separation in Oxide Interfaces. J Supercond Nov Magn 28, 1273–1277 (2015). https://doi.org/10.1007/s10948-014-2903-7

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  • DOI: https://doi.org/10.1007/s10948-014-2903-7

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