Electronic phase separation at the LaAlO3/SrTiO3 interface

A. Ariando, A. Ariando, X. Wang, G. Baskaran, Z.Q. Liu, J. Huijben, J.B. Yi, A. Annadi, A. Roy Barman, A. Rusydi, S. Dhar, Y.P. Feng, J. Ding, Johannes W.M. Hilgenkamp, T. Venkatesan

Research output: Contribution to journalArticle

  • 189 Citations

Abstract

There are many electronic and magnetic properties exhibited by complex oxides. Electronic phase separation (EPS) is one of those, the presence of which can be linked to exotic behaviours, such as colossal magnetoresistance, metal–insulator transition and high-temperature superconductivity. A variety of new and unusual electronic phases at the interfaces between complex oxides, in particular between two non-magnetic insulators LaAlO3 and SrTiO3, have stimulated the oxide community. However, no EPS has been observed in this system despite a theoretical prediction. Here, we report an EPS state at the LaAlO3/SrTiO3 interface, where the interface charges are separated into regions of a quasi-two-dimensional electron gas, a ferromagnetic phase, which persists above room temperature, and a (superconductor like) diamagnetic/paramagnetic phase below 60 K. The EPS is due to the selective occupancy (in the form of 2D-nanoscopic metallic droplets) of interface sub-bands of the nearly degenerate Ti orbital in the SrTiO3. The observation of this EPS demonstrates the electronic and magnetic phenomena that can emerge at the interface between complex oxides mediated by the Ti orbital.
LanguageEnglish
Article number188
Pages188-
JournalNature communications
Volume2
Issue number188
DOIs
StatePublished - 2011

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Phase separation
Oxides
electronics
Magnetic Phenomena
oxides
Transition Temperature
Colossal magnetoresistance
Metal insulator transition
Two dimensional electron gas
Superconductivity
Electronic properties
Gases
Metals
Superconducting materials
Observation
insulators
Electrons
Magnetic properties
orbitals
Temperature

Keywords

  • IR-104385
  • METIS-280329

Cite this

Ariando, A., Ariando, A., Wang, X., Baskaran, G., Liu, Z. Q., Huijben, J., ... Venkatesan, T. (2011). Electronic phase separation at the LaAlO3/SrTiO3 interface. Nature communications, 2(188), 188-. [188]. DOI: 10.1038/ncomms1192
Ariando, A. ; Ariando, A. ; Wang, X. ; Baskaran, G. ; Liu, Z.Q. ; Huijben, J. ; Yi, J.B. ; Annadi, A. ; Barman, A. Roy ; Rusydi, A. ; Dhar, S. ; Feng, Y.P. ; Ding, J. ; Hilgenkamp, Johannes W.M. ; Venkatesan, T./ Electronic phase separation at the LaAlO3/SrTiO3 interface. In: Nature communications. 2011 ; Vol. 2, No. 188. pp. 188-
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Ariando, A, Ariando, A, Wang, X, Baskaran, G, Liu, ZQ, Huijben, J, Yi, JB, Annadi, A, Barman, AR, Rusydi, A, Dhar, S, Feng, YP, Ding, J, Hilgenkamp, JWM & Venkatesan, T 2011, 'Electronic phase separation at the LaAlO3/SrTiO3 interface' Nature communications, vol 2, no. 188, 188, pp. 188-. DOI: 10.1038/ncomms1192

Electronic phase separation at the LaAlO3/SrTiO3 interface. / Ariando, A.; Ariando, A.; Wang, X.; Baskaran, G.; Liu, Z.Q.; Huijben, J.; Yi, J.B.; Annadi, A.; Barman, A. Roy; Rusydi, A.; Dhar, S.; Feng, Y.P.; Ding, J.; Hilgenkamp, Johannes W.M.; Venkatesan, T.

In: Nature communications, Vol. 2, No. 188, 188, 2011, p. 188-.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Electronic phase separation at the LaAlO3/SrTiO3 interface

AU - Ariando,A.

AU - Ariando,A.

AU - Wang,X.

AU - Baskaran,G.

AU - Liu,Z.Q.

AU - Huijben,J.

AU - Yi,J.B.

AU - Annadi,A.

AU - Barman,A. Roy

AU - Rusydi,A.

AU - Dhar,S.

AU - Feng,Y.P.

AU - Ding,J.

AU - Hilgenkamp,Johannes W.M.

AU - Venkatesan,T.

PY - 2011

Y1 - 2011

N2 - There are many electronic and magnetic properties exhibited by complex oxides. Electronic phase separation (EPS) is one of those, the presence of which can be linked to exotic behaviours, such as colossal magnetoresistance, metal–insulator transition and high-temperature superconductivity. A variety of new and unusual electronic phases at the interfaces between complex oxides, in particular between two non-magnetic insulators LaAlO3 and SrTiO3, have stimulated the oxide community. However, no EPS has been observed in this system despite a theoretical prediction. Here, we report an EPS state at the LaAlO3/SrTiO3 interface, where the interface charges are separated into regions of a quasi-two-dimensional electron gas, a ferromagnetic phase, which persists above room temperature, and a (superconductor like) diamagnetic/paramagnetic phase below 60 K. The EPS is due to the selective occupancy (in the form of 2D-nanoscopic metallic droplets) of interface sub-bands of the nearly degenerate Ti orbital in the SrTiO3. The observation of this EPS demonstrates the electronic and magnetic phenomena that can emerge at the interface between complex oxides mediated by the Ti orbital.

AB - There are many electronic and magnetic properties exhibited by complex oxides. Electronic phase separation (EPS) is one of those, the presence of which can be linked to exotic behaviours, such as colossal magnetoresistance, metal–insulator transition and high-temperature superconductivity. A variety of new and unusual electronic phases at the interfaces between complex oxides, in particular between two non-magnetic insulators LaAlO3 and SrTiO3, have stimulated the oxide community. However, no EPS has been observed in this system despite a theoretical prediction. Here, we report an EPS state at the LaAlO3/SrTiO3 interface, where the interface charges are separated into regions of a quasi-two-dimensional electron gas, a ferromagnetic phase, which persists above room temperature, and a (superconductor like) diamagnetic/paramagnetic phase below 60 K. The EPS is due to the selective occupancy (in the form of 2D-nanoscopic metallic droplets) of interface sub-bands of the nearly degenerate Ti orbital in the SrTiO3. The observation of this EPS demonstrates the electronic and magnetic phenomena that can emerge at the interface between complex oxides mediated by the Ti orbital.

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KW - METIS-280329

U2 - 10.1038/ncomms1192

DO - 10.1038/ncomms1192

M3 - Article

VL - 2

SP - 188-

JO - Nature communications

T2 - Nature communications

JF - Nature communications

SN - 2041-1723

IS - 188

M1 - 188

ER -

Ariando A, Ariando A, Wang X, Baskaran G, Liu ZQ, Huijben J et al. Electronic phase separation at the LaAlO3/SrTiO3 interface. Nature communications. 2011;2(188):188-. 188. Available from, DOI: 10.1038/ncomms1192