Metal-insulator transition at a depleted LaAlO3/SrTiO 3 interface: Evidence for charge transfer induced by SrTiO 3 phase transitions

W. M. Lü; X. Wang; Z. Q. Liu; S. Dhar; A. Annadi; K. Gopinadhan; Roy Barman A; H. B. Su; T. Venkatesan; Ariando

doi:10.1063/1.3656703

Metal-insulator transition at a depleted LaAlO₃/SrTiO ₃ interface: Evidence for charge transfer induced by SrTiO ₃ phase transitions

W. M. Lü^*
, X. Wang
, Z. Q. Liu
, S. Dhar
, A. Annadi
, K. Gopinadhan
, Roy Barman A
, H. B. Su
, T. Venkatesan
, Ariando

^*Corresponding author for this work

National University of Singapore
Nanyang Technological University

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

Two anomalous bias dependent resistive peaks induced by the SrTiO ₃ structural phase transitions at 55 and 110 K were observed in a LaAlO₃/SrTiO₃ and Nb:SrTiO₃ rectifying junction when the LaAlO₃/SrTiO₃ was depleted under reverse bias. At these transition temperatures, the barrier between LaAlO₃/ SrTiO₃ and Nb:SrTiO₃ showed abrupt changes in the tunneling energy under forward bias. The peak at 110 K was an insulator-metal phase transition while the peak at 55 K was a metal-insulator one. We propose that the phase transitions of the SrTiO₃ substrate influence the charge transfer to the LaAlO₃/SrTiO₃ layer, giving rise to these anomalous resistive peaks.

Original language	English
Article number	172103
Journal	Applied Physics Letters
Volume	99
Issue number	17
DOIs	https://doi.org/10.1063/1.3656703
State	Published - 24 Oct 2011
Externally published	Yes

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title = "Metal-insulator transition at a depleted LaAlO3/SrTiO 3 interface: Evidence for charge transfer induced by SrTiO 3 phase transitions",

abstract = "Two anomalous bias dependent resistive peaks induced by the SrTiO 3 structural phase transitions at 55 and 110 K were observed in a LaAlO3/SrTiO3 and Nb:SrTiO3 rectifying junction when the LaAlO3/SrTiO3 was depleted under reverse bias. At these transition temperatures, the barrier between LaAlO3/ SrTiO3 and Nb:SrTiO3 showed abrupt changes in the tunneling energy under forward bias. The peak at 110 K was an insulator-metal phase transition while the peak at 55 K was a metal-insulator one. We propose that the phase transitions of the SrTiO3 substrate influence the charge transfer to the LaAlO3/SrTiO3 layer, giving rise to these anomalous resistive peaks.",

author = "L{\"u}, \{W. M.\} and X. Wang and Liu, \{Z. Q.\} and S. Dhar and A. Annadi and K. Gopinadhan and \{Barman A\}, Roy and Su, \{H. B.\} and T. Venkatesan and Ariando",

year = "2011",

month = oct,

day = "24",

doi = "10.1063/1.3656703",

language = "英语",

volume = "99",

journal = "Applied Physics Letters",

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TY - JOUR

T1 - Metal-insulator transition at a depleted LaAlO3/SrTiO 3 interface

T2 - Evidence for charge transfer induced by SrTiO 3 phase transitions

AU - Lü, W. M.

AU - Wang, X.

AU - Liu, Z. Q.

AU - Dhar, S.

AU - Annadi, A.

AU - Gopinadhan, K.

AU - Barman A, Roy

AU - Su, H. B.

AU - Venkatesan, T.

AU - Ariando,

PY - 2011/10/24

Y1 - 2011/10/24

N2 - Two anomalous bias dependent resistive peaks induced by the SrTiO 3 structural phase transitions at 55 and 110 K were observed in a LaAlO3/SrTiO3 and Nb:SrTiO3 rectifying junction when the LaAlO3/SrTiO3 was depleted under reverse bias. At these transition temperatures, the barrier between LaAlO3/ SrTiO3 and Nb:SrTiO3 showed abrupt changes in the tunneling energy under forward bias. The peak at 110 K was an insulator-metal phase transition while the peak at 55 K was a metal-insulator one. We propose that the phase transitions of the SrTiO3 substrate influence the charge transfer to the LaAlO3/SrTiO3 layer, giving rise to these anomalous resistive peaks.

AB - Two anomalous bias dependent resistive peaks induced by the SrTiO 3 structural phase transitions at 55 and 110 K were observed in a LaAlO3/SrTiO3 and Nb:SrTiO3 rectifying junction when the LaAlO3/SrTiO3 was depleted under reverse bias. At these transition temperatures, the barrier between LaAlO3/ SrTiO3 and Nb:SrTiO3 showed abrupt changes in the tunneling energy under forward bias. The peak at 110 K was an insulator-metal phase transition while the peak at 55 K was a metal-insulator one. We propose that the phase transitions of the SrTiO3 substrate influence the charge transfer to the LaAlO3/SrTiO3 layer, giving rise to these anomalous resistive peaks.

UR - https://www.scopus.com/pages/publications/80555129541

U2 - 10.1063/1.3656703

DO - 10.1063/1.3656703

M3 - 文章

AN - SCOPUS:80555129541

SN - 0003-6951

VL - 99

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 17

M1 - 172103

ER -

Metal-insulator transition at a depleted LaAlO3/SrTiO 3 interface: Evidence for charge transfer induced by SrTiO 3 phase transitions

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Metal-insulator transition at a depleted LaAlO₃/SrTiO ₃ interface: Evidence for charge transfer induced by SrTiO ₃ phase transitions