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Nature of the charge carriers in LaAlO3-SrTiO(3 )oxide heterostructures probed using hard X-ray photoelectron spectroscopy

Mukherjee, Sumanta and Pal, Banabir and Sarkar, Indranil and van Roekeghem, Ambroise and Drube, Wolfgang and Takagi, H and Matsuno, Jobu and Biermann, Silke and Sarma, DD (2018) Nature of the charge carriers in LaAlO3-SrTiO(3 )oxide heterostructures probed using hard X-ray photoelectron spectroscopy. In: EPL, 123 (4).

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Official URL: https://doi.org/10.1209/0295-5075/123/47003

Abstract

proper investigation of the valence band electronic structure is the essential first step towards understanding the intriguing co-existence of several exotic electronic phases like ferromagnetism and superconductivity, in LaAlO3-SrTiO3 heterostructures. In order to comprehend the electronic structure across the LaAlO3-SrTiO3 oxide interface, a detailed valence band investigation has been carried out using variable energy hard X-ray photoelectron spectroscopy and signatures of both low-energy coherent and high-energy features have been observed in the valence band spectra. Our combined experimental and theoretical study suggests that the charge carriers at the interface are weakly correlated and the high-energy feature does not arise from the lower Hubbard band. Instead, this high-energy feature is attributed to in-gap states induced by oxygen vacancies and possible polaron formation. Copyright (C) EPLA, 2018

Item Type: Journal Article
Additional Information: Copyright of the article belongs to IOP PUBLISHING LTD
Keywords: ELECTRONIC-STRUCTURE; INTERFACES; SRTIO3; SUPERCONDUCTIVITY; SYSTEMS; GAS
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Depositing User: LIS Interns
Date Deposited: 27 May 2019 06:22
Last Modified: 27 May 2019 06:22
URI: http://eprints.iisc.ac.in/id/eprint/62754

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