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Understanding interfacial conductance in non-stoichimetric Ca x Ta y O3− δ /SrTiO3.

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Title: Understanding interfacial conductance in non-stoichimetric Ca x Ta y O3− δ /SrTiO3.
Authors: Kumar, Sumit1,2 (AUTHOR), Nehra, Simran1,2 (AUTHOR), Shrivastava, Shikha1,2 (AUTHOR), Rathi, A1,2 (AUTHOR), Maurya, K K1,2 (AUTHOR), Ojha, Sunil3 (AUTHOR), Chhillar, Sonu4 (AUTHOR), Yadav, C S4 (AUTHOR), Chawla, Vipin5 (AUTHOR), Dogra, Anjana1,2 (AUTHOR) anjanad@nplindia.org
Source: Journal of Physics D: Applied Physics. 2/2/2024, Vol. 57 Issue 5, p1-8. 8p.
Subjects: Pulsed laser deposition, Two-dimensional electron gas, Heterojunctions, Thin films, Charge measurement, Energy density
Abstract: In search of novel conducting oxide heterointerfaces, we previously uncovered an distinctive quasi two-dimensional electron gas (q-2DEG) type behaviour in non-stoichimetric CaxTayO3-δ/SrTiO3 heterostructure. However, the underlying mechanism remained enigmatic. In this study, we delve into the intricate interplay of growth conditions, stoichiometry, and transport properties of these heterostructures. Using (Ca0.5TaO3)2 Target and the pulsed laser deposition technique, we grow the epitaxial thin films while systematically varying growth parameters, inculding laser energy density, oxygen pressures, and post-deposition annealing. Structural analysis unveiled a notable presence of oxygen vacancies in the as-grown films, while annealed samples exhibited an oxygen surplus. Building upon these findings, our comprehensive charge transport measurements revealed that while oxygen vacancies do contribute to conductivity, the polar catastrophe model takes precedence as the primary source of interfacial conductance in these heterostructures. This study provides valueable insights into the behavior of these innovative heterostructures, paving the way for future advancements in the field. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Physics D: Applied Physics is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 173433227
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PubType: Academic Journal
PubTypeId: academicJournal
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IllustrationInfo
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  Data: Understanding interfacial conductance in non-stoichimetric Ca <subscript>x</subscript> Ta <subscript>y</subscript> O<subscript>3− δ </subscript>/SrTiO<subscript>3</subscript>.
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  Data: <searchLink fieldCode="AR" term="%22Kumar%2C+Sumit%22">Kumar, Sumit</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nehra%2C+Simran%22">Nehra, Simran</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Shrivastava%2C+Shikha%22">Shrivastava, Shikha</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rathi%2C+A%22">Rathi, A</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Maurya%2C+K+K%22">Maurya, K K</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ojha%2C+Sunil%22">Ojha, Sunil</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chhillar%2C+Sonu%22">Chhillar, Sonu</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yadav%2C+C+S%22">Yadav, C S</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chawla%2C+Vipin%22">Chawla, Vipin</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dogra%2C+Anjana%22">Dogra, Anjana</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> anjanad@nplindia.org</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Physics+D%3A+Applied+Physics%22">Journal of Physics D: Applied Physics</searchLink>. 2/2/2024, Vol. 57 Issue 5, p1-8. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Pulsed+laser+deposition%22">Pulsed laser deposition</searchLink><br /><searchLink fieldCode="DE" term="%22Two-dimensional+electron+gas%22">Two-dimensional electron gas</searchLink><br /><searchLink fieldCode="DE" term="%22Heterojunctions%22">Heterojunctions</searchLink><br /><searchLink fieldCode="DE" term="%22Thin+films%22">Thin films</searchLink><br /><searchLink fieldCode="DE" term="%22Charge+measurement%22">Charge measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Energy+density%22">Energy density</searchLink>
– Name: Abstract
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  Data: In search of novel conducting oxide heterointerfaces, we previously uncovered an distinctive quasi two-dimensional electron gas (q-2DEG) type behaviour in non-stoichimetric CaxTayO3-δ/SrTiO3 heterostructure. However, the underlying mechanism remained enigmatic. In this study, we delve into the intricate interplay of growth conditions, stoichiometry, and transport properties of these heterostructures. Using (Ca0.5TaO3)2 Target and the pulsed laser deposition technique, we grow the epitaxial thin films while systematically varying growth parameters, inculding laser energy density, oxygen pressures, and post-deposition annealing. Structural analysis unveiled a notable presence of oxygen vacancies in the as-grown films, while annealed samples exhibited an oxygen surplus. Building upon these findings, our comprehensive charge transport measurements revealed that while oxygen vacancies do contribute to conductivity, the polar catastrophe model takes precedence as the primary source of interfacial conductance in these heterostructures. This study provides valueable insights into the behavior of these innovative heterostructures, paving the way for future advancements in the field. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Physics D: Applied Physics is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1088/1361-6463/acfcc5
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        Text: English
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    Subjects:
      – SubjectFull: Pulsed laser deposition
        Type: general
      – SubjectFull: Two-dimensional electron gas
        Type: general
      – SubjectFull: Heterojunctions
        Type: general
      – SubjectFull: Thin films
        Type: general
      – SubjectFull: Charge measurement
        Type: general
      – SubjectFull: Energy density
        Type: general
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      – TitleFull: Understanding interfacial conductance in non-stoichimetric Ca x Ta y O3− δ /SrTiO3.
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              M: 02
              Text: 2/2/2024
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