Universal size-dependent nonlinear charge transport in single crystals of the Mott insulator Ca2RuO4

Abstract The surprisingly low current density required for inducing the insulator to metal transition has made Ca2RuO4 an attractive candidate material for developing Mott-based electronics devices. The mechanism driving the resistive switching, however, remains a controversial topic in the field of...

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Autores principales:	G. Avallone, R. Fermin, K. Lahabi, V. Granata, R. Fittipaldi, C. Cirillo, C. Attanasio, A. Vecchione, J. Aarts
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
Acceso en línea:	https://doaj.org/article/9801d00d5a81469483d4711b7a00d7b3
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spelling	oai:doaj.org-article:9801d00d5a81469483d4711b7a00d7b32021-11-14T12:42:35ZUniversal size-dependent nonlinear charge transport in single crystals of the Mott insulator Ca2RuO410.1038/s41535-021-00394-72397-4648https://doaj.org/article/9801d00d5a81469483d4711b7a00d7b32021-11-01T00:00:00Zhttps://doi.org/10.1038/s41535-021-00394-7https://doaj.org/toc/2397-4648Abstract The surprisingly low current density required for inducing the insulator to metal transition has made Ca2RuO4 an attractive candidate material for developing Mott-based electronics devices. The mechanism driving the resistive switching, however, remains a controversial topic in the field of strongly correlated electron systems. Here we probe an uncovered region of phase space by studying high-purity Ca2RuO4 single crystals, using the sample size as principal tuning parameter. Upon reducing the crystal size, we find a four orders of magnitude increase in the current density required for driving Ca2RuO4 out of the insulating state into a non-equilibrium phase which is the precursor to the fully metallic phase. By integrating a microscopic platinum thermometer and performing thermal simulations, we gain insight into the local temperature during simultaneous application of current and establish that the size dependence is not a result of Joule heating. The findings suggest an inhomogeneous current distribution in the nominally homogeneous crystal. Our study calls for a reexamination of the interplay between sample size, charge current, and temperature in driving Ca2RuO4 towards the Mott insulator to metal transition.G. AvalloneR. FerminK. LahabiV. GranataR. FittipaldiC. CirilloC. AttanasioA. VecchioneJ. AartsNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 6, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197 G. Avallone R. Fermin K. Lahabi V. Granata R. Fittipaldi C. Cirillo C. Attanasio A. Vecchione J. Aarts Universal size-dependent nonlinear charge transport in single crystals of the Mott insulator Ca2RuO4
description	Abstract The surprisingly low current density required for inducing the insulator to metal transition has made Ca2RuO4 an attractive candidate material for developing Mott-based electronics devices. The mechanism driving the resistive switching, however, remains a controversial topic in the field of strongly correlated electron systems. Here we probe an uncovered region of phase space by studying high-purity Ca2RuO4 single crystals, using the sample size as principal tuning parameter. Upon reducing the crystal size, we find a four orders of magnitude increase in the current density required for driving Ca2RuO4 out of the insulating state into a non-equilibrium phase which is the precursor to the fully metallic phase. By integrating a microscopic platinum thermometer and performing thermal simulations, we gain insight into the local temperature during simultaneous application of current and establish that the size dependence is not a result of Joule heating. The findings suggest an inhomogeneous current distribution in the nominally homogeneous crystal. Our study calls for a reexamination of the interplay between sample size, charge current, and temperature in driving Ca2RuO4 towards the Mott insulator to metal transition.
format	article
author	G. Avallone R. Fermin K. Lahabi V. Granata R. Fittipaldi C. Cirillo C. Attanasio A. Vecchione J. Aarts
author_facet	G. Avallone R. Fermin K. Lahabi V. Granata R. Fittipaldi C. Cirillo C. Attanasio A. Vecchione J. Aarts
author_sort	G. Avallone
title	Universal size-dependent nonlinear charge transport in single crystals of the Mott insulator Ca2RuO4
title_short	Universal size-dependent nonlinear charge transport in single crystals of the Mott insulator Ca2RuO4
title_full	Universal size-dependent nonlinear charge transport in single crystals of the Mott insulator Ca2RuO4
title_fullStr	Universal size-dependent nonlinear charge transport in single crystals of the Mott insulator Ca2RuO4
title_full_unstemmed	Universal size-dependent nonlinear charge transport in single crystals of the Mott insulator Ca2RuO4
title_sort	universal size-dependent nonlinear charge transport in single crystals of the mott insulator ca2ruo4
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/9801d00d5a81469483d4711b7a00d7b3
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Universal size-dependent nonlinear charge transport in single crystals of the Mott insulator Ca2RuO4

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