Low-temperature dielectric anomaly arising from electronic phase separation at the Mott insulator-metal transition

Abstract Coulomb repulsion among conduction electrons in solids hinders their motion and leads to a rise in resistivity. A regime of electronic phase separation is expected at the first-order phase transition between a correlated metal and a paramagnetic Mott insulator, but remains unexplored experi...

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Autores principales:	A. Pustogow, R. Rösslhuber, Y. Tan, E. Uykur, A. Böhme, M. Wenzel, Y. Saito, A. Löhle, R. Hübner, A. Kawamoto, J. A. Schlueter, V. Dobrosavljević, M. Dressel
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/24e36abeefd84211bb8579f149268ad1
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spelling	oai:doaj.org-article:24e36abeefd84211bb8579f149268ad12021-12-02T14:23:45ZLow-temperature dielectric anomaly arising from electronic phase separation at the Mott insulator-metal transition10.1038/s41535-020-00307-02397-4648https://doaj.org/article/24e36abeefd84211bb8579f149268ad12021-01-01T00:00:00Zhttps://doi.org/10.1038/s41535-020-00307-0https://doaj.org/toc/2397-4648Abstract Coulomb repulsion among conduction electrons in solids hinders their motion and leads to a rise in resistivity. A regime of electronic phase separation is expected at the first-order phase transition between a correlated metal and a paramagnetic Mott insulator, but remains unexplored experimentally as well as theoretically nearby T = 0. We approach this issue by assessing the complex permittivity via dielectric spectroscopy, which provides vivid mapping of the Mott transition and deep insight into its microscopic nature. Our experiments utilizing both physical pressure and chemical substitution consistently reveal a strong enhancement of the quasi-static dielectric constant ε 1 when correlations are tuned through the critical value. All experimental trends are captured by dynamical mean-field theory of the single-band Hubbard model supplemented by percolation theory. Our findings suggest a similar ’dielectric catastrophe’ in many other correlated materials and explain previous observations that were assigned to multiferroicity or ferroelectricity.A. PustogowR. RösslhuberY. TanE. UykurA. BöhmeM. WenzelY. SaitoA. LöhleR. HübnerA. KawamotoJ. A. SchlueterV. DobrosavljevićM. DresselNature 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 A. Pustogow R. Rösslhuber Y. Tan E. Uykur A. Böhme M. Wenzel Y. Saito A. Löhle R. Hübner A. Kawamoto J. A. Schlueter V. Dobrosavljević M. Dressel Low-temperature dielectric anomaly arising from electronic phase separation at the Mott insulator-metal transition
description	Abstract Coulomb repulsion among conduction electrons in solids hinders their motion and leads to a rise in resistivity. A regime of electronic phase separation is expected at the first-order phase transition between a correlated metal and a paramagnetic Mott insulator, but remains unexplored experimentally as well as theoretically nearby T = 0. We approach this issue by assessing the complex permittivity via dielectric spectroscopy, which provides vivid mapping of the Mott transition and deep insight into its microscopic nature. Our experiments utilizing both physical pressure and chemical substitution consistently reveal a strong enhancement of the quasi-static dielectric constant ε 1 when correlations are tuned through the critical value. All experimental trends are captured by dynamical mean-field theory of the single-band Hubbard model supplemented by percolation theory. Our findings suggest a similar ’dielectric catastrophe’ in many other correlated materials and explain previous observations that were assigned to multiferroicity or ferroelectricity.
format	article
author	A. Pustogow R. Rösslhuber Y. Tan E. Uykur A. Böhme M. Wenzel Y. Saito A. Löhle R. Hübner A. Kawamoto J. A. Schlueter V. Dobrosavljević M. Dressel
author_facet	A. Pustogow R. Rösslhuber Y. Tan E. Uykur A. Böhme M. Wenzel Y. Saito A. Löhle R. Hübner A. Kawamoto J. A. Schlueter V. Dobrosavljević M. Dressel
author_sort	A. Pustogow
title	Low-temperature dielectric anomaly arising from electronic phase separation at the Mott insulator-metal transition
title_short	Low-temperature dielectric anomaly arising from electronic phase separation at the Mott insulator-metal transition
title_full	Low-temperature dielectric anomaly arising from electronic phase separation at the Mott insulator-metal transition
title_fullStr	Low-temperature dielectric anomaly arising from electronic phase separation at the Mott insulator-metal transition
title_full_unstemmed	Low-temperature dielectric anomaly arising from electronic phase separation at the Mott insulator-metal transition
title_sort	low-temperature dielectric anomaly arising from electronic phase separation at the mott insulator-metal transition
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/24e36abeefd84211bb8579f149268ad1
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Low-temperature dielectric anomaly arising from electronic phase separation at the Mott insulator-metal transition

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