Proximity to a critical point driven by electronic entropy in URu2Si2

Abstract The strongly correlated actinide metal URu2Si2 exhibits a mean field-like second order phase transition at T o ≈ 17 K, yet lacks definitive signatures of a broken symmetry. Meanwhile, various experiments have also shown the electronic energy gap to closely resemble that resulting from hybri...

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Autores principales:	Neil Harrison, Satya K. Kushwaha, Mun K. Chan, Marcelo Jaime
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/b7463fb982ce4722896306a765f3e685
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spelling	oai:doaj.org-article:b7463fb982ce4722896306a765f3e6852021-12-02T13:26:20ZProximity to a critical point driven by electronic entropy in URu2Si210.1038/s41535-021-00317-62397-4648https://doaj.org/article/b7463fb982ce4722896306a765f3e6852021-03-01T00:00:00Zhttps://doi.org/10.1038/s41535-021-00317-6https://doaj.org/toc/2397-4648Abstract The strongly correlated actinide metal URu2Si2 exhibits a mean field-like second order phase transition at T o ≈ 17 K, yet lacks definitive signatures of a broken symmetry. Meanwhile, various experiments have also shown the electronic energy gap to closely resemble that resulting from hybridization between conduction electron and 5f-electron states. We argue here, using thermodynamic measurements, that the above seemingly incompatible observations can be jointly understood by way of proximity to an entropy-driven critical point, in which the latent heat of a valence-type electronic instability is quenched by thermal excitations across a gap, driving the transition second order. Salient features of such a transition include a robust gap spanning highly degenerate features in the electronic density of states, that is weakly (if at all) suppressed by temperature on approaching T o, and an elliptical phase boundary in magnetic field and temperature that is Pauli paramagnetically limited at its critical magnetic field.Neil HarrisonSatya K. KushwahaMun K. ChanMarcelo JaimeNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 6, Iss 1, Pp 1-10 (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 Neil Harrison Satya K. Kushwaha Mun K. Chan Marcelo Jaime Proximity to a critical point driven by electronic entropy in URu2Si2
description	Abstract The strongly correlated actinide metal URu2Si2 exhibits a mean field-like second order phase transition at T o ≈ 17 K, yet lacks definitive signatures of a broken symmetry. Meanwhile, various experiments have also shown the electronic energy gap to closely resemble that resulting from hybridization between conduction electron and 5f-electron states. We argue here, using thermodynamic measurements, that the above seemingly incompatible observations can be jointly understood by way of proximity to an entropy-driven critical point, in which the latent heat of a valence-type electronic instability is quenched by thermal excitations across a gap, driving the transition second order. Salient features of such a transition include a robust gap spanning highly degenerate features in the electronic density of states, that is weakly (if at all) suppressed by temperature on approaching T o, and an elliptical phase boundary in magnetic field and temperature that is Pauli paramagnetically limited at its critical magnetic field.
format	article
author	Neil Harrison Satya K. Kushwaha Mun K. Chan Marcelo Jaime
author_facet	Neil Harrison Satya K. Kushwaha Mun K. Chan Marcelo Jaime
author_sort	Neil Harrison
title	Proximity to a critical point driven by electronic entropy in URu2Si2
title_short	Proximity to a critical point driven by electronic entropy in URu2Si2
title_full	Proximity to a critical point driven by electronic entropy in URu2Si2
title_fullStr	Proximity to a critical point driven by electronic entropy in URu2Si2
title_full_unstemmed	Proximity to a critical point driven by electronic entropy in URu2Si2
title_sort	proximity to a critical point driven by electronic entropy in uru2si2
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/b7463fb982ce4722896306a765f3e685
work_keys_str_mv	AT neilharrison proximitytoacriticalpointdrivenbyelectronicentropyinuru2si2 AT satyakkushwaha proximitytoacriticalpointdrivenbyelectronicentropyinuru2si2 AT munkchan proximitytoacriticalpointdrivenbyelectronicentropyinuru2si2 AT marcelojaime proximitytoacriticalpointdrivenbyelectronicentropyinuru2si2
_version_	1718393054195351552

Proximity to a critical point driven by electronic entropy in URu2Si2

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