Evidence for thermal activation in the glassy dynamics of insulating granular aluminum conductance
| Autor: | J Delahaye, T. Grenet |
|---|---|
| Přispěvatelé: | Magnétisme et Supraconductivité (MagSup ), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]) |
| Rok vydání: | 2017 |
| Předmět: |
Work (thermodynamics)
Materials science Oxide FOS: Physical sciences Field effect chemistry.chemical_element Activation energy 01 natural sciences Condensed Matter::Disordered Systems and Neural Networks 6470P 010305 fluids & plasmas chemistry.chemical_compound Electrical resistance and conductance 0103 physical sciences Thermal General Materials Science [PHYS.COND.CM-DS-NN]Physics [physics]/Condensed Matter [cond-mat]/Disordered Systems and Neural Networks [cond-mat.dis-nn] 010306 general physics 7130+h Conductance Disordered Systems and Neural Networks (cond-mat.dis-nn) Condensed Matter - Disordered Systems and Neural Networks Condensed Matter Physics 7215Rn chemistry Chemical physics Indium numbers: 7280Ng |
| Zdroj: | Journal of Physics: Condensed Matter Journal of Physics: Condensed Matter, IOP Publishing, 2017, 29 (45), pp.455602. ⟨10.1088/1361-648X/aa8b53⟩ |
| ISSN: | 1361-648X 0953-8984 |
| DOI: | 10.1088/1361-648X/aa8b53⟩ |
| Popis: | International audience; Insulating granular aluminum is one of the proto-typical disordered insulators whose low temperature electrical conductance exhibits ubiquitous non-equilibrium phenomena. These include slow responses to temperature or gate voltage changes, characteristic field effect anomalies and ageing phenomena typical of a glass. In this system the influence of temperature on the glassy dynamics has remained elusive, leading to the belief that the slow relaxations essentially proceed via elastic quantum tunneling. A similar situation was met in insulating indium oxide and it was concluded that in high carrier density Anderson insulators, electrons form a quantum glass phase. In this work we experimentally demonstrate that thermal effects do play a role and that the slow dynamics in granular aluminum is subject to thermal activation. We show how its signatures can be revealed and activation energy distributions can be extracted, providing a promising grasp on the nature of the microscopic mechanism at work in glassy Anderson insulators. We explain why some of the experimental protocols previously used in the literature fail to reveal thermal activation in these systems. Our results and analyses call for a reassessment of the emblematic case of indium oxide, and question the existence of a quantum glass in any of the systems studied so far. |
| Databáze: | OpenAIRE |
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