Electrical resistivity of the Ti4O7 Magneli phase under high pressure

We have measured resistivity as a function of temperature and pressure of Ti4O7 twinned crystals using different contact configurations. Pressures over 4 kbar depress the localization of bipolarons and allow the study of the electrical conduction of the bipolaronic phase down to low temperatures. Fo...

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Detalles Bibliográficos
Publicado: 2003
Materias:
Anisotropy
Crystalline materials
Electric conductivity
Polarons
Pressure effects
Twinning
Anisotropic conduction
Bipolaronic phase
Logarithmic divergence
Magneli phase
Titanium compounds
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14346028_v34_n4_p421_Acha
http://hdl.handle.net/20.500.12110/paper_14346028_v34_n4_p421_Acha
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_14346028_v34_n4_p421_Acha
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spelling paper:paper_14346028_v34_n4_p421_Acha2023-06-08T16:14:34Z Electrical resistivity of the Ti4O7 Magneli phase under high pressure Anisotropy Crystalline materials Electric conductivity Polarons Pressure effects Twinning Anisotropic conduction Bipolaronic phase Logarithmic divergence Magneli phase Titanium compounds We have measured resistivity as a function of temperature and pressure of Ti4O7 twinned crystals using different contact configurations. Pressures over 4 kbar depress the localization of bipolarons and allow the study of the electrical conduction of the bipolaronic phase down to low temperatures. For pressures P > 40 kbar the bipolaron formation transition is suppressed and a nearly pressure independent behavior is obtained for the resistivity. We observed an anisotropic conduction. When current is injected parallel to the principal axis, a metallic conduction with interacting carrier effects is predominant. A superconducting state was not obtained down to 1.2 K, although evidences of the proximity of a quantum critical point were noticed. While when current is injected non-parallel to the crystal's principal axis, we obtained a logarithmic divergence of the resistivity at low temperatures. For this case, our results for the high pressure regime can be interpreted in the framework of interacting carriers (polarons or bipolarons) scattered by Two Level Systems. © EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2003. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14346028_v34_n4_p421_Acha http://hdl.handle.net/20.500.12110/paper_14346028_v34_n4_p421_Acha
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Anisotropy
Crystalline materials
Electric conductivity
Polarons
Pressure effects
Twinning
Anisotropic conduction
Bipolaronic phase
Logarithmic divergence
Magneli phase
Titanium compounds
spellingShingle Anisotropy
Crystalline materials
Electric conductivity
Polarons
Pressure effects
Twinning
Anisotropic conduction
Bipolaronic phase
Logarithmic divergence
Magneli phase
Titanium compounds
Electrical resistivity of the Ti4O7 Magneli phase under high pressure
topic_facet Anisotropy
Crystalline materials
Electric conductivity
Polarons
Pressure effects
Twinning
Anisotropic conduction
Bipolaronic phase
Logarithmic divergence
Magneli phase
Titanium compounds
description We have measured resistivity as a function of temperature and pressure of Ti4O7 twinned crystals using different contact configurations. Pressures over 4 kbar depress the localization of bipolarons and allow the study of the electrical conduction of the bipolaronic phase down to low temperatures. For pressures P > 40 kbar the bipolaron formation transition is suppressed and a nearly pressure independent behavior is obtained for the resistivity. We observed an anisotropic conduction. When current is injected parallel to the principal axis, a metallic conduction with interacting carrier effects is predominant. A superconducting state was not obtained down to 1.2 K, although evidences of the proximity of a quantum critical point were noticed. While when current is injected non-parallel to the crystal's principal axis, we obtained a logarithmic divergence of the resistivity at low temperatures. For this case, our results for the high pressure regime can be interpreted in the framework of interacting carriers (polarons or bipolarons) scattered by Two Level Systems. © EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2003.
title Electrical resistivity of the Ti4O7 Magneli phase under high pressure
title_short Electrical resistivity of the Ti4O7 Magneli phase under high pressure
title_full Electrical resistivity of the Ti4O7 Magneli phase under high pressure
title_fullStr Electrical resistivity of the Ti4O7 Magneli phase under high pressure
title_full_unstemmed Electrical resistivity of the Ti4O7 Magneli phase under high pressure
title_sort electrical resistivity of the ti4o7 magneli phase under high pressure
publishDate 2003
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14346028_v34_n4_p421_Acha
http://hdl.handle.net/20.500.12110/paper_14346028_v34_n4_p421_Acha
_version_ 1768546641922490368

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