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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todo:paper_14346028_v34_n4_p421_Acha2023-10-03T16:14:31Z Electrical resistivity of the Ti4O7 Magneli phase under high pressure Acha, C. Monteverde, M. Núñez-Regueiro, M. Kuhn, A. Alario Franco, M.A. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_14346028_v34_n4_p421_Acha |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
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R-134 |
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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 Acha, C. Monteverde, M. Núñez-Regueiro, M. Kuhn, A. Alario Franco, M.A. 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. |
| format |
JOUR |
| author |
Acha, C. Monteverde, M. Núñez-Regueiro, M. Kuhn, A. Alario Franco, M.A. |
| author_facet |
Acha, C. Monteverde, M. Núñez-Regueiro, M. Kuhn, A. Alario Franco, M.A. |
| author_sort |
Acha, C. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_14346028_v34_n4_p421_Acha |
| work_keys_str_mv |
AT achac electricalresistivityoftheti4o7magneliphaseunderhighpressure AT monteverdem electricalresistivityoftheti4o7magneliphaseunderhighpressure AT nunezregueirom electricalresistivityoftheti4o7magneliphaseunderhighpressure AT kuhna electricalresistivityoftheti4o7magneliphaseunderhighpressure AT alariofrancoma electricalresistivityoftheti4o7magneliphaseunderhighpressure |
| _version_ |
1782025230795931648 |