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Electrical resistivity of the Ti\(\mathsf{_4}\)O\(\mathsf{_7}\) Magneli phase under high pressure

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Abstract.

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.

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Authors and Affiliations

  1. Laboratorio de Bajas Temperaturas, Departamento de Física, FCEyN, Universidad de Buenos Aires, Pabellón I, Ciudad Universitaria, 1428, Buenos Aires, Argentina

    C. Acha & M. Monteverde

  2. CRTBT, CNRS, BP166, 38042, Grenoble Cedex 09, France

    M. Monteverde & M. Núñez-Regueiro

  3. Facultad de Ciencias Experimentales y Técnicas, Universidad San Pablo, 28668, Boadilla del Monte, Spain

    A. Kuhn

  4. Facultad de Ciencias Químicas, Universidad Complutense, 28040, Madrid, Spain

    M. A. Alario Franco

Authors
  1. C. Acha
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  2. M. Monteverde
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  3. M. Núñez-Regueiro
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  4. A. Kuhn
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  5. M. A. Alario Franco
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Corresponding author

Correspondence to C. Acha.

Additional information

Received: 19 June 2003, Published online: 9 September 2003

PACS:

71.10.Ay Fermi-liquid theory and other phenomenological models - 71.30.+h Metal-insulator transitions and other electronic transitions - 72.10.-d Theory of electronic transport; scattering mechanisms

C. Acha: Also fellow of CONICET of Argentina

M. Monteverde: Scholarship from CONICET of Argentina

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Acha, C., Monteverde, M., Núñez-Regueiro, M. et al. Electrical resistivity of the Ti\(\mathsf{_4}\)O\(\mathsf{_7}\) Magneli phase under high pressure. Eur. Phys. J. B 34, 421–428 (2003). https://doi.org/10.1140/epjb/e2003-00240-2

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