Effect of pressure on the electrical transport and structure of TiOCl

Martin K. Forthaus, Timo Taetz, Angela Möller, and Mohsen M. Abd-Elmeguid
Phys. Rev. B 77, 165121 – Published 15 April 2008

Abstract

We have investigated the effect of pressure on the electrical transport and the structural properties of TiOCl. The temperature dependence of the electrical resistivity up to 24GPa shows no indication of an insulator-to-metal transition. However, the analysis of the pressure dependence of the energy gap (Eg) around 300K reveals first a strong decrease of Eg with increasing pressure, followed by a much weaker decrease of Eg above 13GPa, indicating a change of the electronic structure. The analysis of the pressure dependence of the lattice parameters up to 18GPa reveals an extreme anisotropic and anomalous change of the lattice parameters with increasing pressure. While the lattice parameters b and c smoothly decrease up to the highest pressure, the lattice parameter a remains nearly pressure independent above about 11GPa. It is shown that such anomalous change of the lattice parameters with pressure strongly affects the relative strength of the effective direct and indirect hopping along the b and a axis, respectively, and therefore it is responsible for the observed pressure-induced change of the electronic properties of TiOCl above 13GPa.

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  • Received 18 January 2008

DOI:https://doi.org/10.1103/PhysRevB.77.165121

©2008 American Physical Society

Authors & Affiliations

Martin K. Forthaus1, Timo Taetz2, Angela Möller2, and Mohsen M. Abd-Elmeguid1

  • 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
  • 2Institut für Anorganische Chemie, Universität zu Köln, Greinstrasse 6, D-50939 Köln, Germany

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Issue

Vol. 77, Iss. 16 — 15 April 2008

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