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Phys. Rev. B 64, 140101 (2001) [4 pages]

Characterization of the metallic phases in BaCo0.9Ni0.1S1.87

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J.-S. Zhou, W. J. Zhu, and J. B. Goodenough
Texas Materials Institute, ETC 9.102, University of Texas, Austin, Texas 78712

Rapid Communication Received 1 March 2001; revised 27 June 2001; published 17 September 2001

The temperature dependence of the resistivity along the c axis and in the a-b plane of layered BaCo0.9Ni0.1S1.87 has been measured on a single crystal under hydrostatic pressures. The monoclinic metallic (LTM) phase stable at T<~150 K is suppressed under a pressure P>1.5 kbar; it has a nearly isotropic conductivity. Pressure induces an insulator-metal (IM) transition at P>10 kbar within the tetragonal phase. A change from a nearly isotropic conduction to a highly anisotropic conduction is associated with the IM transition. Isotropic conduction in the LTM phase is consistent with its crystallographic structure; the IM transition in the tetragonal phase has been interpreted to be due to a high-spin to low-spin transition of Co(II) ions. The resistivity and thermal conductivity of the LTM metallic phase are typical of those of a normal metal.


©2001 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v64/e140101
DOI: 10.1103/PhysRevB.64.140101
PACS: 71.30.+h, 72.80.Ga, 73.21.-b, 71.28.+d

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