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Science 13 December 1996:
Vol. 274. no. 5294, pp. 1874 - 1876
DOI: 10.1126/science.274.5294.1874
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Reports

Dynamical Signature of the Mott-Hubbard Transition in Ni(S,Se)2

A. Husmann, D. S. Jin, * Y. V. Zastavker, dagger T. F. Rosenbaum, ddagger X. Yao, J. M. Honig

The transition metal chalcogenide Ni(S,Se)2 is one of the few highly correlated, Mott-Hubbard systems without a strong first-order structural distortion that normally cuts off the critical behavior at the metal-insulator transition. The zero-temperature (T) transition was tuned with pressure, and significant deviations were found near the quantum critical point from the usual T1/2 behavior of the conductivity characteristic of electron-electron interactions in the presence of disorder. The transport data for pressure and temperature below 1 kelvin could be collapsed onto a universal scaling curve.

A. Husmann, D. S. Jin, Y. V. Zastavker, T. F. Rosenbaum, The James Franck Institute and Department of Physics, The University of Chicago, Chicago, IL 60637, USA.
X. Yao and J. M. Honig, Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA.
*   Present address: Joint Institute for Laboratory Astrophysics, University of Colorado, Boulder, CO 80309, USA.

dagger    Present address: Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

ddagger    To whom correspondence should be addressed.

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