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Slater Transition in the Pyrochlore Cd2Os2O7

Published online by Cambridge University Press:  18 March 2011

D. Mandrus,
J. R. Thompson and
L. M. Woods
D. Mandrus
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831; and Department of Physics, The University of Tennessee, Knoxville, TN 37996
J. R. Thompson
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831; and Department of Physics, The University of Tennessee, Knoxville, TN 37996
L. M. Woods
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831; and Department of Physics, The University of Tennessee, Knoxville, TN 37996
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Abstract

Cd2Os2O7 crystallizes in the pyrochlore structure and undergoes a metal-insulator transition (MIT) near 226 K. Here we present resistivity, heat capacity, and magnetization results on Cd2Os2O7. Both single crystal and polycrystalline material were examined. We also present LAPW electronic structure calculations on Cd2Os2O7. We interpret the results in terms of a Slater transition. In this scenario, the MIT is produced by a doubling of the unit cell due to the establishment of antiferromagnetic order. A Slater transition--unlike a Mott transition--is predicted to be continuous, with a semiconducting energy gap opening much like a BCS gap as the material is cooled below T MIT .

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