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Electron Transport Phenomena in NiS2−xSex Single Crystals

Published online by Cambridge University Press:  15 February 2011

X. Yao ,
S. Ehrlich ,
G. Liedlb ,
T. Hogan ,
C. Kannewurf  and
J. M. Honig
X. Yao
Affiliation:
Beckman Institute, University of Illinois, 405 N. Mathews Avenue, Urbana, IL 61801 Department of Chemistry, Purdue University, West Lafayette, IN 47907
S. Ehrlich
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, IN 47907
G. Liedlb
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, IN 47907
T. Hogan
Affiliation:
University of Houston, Physics Department, Houston TX 77204 Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL 60208.
C. Kannewurf
Affiliation:
Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL 60208.
J. M. Honig
Affiliation:
Department of Chemistry, Purdue University, West Lafayette, IN 47907
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Abstract

Structural studies, electrical resistivity, and Seebeck coefficient measurements are reported in the range 4.2 − 300 K for single crystals of NiS2−xSex (0 ≤ x ≤ 0.71) grown from a Te melt. Over the entire temperature and composition ranges there are no large scale structural changes concomitant to a variety of magnetic ordering phenomena, and to a changeover from insulating to metallic characteristics as x increases. Thus, the evolution in transport characteristics with x can be studied without interference from the lattice; moreover, the electron count is unaffected by substitution of Se for S. The existence of anomalous peaks in resistivity as a function of temperature is attributed to significant electron correlation phenomena which allow the entropy of charge carrier to play a dominant role. The complex temperature dependence of the Seebeck coefficient is attributed to the participation of both electrons and holes in charge transport.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 453: Symposium R – Solid State Chemistry of Inorganic Materials , 1996 , 291
Copyright
Copyright © Materials Research Society 1997

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References

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