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Electron Transport Phenomena in NiS2−xSex Single Crystals

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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.

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Authors and Affiliations

  1. Beckman Institute, University of Illinois, 405 N. Mathews Avenue, Urbana, IL, 61801, USA

    X. Yao

  2. Physics Department, University of Houston, Houston, TX, 77204, USA

    T. Hogan

  3. Department of Chemistry, Purdue University, West Lafayette, IN, 47907, USA

    X. Yao & J. M. Honig

  4. School of Materials Engineering, Purdue University, West Lafayette, IN, 47907, USA

    S. Ehrlich & G. Liedlb

  5. Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL, 60208, USA

    T. Hogan & C. Kannewurf

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  1. X. Yao
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  2. S. Ehrlich
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  3. G. Liedlb
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  4. T. Hogan
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  5. C. Kannewurf
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  6. J. M. Honig
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Yao, X., Ehrlich, S., Liedlb, G. et al. Electron Transport Phenomena in NiS2−xSex Single Crystals. MRS Online Proceedings Library 453, 291–303 (1996). https://doi.org/10.1557/PROC-453-291

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  • DOI: https://doi.org/10.1557/PROC-453-291

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