The filled skutterudite CeOs 4 As 12 : A hybridization gap semiconductor
| Autor: | Ryan Baumbach, Zygmunt Henkie, Pei-Chun Ho, Tomasz Cichorek, M. B. Maple, Adam Pietraszko, Ryszard Wawryk, T. A. Sayles |
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| Rok vydání: | 2008 |
| Předmět: |
Materials science
Band gap FOS: Physical sciences 02 engineering and technology engineering.material 01 natural sciences Condensed Matter - Strongly Correlated Electrons Magnetization Electrical resistivity and conductivity Seebeck coefficient 0103 physical sciences Skutterudite 010306 general physics Multidisciplinary Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics business.industry Kondo insulator 021001 nanoscience & nanotechnology Semiconductor Physical Sciences engineering Condensed Matter::Strongly Correlated Electrons 0210 nano-technology Ground state business |
| Zdroj: | Proceedings of the National Academy of Sciences. 105:17307-17311 |
| ISSN: | 1091-6490 0027-8424 |
| DOI: | 10.1073/pnas.0808991105 |
| Popis: | X-ray diffraction, electrical resistivity, magnetization, specific heat, and thermoelectric power measurements are presented for single crystals of the new filled skutterudite compound {\CeOsAs}, which reveal phenomena that are associated with f - electron - conduction electron hybridization. Valence fluctuations or Kondo behavior dominates the physics down to $T$ $\sim$ 135 K. The correlated electron behavior is manifested at low temperatures as a hybridization gap insulating state. The small energy gap $\Delta$$_1$/k$_B$ $\sim$ 73 K, taken from fits to electrical resistivity data, correlates with the evolution of a weakly magnetic or nonmagnetic ground state, which is evident in the magnetization data below a coherence temperature $T$$_{coh}$ $\sim$ 45 K. Additionally, the low temperature electronic specific heat coefficient is small, $\gamma$ $\sim$ 19 mJ/mol K$^2$. Some results for the nonmagnetic analogue compound {\LaOsAs} are also presented for comparison purposes. Comment: Submitted to the Proceedings of the National Academy of Sciences of the United States of America |
| Databáze: | OpenAIRE |
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