1. The filled skutterudite Ce[Os.sub.4][As.sub.12]: a hybridization gap semiconductor
- Author
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Baumbach, R.E., Ho, P.C., Sayles, T.A., Maple, M.B., Wawryk, R., Cichorek, T., Pietraszko, A., and Henkie, Z.
- Subjects
Minerals -- Properties ,Minerals -- Usage ,Semiconductors -- Properties ,Semiconductors -- Composition ,Crystals -- Properties ,Kondo effect -- Research ,Electric insulators -- Properties ,Science and technology - Abstract
X-ray diffraction, electrical resistivity, magnetization, specific heat, and thermoelectric power measurements are presented for single crystals of the new filled skutterudite compound Ce[Os.sub.4][As.sub.12], which reveal phenomena that are associated with f-electron-conduction electron hybridization. Valence fluctuations or Kondo behavior dominates the physics down to T ~ 135 K. The correlated electron behavior is manifested at low temperatures as a hybridization gapinsulating state. The small energy gap [[DELTA].sub.1]/[k.sub.B] ~ 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.sub.coh] ~ 45 K. Additionally, the low-temperature electronic specific heat coefficient is small, [gamma] ~ 19 mJ/mol [K.sup.2]. Some results for the nonmagnetic analogue compound La[Os.sub.4][As.sub.12] are also presented for comparison purposes. Kondo insulator | rare earth compound
- Published
- 2008