Tunable charge carriers and thermoelectricity of single-crystal Ba8Ga16Sn30

Details Tunable charge carriers and thermoelectricity of single-crystal Ba8Ga16Sn30 Tunable charge carriers and thermoelectricity of single-crystal Ba8Ga16Sn30

2005-05-04

arxiv.org/abs/cond-mat/0505095v2

J. Phys. Condens. Matter 18 (2006) 1585-1592.

Physics

Condensed Matter

Strongly Correlated Electrons

Revised version accepted in J. Phys.: Cond. Mat

Scientific paper

10.1088/0953-8984/18/5/011

We have grown single crystals of the type-VIII intermetallic clathrate Ba8Ga16Sn30 from both Sn and Ga flux, evaluated their compositions through electron microprobe analysis and studied their transport properties through measurements on temperature dependent resistivity, thermopower and Hall coefficient. Crystals grown in Sn flux show n-type carriers and those from Ga flux show p-type carriers, whereas all measured compositions remain very close to the stoichiometric 8:16:30 proportion of Ba:Ga:Sn, expected from charge-balance principles. Our results indicate a very high sensitivity of the charge carrier nature and density with respect to the growth conditions, leading to relevant differences in transport properties which point to the importance of tuning this material for optimal thermoelectric performance.

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