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Hybridization Gap in the Semiconducting Compound SrIr4In2Ge4
Nicholas P Calta1,2, Jino Im3, Lei Fang1,4
1Department of Chemistry, Northwestern University , Evanston, Illinois, United States.
Large single crystals of strontium iridium indium germanium (SrIr4In2Ge4) were synthesized. This new hybridization gap semiconductor exhibits an indirect band gap, suggesting a new family of semiconducting materials.
Area of Science:
- Solid State Chemistry
- Materials Science
- Condensed Matter Physics
Background:
- Hybridization gap materials are of interest for their unique electronic properties.
- Understanding structure-property relationships is crucial for designing new semiconductors.
Purpose of the Study:
- To synthesize large single crystals of SrIr4In2Ge4.
- To characterize the structural and electronic properties of SrIr4In2Ge4.
- To explore its potential as a hybridization gap semiconductor.
Main Methods:
- Synthesis of SrIr4In2Ge4 single crystals using the In flux method.
- X-ray diffraction for crystal structure determination (tetragonal, I4̅2m).
- Optical measurements to determine the experimental band gap.
Main Results:
- Successfully synthesized large single crystals of SrIr4In2Ge4.
- Determined unit cell parameters: a = 6.9004(5) Å, c = 8.7120(9) Å.
- Identified SrIr4In2Ge4 as a hybridization gap semiconductor with an optical band gap of Eg = 0.25(3) eV.
Conclusions:
- SrIr4In2Ge4 belongs to a new family of hybridization gap materials, alongside EuIr4In2Ge4 and Ca3Ir4Ge4.
- The compound exhibits indirect gap, semiconducting behavior.
- This behavior is observed at a valence electron count of 60 per formula unit, analogous to Heusler alloys.
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