Low energy band gap state in compressed needlelike structure of CdSb:Ni
We studied the effect of high pressure on the border of intrinsic conductivity in CdSb doped with 0.5%Ni, the structure of which is needlelike due to spherical extended NiSb inclusions. The bandgap state has been found to be strongly governed by a structural transition in the composite structure. A...
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Veröffentlicht in: | Applied physics letters 2019-12, Vol.115 (25) |
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Sprache: | eng |
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Zusammenfassung: | We studied the effect of high pressure on the border of intrinsic conductivity in CdSb doped with 0.5%Ni, the structure of which is needlelike due to spherical extended NiSb inclusions. The bandgap state has been found to be strongly governed by a structural transition in the composite structure. A pressure-induced phase exhibits an activation behavior only upon heating with a very low energy gap by 0.05 eV at 5.32 GPa, while metallic conductivity appears upon subsequent cooling, which is attributed to the instability of the cadmium antimonide structure. Room-temperature Hall effect measurements confirm that the high-pressure phase is not fully metallized, yielding a hole concentration of 4.08 × 1018 cm−3 at the onset of structural transition and a reduced magnitude by order in this phase. |
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ISSN: | 0003-6951 1077-3118 1077-3118 |
DOI: | 10.1063/1.5129131 |