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Low energy band gap state in compressed needlelike structure of CdSb:Ni
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy. Russian Acad Sci, Daghestan Sci Ctr, Amirkhanov Inst Phys, Makhachkala 367003, Russia.
Russian Acad Sci, Daghestan Sci Ctr, Amirkhanov Inst Phys, Makhachkala 367003, Russia.
Belgorod State Univ, Dept Phys, RUS-308015 Belgorod, Russia.
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2019 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 115, no 25, article id 252101Article in journal (Refereed) Published
Abstract [en]

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 x 10(18) cm(-3) at the onset of structural transition and a reduced magnitude by order in this phase.

Place, publisher, year, edition, pages
2019. Vol. 115, no 25, article id 252101
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Condensed Matter Physics
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URN: urn:nbn:se:uu:diva-402619DOI: 10.1063/1.5129131ISI: 000505535900018OAI: oai:DiVA.org:uu-402619DiVA, id: diva2:1386496
Available from: 2020-01-17 Created: 2020-01-17 Last updated: 2020-01-17Bibliographically approved

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