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강상관계 물질 연구단
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Structural investigation of the insulator-metal transition in NiS2-xSex compounds

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Title
Structural investigation of the insulator-metal transition in NiS2-xSex compounds
Author(s)
Garam Han; Sungkyun Choi; Hwanbeom Cho; Byungmin Sohn; Je-Geun Park; Changyoung Kim
Publication Date
2018-09
Journal
PHYSICAL REVIEW B, v.98, no.12, pp.125114 -
Publisher
AMER PHYSICAL SOC
Abstract
We report on a combined measurement of high-resolution x-ray diffraction on powder and Raman scattering on single crystalline NiS2-xSex samples that exhibit the insulator-metal transition with Se doping. Via x rays, an abrupt change in the bond length between Ni and S (Se) ions was observed at the transition temperature, in sharp contrast to the almost constant bond length between chalcogen ions. Raman scattering, a complementary technique with the unique sensitivity to the vibrations of chalcogen bonds, revealed no anomalies in the phonon spectrum, consistent with the x-ray diffraction results. This indicates the important role of the interaction between Ni and S (Se) in the insulator-metal transition. The potential implication of this interpretation is discussed in terms of current theoretical models. © 2018 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/5192
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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