Charge-stripe fluctuations in Nd4Ni3O8 as evidenced by optical spectroscopy

Article

关键词: ELECTRONIC-STRUCTURE;    SUPERCONDUCTIVITY;    CONDUCTIVITY;    LA2-XSRXNIO4;    REFLECTANCE;    DEPENDENCE;    SOLIDS;   

DOI  :  10.1103/PhysRevB.103.205120

来源: SCIE

【 摘 要 】

We present an investigation into the optical properties of Nd4Ni3O8 at different temperatures from 300 down to 5 K over a broad frequency range. The optical conductivity at 5 K is decomposed into infrared-active phonons, a far-infrared band alpha, a mid-infrared band beta, and a high-energy absorption edge. By comparing the measured optical conductivity to first-principles calculations and the optical response of other nickelates, we find that Nd4Ni3O8 features evident charge-stripe fluctuations. The beta band is attributed to electronic transitions between the gapped Ni-d(x2-y2) bands due to fluctuating charge stripes, while the high-frequency absorption edge corresponds to the onset of transitions involving other high-energy bands. Furthermore, an analysis of the temperature-dependent optical spectral weight reveals a T-2 law, which is likely to originate from strong correlation effects.

【 授权许可】

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