材料科学
谱线
凝聚态物理
莫特绝缘子
带隙
电荷(物理)
光导率
物理
晶体结构
结晶学
金属
铁磁性
化学
粒子物理学
天文
冶金
作者
Jobu Matsuno,Y. Okimoto,Masato Kawasaki,Y. Tokura
标识
DOI:10.1103/physrevlett.95.176404
摘要
We have systematically synthesized single-crystalline thin films of layered perovskites ${\mathrm{Sr}}_{2}M{\mathrm{O}}_{4}$ ($M=\mathrm{Ti}$, V, Cr, Mn, and Co) which cannot be obtained in a form of bulk crystal apart from $M=\mathrm{Mn}$. The two-dimensional electronic structure of these ${M}^{4+}$ oxides, ranging from a correlated insulator to a ferromagnetic metal, has been investigated by using their optical conductivity spectra with polarizations $E\ensuremath{\perp}c$ and $E\ensuremath{\parallel}c$, which reveal systematic variation of the correlated charge gap, Mott-Hubbard gap, or charge-transfer gap. Temperature dependence of the gap-transition spectra is argued in the light of possible spin and/or orbital ordering.
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