Electrolyte Gate-Controlled Kondo Effect in SrTiO3
Electrolyte Gate-Controlled Kondo Effect in SrTiO3
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DOI：
10.1103/physrevlett.107.256601
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发表时间：
2011-12-12
影响因子：
8.6
通讯作者：
Goldhaber-Gordon, D.
中科院分区：
文献类型：
--
作者：
Lee, Menyoung;Williams, J. R.;Goldhaber-Gordon, D.
我们报告低温，高场磁输运测量SrTiO 3门控的离子凝胶电解质。饱和电阻上升和负磁阻信号的出现近藤效应出现较高的施加的栅极电压。通过离子凝胶施加的电场的宽可调谐性，这一观察促进了SrTiO 3中电场效应诱导的2D电子系统作为磁性Ti 3+离子的混合物的解释，即，局域和未成对电子，以及部分填充Ti 3d导带的离域电子。
We report low-temperature, high-field magnetotransport measurements of SrTiO3 gated by an ionic gel electrolyte. A saturating resistance upturn and negative magnetoresistance that signal the emergence of the Kondo effect appear for higher applied gate voltages. This observation, enabled by the wide tunability of the ionic gel-applied electric field, promotes the interpretation of the electric field-effect-induced 2D electron system in SrTiO3 as an admixture of magnetic Ti3+ ions, i.e., localized and unpaired electrons, and delocalized electrons that partially fill the Ti 3d conduction band.