Electrostatic Control of the Evolution from a Superconducting Phase to an Insulating Phase in Ultrathin YBa2CaCu3O7-x Films
Electrostatic Control of the Evolution from a Superconducting Phase to an Insulating Phase in Ultrathin YBa2CaCu3O7-x Films
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DOI：
10.1103/physrevlett.107.027001
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发表时间：
2011-07-07
影响因子：
8.6
通讯作者：
Goldman, A. M.
中科院分区：
文献类型：
--
作者：
Leng, Xiang;Garcia-Barriocanal, Javier;Goldman, A. M.
电输运性质的xYBa_2Cu_3O_（7-x）薄膜已被修改使用双电层晶体管配置采用离子液体。一个明确的演变，从超导体绝缘体观察到名义上7个单位细胞厚的薄膜。使用有限尺寸标度分析，电阻与温度的曲线，R（T），从6到22 K的温度范围内被发现崩溃到一个单一的标度函数，这表明存在一个量子临界点。然而，缩放失败，在最低的温度下，指示超导和绝缘制度之间可能存在一个额外的阶段。
The electrical transport properties of ultrathin YBa2Cu3O7-x films have been modified using an electric double layer transistor configuration employing an ionic liquid. A clear evolution from superconductor to insulator was observed in nominally 7 unit-cell-thick films. Using a finite size scaling analysis, curves of resistance versus temperature, R(T), over the temperature range from 6 to 22 K were found to collapse onto a single scaling function, which suggests the presence of a quantum critical point. However, the scaling fails at the lowest temperatures indicating the possible presence of an additional phase between the superconducting and insulating regimes.